John Tyndall: Difference between revisions

John Tyndall
FRS
John Tyndall FRS
Born	2 August 1820; Leighlinbridge, Carlow, Ireland
Died	4 December 1893 (aged 73); Haslemere, Surrey, England
Alma mater	University of Marburg
Known for	Disproving spontaneous generation theory; Tyndall's bar breaker; Tyndall effect; Tyndallization; Capnography; Greenhouse effect; Heat; Respirator; Thermophoresis; Water vapor windows; Coining the term calorescence;
Spouse	Louisa Charlotte Hamilton (m. 1876)
Awards	FRS (1852); Royal Medal (1853); Bakerian Medal (1855, 1861, 1864, 1881); Rumford Medal (1864);
	Scientific career
Fields	Physics; Chemistry
Institutions	Royal Institution; University of Cambridge
Academic advisors	Robert Bunsen; Hermann Knoblauch
Notable students	Mihajlo Pupin
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John Tyndall (/ˈtɪndəl/; 2 August 1820 – 4 December 1893) was an Irish physicist and chemist. His scientific fame arose in the 1850s from his study of diamagnetism. Later he made discoveries in the realms of infrared radiation and the physical properties of air, proving the connection between atmospheric CO₂ and what is now known as the greenhouse effect in 1859.

Tyndall also published more than a dozen science books which brought state-of-the-art 19th century experimental physics to a wide audience. From 1853 to 1887 he was professor of physics at the Royal Institution of Great Britain in London. He was elected as a member to the American Philosophical Society in 1868.^[3]

Early years and education

Tyndall was born in Leighlinbridge, County Carlow, Ireland. His father was a local police constable, descended from Gloucestershire emigrants who settled in southeast Ireland around 1670. Tyndall attended the local schools (Ballinabranna Primary School) in County Carlow until his late teens, and was probably an assistant teacher near the end of his time there. Subjects learned at school notably included technical drawing and mathematics with some applications of those subjects to land surveying. He was hired as a draftsman by the Ordnance Survey of Ireland in his late teens in 1839, and moved to work for the Ordnance Survey for Great Britain in 1842. In the decade of the 1840s, a railway-building boom was in progress, and Tyndall's land surveying experience was valuable and in demand by the railway companies. Between 1844 and 1847, he was lucratively employed in railway construction planning.^[4]^[5]

In 1847, Tyndall opted to become a mathematics and surveying teacher at Queenwood College, a boarding school in Hampshire. Recalling this decision later, he wrote: "the desire to grow intellectually did not forsake me; and, when railway work slackened, I accepted in 1847 a post as master in Queenwood College."^[6] Another recently arrived young teacher at Queenwood was Edward Frankland, who had previously worked as a chemical laboratory assistant for the British Geological Survey. Frankland and Tyndall became good friends. On the strength of Frankland's prior knowledge, they decided to go to Germany to further their education in science. Among other things, Frankland knew that certain German universities were ahead of any in Britain in experimental chemistry and physics. (British universities were still focused on classics and mathematics and not laboratory science.) The pair moved to Germany in summer 1848 and enrolled at the University of Marburg, attracted by the reputation of Robert Bunsen as a teacher. Tyndall studied under Bunsen for two years.^[7] Perhaps more influential for Tyndall at Marburg was Professor Hermann Knoblauch, with whom Tyndall maintained communications by letter for many years afterwards. Tyndall's Marburg dissertation was a mathematical analysis of screw surfaces in 1850 (under Friedrich Ludwig Stegmann). Tyndall stayed in Germany for a further year doing research on magnetism with Knoblauch, including some months' visit at the Berlin laboratory of Knoblauch's main teacher, Heinrich Gustav Magnus. It is clear today that Bunsen and Magnus were among the very best experimental science instructors of the era. Thus, when Tyndall returned to live in England in summer 1851, he probably had as good an education in experimental science as anyone in England.

Early scientific work

Tyndall's early original work in physics was his experiments on magnetism and diamagnetic polarity, on which he worked from 1850 to 1856. His two most influential reports were the first two, co-authored with Knoblauch. One of them was entitled "The magneto-optic properties of crystals, and the relation of magnetism and diamagnetism to molecular arrangement", dated May 1850. The two described an inspired experiment, with an inspired interpretation. These and other magnetic investigations very soon made Tyndall known among the leading scientists of the day.^[8] He was elected a Fellow of the Royal Society in 1852. In his search for a suitable research appointment, he was able to ask the longtime editor of the leading German physics journal (Poggendorff) and other prominent men to write testimonials on his behalf. In 1853, he attained the prestigious appointment of Professor of Natural Philosophy (Physics) at the Royal Institution in London, due in no small part to the esteem his work had garnered from Michael Faraday, the leader of magnetic investigations at the Royal Institution.^[9] About a decade later Tyndall was appointed the successor to the positions held by Michael Faraday at the Royal Institution on Faraday's retirement.

Alpine mountaineering and glaciology

Tyndall visited the Alps mountains in 1856 for scientific reasons and ended up becoming a pioneering mountain climber. He visited the Alps almost every summer from 1856 onward, was a member of the very first mountain-climbing team to reach the top of the Weisshorn (1861), and led one of the early teams to reach the top of the Matterhorn (1868). His is one of the names associated with the "Golden age of alpinism" — the mid-Victorian years when the more difficult of the Alpine peaks were summited for the first time.^[10]

In the Alps, Tyndall studied glaciers, and especially glacier motion. His explanation of glacial flow brought him into dispute with others, particularly James David Forbes. Much of the early scientific work on glacier motion had been done by Forbes, but Forbes at that time did not know of the phenomenon of regelation, which was discovered a little later by Michael Faraday. Regelation played a key role in Tyndall's explanation. Forbes did not see regelation in the same way at all. Complicating their debate, a disagreement arose publicly over who deserved to get investigator credit for what. Articulate friends of Forbes, as well as Forbes himself, thought that Forbes should get the credit for most of the good science, whereas Tyndall thought the credit should be distributed more widely. Tyndall commented: "The idea of semi-fluid motion belongs entirely to Louis Rendu; the proof of the quicker central flow belongs in part to Rendu, but almost wholly to Louis Agassiz and Forbes; the proof of the retardation of the bed belongs to Forbes alone; while the discovery of the locus of the point of maximum motion belongs, I suppose, to me."^[11] When Forbes and Tyndall were in the grave, their disagreement was continued by their respective official biographers. Everyone tried to be reasonable, but agreement was not attained. More disappointingly, aspects of glacier motion remained not understood or not proved.

Numerous landforms and geographical features are named for John Tyndall, including Tyndall Glacier in Chile, Tyndall Glacier in Colorado, Tyndall Glacier in Alaska,^[12] Mount Tyndall in California,^[13] and Mount Tyndall in Tasmania.^[14]

Main scientific work

Work on glaciers alerted Tyndall to the research of Horace Bénédict de Saussure into the heating effect of sunlight, and the concept of Jospeph Fourier, developed by Claude Pouillet and William Hopkins, that heat from the sun penetrates the atmosphere more easily than "obscure heat" (infrared) "terrestrial radiation" from the warmed Earth, causing what we now call the greenhouse effect. In the spring of 1859, Tyndall began research into how thermal radiation, both visible and obscure, affects different gases and aerosols. He developed differential absorption spectroscopy using the electro-magnetic thermopile devised by Macedonio Melloni. Tyndall began intensive experiments on 9 May 1859, at first without significant results, ^[15]^[16] then improved the sensitivity of the apparatus and on 18 May wrote in his journal "Experimented all day; the subject is completely in my hands!" On 26 May he gave the Royal Society a note which described his methods, and stated "With the exception of the celebrated memoir of M. Pouillet on Solar Radiation through the atmosphere, nothing, so far as I am aware, has been published on the transmission of radiant heat through gaseous bodies. We know nothing of the effect even of air upon heat radiated from terrestrial sources."^[17]^[18]

On 10 June, he demonstrated the research in a Royal Society lecture, noting that coal gas and ether strongly absorbed (infrared) radiant heat, and his experimental confirmation of the (greenhouse effect) concept; that solar heat crosses an atmosphere, but "when the heat is absorbed by the planet, it is so changed in quality that the rays emanating from the planet cannot get with the same freedom back into space. Thus the atmosphere admits of the entrance of solar heat; but checks its exit, and the result is a tendency to accumulate heat at the surface of the planet."^[16]^[19]

Tyndall's studies of the action of radiant energy on the constituents of air led him onto several lines of inquiry, and his original research results included the following:

Tyndall explained the heat in the Earth's atmosphere in terms of the capacities of the various gases in the air to absorb radiant heat, in the form of infrared radiation. His measuring device, which used thermopile technology, is an early landmark in the history of absorption spectroscopy of gases.^[20] He was the first to correctly measure the relative infrared absorptive powers of the gases nitrogen, oxygen, water vapour, carbon dioxide, ozone, methane, and other trace gases and vapours. He concluded that water vapour is the strongest absorber of radiant heat in the atmosphere and is the principal gas controlling air temperature. Absorption by the other gases is not negligible but relatively small. Prior to Tyndall it was widely surmised that the Earth's atmosphere warms the surface in what was later called a greenhouse effect, but he was the first to prove it. The proof was that water vapour strongly absorbed infrared radiation.^[21]^[22] Three years earlier, in 1856, the American scientist Eunice Newton Foote had announced experiments demonstrating that water vapour and carbon dioxide absorb heat from solar radiation, but she did not differentiate the effects of infrared.^[17]^[23] Relatedly, Tyndall in 1860 was first to demonstrate and quantify that visually transparent gases are infrared emitters.^[24]
He devised demonstrations that advanced the question of how radiant heat is absorbed and emitted at the molecular level. He appears to be the first person to have demonstrated experimentally that emission of heat in chemical reactions has its physical origination within the newly created molecules (1864).^[25] He produced instructive demonstrations involving the incandescent conversion of infrared into visible light at the molecular level, which he called calorescence (1865), in which he used materials that are transparent to infrared and opaque to visible light or vice versa.^[26] He usually referred to infrared as "radiant heat", and sometimes as "ultra-red undulations", as the word "infrared" did not start coming into use until the 1880s. His main reports of the 1860s were republished as a 450-page collection in 1872 under the title Contributions to Molecular Physics in the Domain of Radiant Heat.
In the investigations on radiant heat in air it had been necessary to use air from which all traces of floating dust and other particulates had been removed.^[27] A very sensitive way to detect particulates is to bathe the air with intense light. The scattering of light by particulate impurities in air and other gases, and in liquids, is known today as the Tyndall effect or Tyndall scattering.^[28] In studying this scattering during the late 1860s Tyndall was a beneficiary of recent improvements in electric-powered lights. He also had the use of good light concentrators. He developed the nephelometer and similar instruments that show properties of aerosols and colloids through concentrated light beams against a dark background and are based on exploiting the Tyndall effect. (When combined with microscopes, the result is the ultramicroscope, which was developed later by others).
He was the first to observe and report the phenomenon of thermophoresis in aerosols. He spotted it surrounding hot objects while investigating the Tyndall effect with focused lightbeams in a dark room. He devised a better way to demonstrate it, and then simply reported it (1870), without investigating the physics of it in depth.^[29]
In radiant-heat experiments that called for much laboratory expertise in the early 1860s, he showed for a variety of readily vaporisable liquids that, molecule for molecule, the vapour form and the liquid form have essentially the same power to absorb radiant heat.^[30] (In modern experiments using narrow-band spectra, some small differences are found that Tyndall's equipment was unable to get at; see e.g. absorption spectrum of H₂O).
He consolidated and enhanced the results of Paul-Quentin Desains, James D. Forbes, Hermann Knoblauch and others demonstrating that the principal properties of visible light can be reproduced for radiant heat – namely reflection, refraction, diffraction, polarisation, depolarisation, double refraction, and rotation in a magnetic field.^[31]
Using his expertise about radiant heat absorption by gases, he invented a system for measuring the amount of carbon dioxide in a sample of exhaled human breath (1862, 1864). The basics of Tyndall's system is in daily use in hospitals today for monitoring patients under anaesthesia.^[32] (See capnometry.)
When studying the absorption of radiant heat by ozone, he came up with a demonstration that helped confirm or reaffirm that ozone is an oxygen cluster (1862).^[33]

In the lab he came up with the following simple way to obtain "optically pure" air, i.e. air that has no visible signs of particulate matter. He built a square wooden box with a couple of glass windows on it. Before closing the box, he coated the inside walls and floor of the box with glycerin, which is a sticky syrup. He found that after a few days' wait the air inside the box was entirely particulate-free when examined with strong light beams through the glass windows. The various floating-matter particulates had all ended up getting stuck to the walls or settling on the sticky floor.^[34] Now, in the optically pure air there were no signs of any "germs", i.e. no signs of floating micro-organisms. Tyndall sterilised some meat-broths by simply boiling them, and then compared what happened when he let these meat-broths sit in the optically pure air, and in ordinary air. The broths sitting in the optically pure air remained "sweet" (as he said) to smell and taste after many months of sitting, while the ones in ordinary air started to become putrid after a few days. This demonstration extended Louis Pasteur's earlier demonstrations that the presence of micro-organisms is a precondition for biomass decomposition. However, the next year (1876) Tyndall failed to consistently reproduce the result. Some of his supposedly heat-sterilized broths rotted in the optically pure air. From this Tyndall was led to find viable bacterial spores (endospores) in supposedly heat-sterilized broths. He discovered the broths had been contaminated with dry bacterial spores from hay in the lab. All bacteria are killed by simple boiling, except that bacteria have a spore form that can survive boiling, he correctly contended, citing research by Ferdinand Cohn. Tyndall found a way to eradicate the bacterial spores that came to be known as "Tyndallization". Tyndallization historically was the earliest known effective way to destroy bacterial spores. At the time, it affirmed the "germ theory" against a number of critics whose experimental results had been defective from the same cause. During the mid-1870s Pasteur and Tyndall were in frequent communication.^[35]^[36]

Invented a better fireman's respirator, a hood that filtered smoke and noxious gas from air (1871, 1874).^[37]
In the late 1860s and early 1870s he wrote an introductory book about sound propagation in air, and was a participant in a large-scale British project to develop a better foghorn. In laboratory demonstrations motivated by foghorn issues, Tyndall established that sound is partially reflected (i.e. partially bounced back like an echo) at the location where an air mass of one temperature meets another air mass of a different temperature; and more generally when a body of air contains two or more air masses of different densities or temperatures, the sound travels poorly because of reflections occurring at the interfaces between the air masses, and very poorly when many such interfaces are present. (He then argued, though inconclusively, that this is the usual main reason why the same distant sound, e.g. foghorn, can be heard stronger or fainter on different days or at different times of day.)^[38]

An index of 19th-century scientific research journals has John Tyndall as the author of more than 147 papers in science research journals, with practically all of them dated between 1850 and 1884, which is an average of more than four papers a year over that 35-year period.^[39]

In his lectures at the Royal Institution Tyndall put a great value on, and was talented at producing, lively, visible demonstrations of physics concepts.^[40] In one lecture, Tyndall demonstrated the propagation of light down through a stream of falling water via total internal reflection of the light. It was referred to as the "light fountain". It is historically significant today because it demonstrates the scientific foundation for modern fibre optic technology. During second half of the 20th century Tyndall was usually credited with being the first to make this demonstration. However, Jean-Daniel Colladon published a report of it in Comptes Rendus in 1842, and there's some suggestive evidence that Tyndall's knowledge of it came ultimately from Colladon and no evidence that Tyndall claimed to have originated it himself.^[41]

Molecular physics of radiant heat

Tyndall was an experimenter and laboratory apparatus builder, not an abstract model builder. But in his experiments on radiation and the heat-absorptive power of gases, he had an underlying agenda to understand the physics of molecules. Tyndall said in 1879: "During nine years of labour on the subject of radiation [in the 1860s], heat and light were handled throughout by me, not as ends, but as instruments by the aid of which the mind might perchance lay hold upon the ultimate particles of matter."^[42] This agenda is explicit in the title he picked for his 1872 book Contributions to Molecular Physics in the Domain of Radiant Heat. It is present less explicitly in the spirit of his widely read 1863 book Heat Considered as a Mode of Motion. Besides heat he also saw magnetism and sound propagation as reducible to molecular behaviours. Invisible molecular behaviours were the ultimate basis of all physical activity. With this mindset, and his experiments, he outlined an account whereby differing types of molecules have differing absorptions of infrared radiation because their molecular structures give them differing oscillating resonances. He'd gotten into the oscillating resonances idea because he'd seen that any one type of molecule has differing absorptions at differing radiant frequencies, and he was entirely persuaded that the only difference between one frequency and another is the frequency.^[43] He'd also seen that the absorption behaviour of molecules is quite different from that of the atoms composing the molecules. For example, the gas nitric oxide (NO) absorbed more than a thousand times more infrared radiation than either nitrogen (N₂) or oxygen (O₂).^[44] He'd also seen in several kinds of experiments that – no matter whether a gas is a weak absorber of broad-spectrum radiant heat – any gas will strongly absorb the radiant heat coming from a separate body of the same type of gas.^[25] That demonstrated a kinship between the molecular mechanisms of absorption and emission. Such a kinship was also in evidence in experiments by Balfour Stewart and others, cited and extended by Tyndall, that showed with respect to broad-spectrum radiant heat that molecules that are weak absorbers are weak emitters and strong absorbers are strong emitters.^[24] (For example, rock-salt is an exceptionally poor absorber of heat via radiation, and a good absorber of heat via conduction. When a plate of rock-salt is heated via conduction and let stand on an insulator, it takes an exceptionally long time to cool down; i.e., it's a poor emitter of infrared.) The kinship between absorption and emission was also consistent with some generic or abstract features of resonators.^[45] The chemical decomposition of molecules by lightwaves (photochemical effect) convinced Tyndall that the resonator could not be the molecule as a whole unit; it had to be some substructure, because otherwise the photochemical effect would be impossible.^[46] But he was without testable ideas as to the form of this substructure, and did not partake in speculation in print. His promotion of the molecular mindset, and his efforts to experimentally expose what molecules are, has been discussed by one historian under the title "John Tyndall, The Rhetorician of Molecularity".^[47]

Educator

Besides being a scientist, John Tyndall was a science teacher and evangelist for the cause of science. He spent a significant amount of his time disseminating science to the general public. He gave hundreds of public lectures to non-specialist audiences at the Royal Institution in London.^[48] When he went on a public lecture tour in the US in 1872, large crowds of non-scientists paid fees to hear him lecture about the nature of light.^[49] A typical statement of Tyndall's reputation at the time is this from a London publication in 1878: "Following the precedent set by Faraday, Professor Tyndall has succeeded not only in original investigation and in teaching science soundly and accurately, but in making it attractive.... When he lectures at the Royal Institution the theatre is crowded."^[50] Tyndall said of the occupation of teacher "I do not know a higher, nobler, and more blessed calling."^[51] His greatest audience was gained ultimately through his books, most of which were not written for experts or specialists. He published more than a dozen science books.^[52] From the mid-1860s on, he was one of the world's most famous living physicists, due firstly to his skill and industry as a tutorialist. Most of his books were translated into German^[53] and French^[54] with his main tutorials staying in print in those languages for decades.

As an indicator of his teaching attitude, here are his concluding remarks to the reader at the end of a 200-page tutorial book for a "youthful audience", The Forms of Water (1872): "Here, my friend, our labours close. It has been a true pleasure to me to have you at my side so long. In the sweat of our brows we have often reached the heights where our work lay, but you have been steadfast and industrious throughout, using in all possible cases your own muscles instead of relying upon mine. Here and there I have stretched an arm and helped you to a ledge, but the work of climbing has been almost exclusively your own. It is thus that I should like to teach you all things; showing you the way to profitable exertion, but leaving the exertion to you.... Our task seems plain enough, but you and I know how often we have had to wrangle resolutely with the facts to bring out their meaning. The work, however, is now done, and you are master of a fragment of that sure and certain knowledge which is founded on the faithful study of nature.... Here then we part. And should we not meet again, the memory of these days will still unite us. Give me your hand. Good bye."^[55]

As another indicator, here is the opening paragraph of his 350-page tutorial entitled Sound (1867): "In the following pages I have tried to render the science of acoustics interesting to all intelligent persons, including those who do not possess any special scientific culture. The subject is treated experimentally throughout, and I have endeavoured so to place each experiment before the reader that he should realise it as an actual operation." In the preface to the 3rd edition of this book, he reports that earlier editions were translated into Chinese at the expense of the Chinese government and translated into German under the supervision of Hermann von Helmholtz (a big name in the science of acoustics).^[56] His first published tutorial, which was about glaciers (1860), similarly states: "The work is written with a desire to interest intelligent persons who may not possess any special scientific culture."

His most widely praised tutorial, and probably his biggest seller, was the 550-page "Heat: a Mode of Motion" (1863; updated editions until 1880). It was in print for at least 50 years,^[57] and is in print today. Its primary feature is, as James Clerk Maxwell said in 1871, "the doctrines of the science [of heat] are forcibly impressed on the mind by well-chosen illustrative experiments."^[58]

Tyndall's three longest tutorials, namely Heat (1863), Sound (1867), and Light (1873), represented state-of-the-art experimental physics at the time they were written. Much of their contents were recent major innovations in the understanding of their respective subjects, which Tyndall was the first writer to present to a wider audience. One caveat is called for about the meaning of "state of the art". The books were devoted to laboratory science and they avoided mathematics. In particular, they contain absolutely no infinitesimal calculus. Mathematical modelling using infinitesimal calculus, especially differential equations, was a component of the state-of-the-art understanding of heat, light and sound at the time.

Demarcation of science from religion

The majority of the progressive and innovative British physicists of Tyndall's generation were conservative and orthodox on matters of religion. That includes for example James Joule, Balfour Stewart, James Clerk Maxwell, George Gabriel Stokes and Lord Kelvin – all names investigating heat or light contemporaneously with Tyndall. These conservatives believed, and sought to strengthen the basis for believing, that religion and science were consistent and harmonious with each other. Tyndall, however, was a member of a club that vocally supported Charles Darwin's theory of evolution and sought to strengthen the barrier, or separation, between religion and science. The most prominent member of this club was the anatomist Thomas Henry Huxley. Tyndall first met Huxley in 1851 and the two had a lifelong friendship. Chemist Edward Frankland and mathematician Thomas Archer Hirst, both of whom Tyndall had known since before going to university in Germany, were members too. Others included the social philosopher Herbert Spencer.

Though not nearly so prominent as Huxley in controversy over philosophical problems, Tyndall played his part in communicating to the educated public what he thought were the virtues of having a clear separation between science (knowledge & rationality) and religion (faith & spirituality).^[59] As the elected president of the British Association for the Advancement of Science in 1874, he gave a long keynote speech at the Association's annual meeting held that year in Belfast. The speech gave a favourable account of the history of evolutionary theories, mentioning Darwin's name favourably more than 20 times, and concluded by asserting that religious sentiment should not be permitted to "intrude on the region of knowledge, over which it holds no command". This was a hot topic. The newspapers carried the report of it on their front pages – in Britain, Ireland & North America, even the European Continent – and many critiques of it appeared soon after. The attention and scrutiny increased the friends of the evolutionists' philosophical position, and brought it closer to mainstream ascendancy.^[60]

In Rome in 1864, Pope Pius IX in his Syllabus of Errors decreed that it was an error that "reason is the ultimate standard by which man can and ought to arrive at knowledge" and an error that "divine revelation is imperfect" in the Bible – and anyone maintaining those errors was to be "anathematized" – and in 1888 decreed as follows: "The fundamental doctrine of rationalism is the supremacy of the human reason, which, refusing due submission to the divine and eternal reason, proclaims its own independence... A doctrine of such character is most hurtful both to individuals and to the State... It follows that it is quite unlawful to demand, to defend, or to grant, unconditional [or promiscuous] freedom of thought, speech, writing, or religion."^[61] Those principles and Tyndall's principles were profound enemies. Luckily for Tyndall he didn't need to get into a contest with them in Britain. Even in Italy, Huxley and Darwin were awarded honorary medals and most of the Italian governing class was hostile to the papacy.^[62] But in Ireland during Tyndall's lifetime the majority of the population grew increasingly doctrinaire and vigorous in its Roman Catholicism and also grew stronger politically. Between 1886 and 1893, Tyndall was active in the debate in England about whether to give the Catholics of Ireland more freedom to go their own way. Like the great majority of Irish-born scientists of the 19th century he opposed the Irish Home Rule Movement. He had ardent views about it, which were published in newspapers and pamphlets.^[63] For example, in an opinion piece in The Times on 27 December 1890 he saw priests and Catholicism as "the heart and soul of this movement" and wrote that placing the non-Catholic minority under the dominion of "the priestly horde" would be "an unspeakable crime".^[64] He tried unsuccessfully to get the UK's premier scientific society to denounce the Irish Home Rule proposal as contrary to the interests of science.^[65]

In several essays included in his book Fragments of Science for Unscientific People, Tyndall attempted to dissuade people from believing in the potential effectiveness of prayers. At the same time, though, he was not broadly anti-religious.^[66]^[67]

Many of his readers interpret Tyndall to be a confirmed agnostic,^[68]^[69]^[70]^[71]^[72]^[73]^[74] though he never explicitly declared himself to be so.^[66]^[67] The following statement from Tyndall is an example of Tyndall's agnostic mindset, made in 1867, and reiterated in 1878: "The phenomena of matter and force come within our intellectual range... but behind, and above, and around us the real mystery of the universe lies unsolved, and, as far as we are concerned, is incapable of solution.... Let us lower our heads, and acknowledge our ignorance, priest and philosopher, one and all."^[66]

Private life

Tyndall did not marry until age 55. His bride, Louisa Hamilton, was the 30-year-old daughter of a member of parliament (Lord Claud Hamilton, M.P.). The following year, 1877, they built a summer chalet at Belalp in the Swiss Alps. Before getting married Tyndall had been living for many years in an upstairs apartment at the Royal Institution and continued living there after marriage until 1885 when he and Louisa moved to a house near Haslemere 45 miles southwest of London. The marriage was a happy one and without children. He retired from the Royal Institution at age 66 having complaints of ill health.^{[citation needed]}

Tyndall became financially well-off from sales of his popular books and fees from his lectures (but there is no evidence that he owned commercial patents). For many years he got non-trivial payments for being a part-time scientific advisor to a couple of quasi-governmental agencies and partly donated the payments to charity. His successful lecture tour of the United States in 1872 netted him a substantial amount of dollars, all of which he promptly donated to a trustee for fostering science in America.^[75] Late in life his money donations went most visibly to the Irish Unionist political cause.^[76] When he died, his wealth was £22,122.^[77] For comparison's sake, the income of a police constable in London was about £80 per year at the time.^[78]

Death

The Swiss memorial to John Tyndall, with the Aletsch Glacier in the background

In his last years Tyndall often took chloral hydrate to treat his insomnia. When bedridden and ailing, he died from an accidental overdose^[79] of this drug in 1893 at the age of 73, and was buried at Haslemere.^[80] The overdose was administered by his wife Louisa. "My darling," said Tyndall when he realized what had happened, "you have killed your John."^[81]

Afterwards, Tyndall's wife took possession of his papers and assigned herself supervisor of an official biography of him. She procrastinated on the project, however, and it was still unfinished when she died in 1940 aged 95.^[82] The book eventually appeared in 1945, written by A. S. Eve and C. H. Creasey, whom Louisa Tyndall had authorised shortly before her death.

John Tyndall is commemorated by a memorial (the Tyndalldenkmal) erected at an elevation of 2,340 metres (7,680 ft) on the mountain slopes above the village of Belalp, where he had his holiday home, and in sight of the Aletsch Glacier, which he had studied.^[83]

John Tyndall's books

Tyndall, J. (1860), The glaciers of the Alps, Being a narrative of excursions and ascents, an account of the origin and phenomena of glaciers and an exposition of the physical principles to which they are related, (1861 edition) Ticknor and Fields, Boston
Tyndall, J. (1862), Mountaineering in 1861. A vacation tour, Longman, Green, Longman, and Roberts, London
Tyndall, J. (1865), On Radiation: One Lecture (40 pages) ^[84]
Tyndall, J. (1868), Heat : A mode of motion, (1869 edition) D. Appleton, New York
Tyndall, J. (1869), Natural Philosophy in Easy Lessons (180 pages) (a physics book intended for use in secondary schools)
Tyndall, J. (1870), Faraday as a discoverer, Longmans, Green, London
Tyndall, J. (1870), Three Scientific Addresses by Prof. John Tyndall (75 pages) ^[85]
Tyndall, J. (1870), Notes of a Course of Nine Lectures on Light (80 pages)
Tyndall, J. (1870), Notes of a Course of Seven Lectures on Electrical Phenomena and Theories (50 pages)
Tyndall, J. (1870), Researches on diamagnetism and magne-crystallic action: including the question of diamagnetic polarity, (a compilation of 1850s research reports), Longmans, Green, London
Tyndall, J. (1871), Hours of exercise in the Alps, Longmans, Green, and Co., London
Tyndall, J. (1871), Fragments of Science: A Series of Detached Essays, Lectures, and Reviews, (1872 edition), Longmans, Green, London
Tyndall, J. (1872), Contributions to Molecular Physics in the Domain of Radiant Heat, (a compilation of 1860s research reports), (1873 edition), D. Appleton and Company, New York
Tyndall, J. (1873), The forms of water in clouds & rivers, ice & glaciers, H. S. King & Co., London
Tyndall, J. (1873), Six Lectures on Light (290 pages)
Tyndall, J. (1876), Lessons in Electricity at the Royal Institution (100 pages), (intended for secondary school students)
Tyndall, J. (1878), Sound; delivered in eight lectures, (1969 edition), Greenwood Press, New York
Tyndall, J. (1882), Essays on the floating matter of the air, in relation to putrefaction and infection, D. Appleton, New York
Tyndall, J. (1887), Light and electricity: notes of two courses of lectures before the Royal Institution of Great Britain, D. Appleton and Company, New York
Tyndall, J. (1892), New Fragments (miscellaneous essays for a broad audience), D. Appleton, New York

Notes

^ "Музей истории телефона - История телефона".
^ Pupin, Michael. From immigrant to inventor. — New York, London: Charles Scribner's Sons, 1949. — p. 200. — 396 p.
^ "APS Member History". search.amphilsoc.org. Retrieved 26 April 2021.
^ When working for the government's land surveying agency in Lancashire, Tyndall was one of a number of employees who signed a petition calling for higher wages plus some other changes in working conditions. In November 1843, all of the signatories to the petition were dismissed from their jobs. In August 1844, Tyndall was hired by a railway surveying company in Lancashire at almost four times higher pay than the government had been paying him. D. Thompson (1957). "John Tyndall: A study in vocational enterprise". The Vocational Aspect of Education. 9 (18): 38–48. doi:10.1080/03057875780000061. Also Eve, A.S. & Creasey, C.H. (1945). Life and Work of John Tyndall.
^ Tyndall was the chief surveyor for the proposed railway line from Halifax to Keighley in 1846, according to Thomas Archer Hirst, who worked under Tyndall at the same engineering firm at the time – Ref. Tyndall described himself as the "principal assistant" at the firm – "Tyndall's Obituary for Hirst". Proceedings of the Royal Society of London. 52: xiv–xv. 1893.
^ Tyndall gave detailed recollections about his life in the 1840s in "Address Delivered at the Birkbeck Institution on October 22, 1884", which is published as a chapter in his New Fragments essays (1892).
^ Tyndall studied under Bunsen from 1848 to 1850. Thirty-five years later, he praised Bunsen for explaining chemistry and physics in "the language of experiment" and said "I still look back on Bunsen as the nearest approach to my ideal of a university teacher." New Fragments.
^ Tyndall's main 1850s research reports on diamagnetism were later republished as a collection, which is available at Archive.org. In the preface to the collection Tyndall writes about the work's historical context. William T. Jeans' biography of Tyndall (pp. 22–34) also goes into the historical context of Tyndall's diamagnetic investigations.
^ Michael Faraday advocated for Tyndall's appointment at the Royal Institution. As part of that, in a letter to the managers of the Royal Institution on 23 May 1853, Faraday praised Tyndall's abilities as a lecturer: "I have heard him on two or three occasions, when his manner of expounding nature by discourse and experiment was in my judgement excellent". Source: Emily Hankin (2008), "John Tyndall's Lecture Courses at the Royal Institution and their Reception" Archived 4 March 2016 at the Wayback Machine.
^ According to the account in Tyndall's book The Glaciers of the Alps (1860), Tyndall in 1858 reached the summit of Monte Rosa solo carrying only a ham sandwich for sustenance. The first ascent of Monte Rosa had taken place only in 1855. He had already reached the summit of Monte Rosa in a guided group on 10 August 1858 but he made an unplanned second ascent solo on 17 August 1858 after breakfast: "the waiter then provided me with a ham sandwich, and, with my scrip thus frugally furnished, I thought the heights of Monte Rosa might be won...." (continued at pages 151–157 of Glaciers of the Alps). Besides Tyndall's own books, information about Tyndall as a mountaineer is available at A History of Mountaineering in the Alps by Claire Eliane Engel and The Victorian Mountaineers by Ronald Clark.
^ That quotation from Tyndall appears in Chisholm (1911). For Forbes' view of the issue see "Appendix A" (plus Chapter XV) of Life and Letters of James David Forbes.
^ "Geographic Names Information System". edits.nationalmap.gov. Retrieved 28 July 2022.
^ Brewer, William H. (1873). "Discovery of Mount Tyndall". The Popular Science Monthly. 2: 739–741.
^ Haast, Julius (1864). "Notes on the Mountains and Glaciers of the Canterbury Province, New Zealand". Journal of the Royal Geographical Society of London. 34: 87–96. doi:10.2307/1798467. JSTOR 1798467.
^ Tyndall, John (31 December 1861). "I. The Bakerian Lecture.—On the Absorption and Radiation of Heat by Gases and Vapours, and on the Physical Connexion of Radiation, Absorption, and Conduction". Philosophical Transactions of the Royal Society of London. 151. The Royal Society: 1–36. doi:10.1098/rstl.1861.0001. ISSN 0261-0523. Received January 10, Read February 7, 1861
^ ^a ^b Jackson, Roland. "John Tyndall: founder of climate science?". Climate Lab Book. Retrieved 12 March 2020.
^ ^a ^b Jackson, Roland (5 March 2020). "Who discovered the greenhouse effect?". The Royal Institution: Science Lives Here. Retrieved 12 March 2020. Note; it is now appreciated that in 1856 Eunice Foote had published experiments on how the sun's rays heated gases, giving evidence that CO₂ and water vapour absorbed heat, and speculated that changes in their proportions could affect climate, but she did not differentiate the effects of infrared heat.
^ Tyndall, John (31 December 1860). "VII. Note on the transmission of radiant heat through gaseous bodies". Proceedings of the Royal Society of London. 10. The Royal Society: 37–39. doi:10.1098/rspl.1859.0017. ISSN 0370-1662. Received May 26, 1859
^ Weekly Evening Meeting, Friday, June 10, 1859. The Prince Consort, Vice-Patron, in the Chair. John Tyndall, Esq. F.R.S. "On the Transmission of Heat of different qualities through Gases of different kinds", in Royal Institution of Great Britain (1862). Notices of the Proceedings at the Meetings of the Members of the Royal Institution of Great Britain: With Abstracts of the Discourses Delivered at the Evening Meetings. pp. 155–158.
^ Details of Tyndall's device for measuring the infrared absorptive power of a gas are described in James Rodger Fleming (2005). Historical Perspectives on Climate Change. Oxford University Press. pp. 69–70. ISBN 978-0-19-518973-5. Greater details are in Chapter I of Tyndall's own book Contributions to Molecular Physics in the Domain of Radiant Heat.
^ Baum, Rudy M. Sr. (2016). "Future Calculations: The first climate change believer". Distillations. 2 (2): 38–39. Retrieved 22 March 2018.
^ Tyndall explained the "greenhouse effect" in a public lecture in January 1863 entitled "On Radiation Through The Earth's Atmosphere". He emphasized that our environment would be much colder at nighttime in the absence of the greenhouse effect. This short, readable lecture is reprinted in his 1872 book about radiant heat, available here.
^ Jackson, Roland (20 March 2020). "Eunice Foote, John Tyndall and a question of priority". Notes and Records: The Royal Society Journal of the History of Science. 74 (1): 105–118. doi:10.1098/rsnr.2018.0066. S2CID 186208096.
^ ^a ^b After his measurements of infrared absorption by gases in 1859, Tyndall measured infrared emission by gases in 1860, with respect to broad-spectrum infrared radiation. He did this for many different gases, and when the gases were ranked by their emissive powers the rank order was the same as it was for their absorptive powers. His February 1861 article "On the Absorption and Radiation of Heat by Gases and Vapours, and on the Physical Connexion of Radiation, Absorption, and Conduction" in Philosophical Transactions of the Royal Society of London, Volume 151, pages 1–36, year 1861, was later republished in the book Contributions to Molecular Physics in the Domain of Radiant Heat, Chapter I; and in the same book there is more in Chapter II section 11 (year 1862), and chapter IX section 6 (year 1865). These laboratory experiments by Tyndall on "the reciprocity of absorption and radiation on the part of gases" were informed by experiments done on solids by Balfour Stewart in 1858 and 1859. The two relevant articles by Balfour Stewart are online as republished in 1901 in The Laws of Radiation and Absorption: Memoirs by Prévost, Stewart, Kirchhoff and Bunsen.
^ ^a ^b In the late 1850s Balfour Stewart had showed that cold rock-salt was a very strong absorber of the radiations from hot rock-salt, even though rock-salt was a very weak absorber of the radiations from all other kinds of heat-sources tested. By the early 1860s this had been generalized in the scientific literature to the principle that any kind of chemical will very strongly absorb the radiations coming from a separate body of the same kind of chemical. In Tyndall's words this was a "principle which lies at the basis of spectrum analysis, ... namely, that a body which is competent to emit any ray, whether of heat or light, is competent in the same degree to absorb that ray" (1866). Tyndall made several original observations around 1863 by beginning with the assumption that this principle is correct. The following is a summary of one of them. It was well-known at the time that in a flame of burning carbon monoxide, the carbon monoxide chemically combines with the oxygen of the air to form carbon dioxide plus heat. Tyndall observed that if a body of cold or room-temperature carbon dioxide is placed near the flame "the cold gas is intensely opaque to [i.e. it very strongly absorbs] the radiation from this particular flame, though it is highly transparent to [i.e. it very weakly absorbs] heat of every other kind." Thus the great bulk of the heat in the carbon monoxide flame fits the emission spectrum of carbon dioxide, implying the heat is a radiant emission from the newly formed carbon dioxide molecules. Tyndall got the same type of result with a flame of burning hydrogen, another flame known to be chemically simple in the sense that very little intermediate or transitory molecules are produced in it. This appears to be the first demonstration that the heat given out in chemical reactions has its physical origination within the new molecules. Tyndall's report of the demonstration is in Contributions to Molecular Physics in the Domain of Radiant Heat, sections 11–17 of Chapter VI, dated 1864. A related demonstration is in sections 3–8 of Chapter V, dated 1863. It is also discussed in Tyndall's Fragments of Science, Volume I Chapter III, dated 1866. For a modern analysis of where the heat is coming from in the carbon monoxide flame see R. N. Dixon (1963). "The Carbon Monoxide Flame Bands". Proceedings of the Royal Society of London. Series A. 275 (1362): 431–446. Bibcode:1963RSPSA.275..431D. doi:10.1098/rspa.1963.0178. JSTOR 2414583. S2CID 98444207. Tyndall also interpreted the carbon monoxide flame as showing that carbon dioxide's spectral profile remains the same at room temperature and at a temperature of over 2000 °C, the temperature in the flame; and likewise for the product of the hydrogen flame. This was in contrast to the easily seen fact in solids such as carbon and platinum where the spectral profile moves towards the quicker frequencies when the temperature is increased.
^ See calorescence.
^ Reported in a 10-page biography of John Tyndall by Arthur Whitmore Smith, a professor of physics, writing in an American scientific monthly in 1920; available online.
^ The term Tyndall Scattering is subject to some definitional overlap with the terms Rayleigh Scattering and Mie Scattering.
^ A brief account of the early history of thermophoresis studies is given in Encyclopedia of Surface and Colloid Science, 2nd edition, year 2006, pages 6274–6275. Thermophoresis was first described by Tyndall in a Royal Institution lecture titled "On Haze and Dust", year 1870, which is included in Tyndall's 1870 book Scientific Addresses. He observed the thermophoresis in gas mixtures. Unrelatedly and unknown to him, thermophoresis was observed in liquid mixtures in 1856 by Carl Ludwig.
^ Contributions to Molecular Physics in the Domain of Radiant Heat pages 199–214, dated 1863. Those experiments demanded "scrupulous accuracy, and minute attention to details", he later said (ref). In one of his other and simpler experiments, infrared plus visible light beaming from an 1860s-vintage electric lamp was brought to a focus point via a powerful concave mirror. On its way to the focus point, the beam was passed through a body of liquid water. At the focus point, beyond the water, the beam was able to set wood on fire but was not able to melt frozen water. On removal of the intervening body of liquid water, the frozen water rapidly melted. This indicates that frequencies emerging from water are specifically frequencies that water molecules do not absorb and water's phase state does not have a discernible role. Contributions to Molecular Physics page 314 (year 1865); and ref page 84-85 (year 1866).
^ James W. Gentry; Lin Jui-Chen (1996). "The Legacy of John Tyndall in Aerosol Science". Journal of Aerosol Science. 27: S503–S504. Bibcode:1996JAerS..27S.503G. doi:10.1016/0021-8502(96)00324-2. Tyndall's primary contributions were...[among other things]... the design of experiments which increased the deflections of the galvanometer by two orders of magnitude from the earlier measurements for double refraction (by Knoblauch) and the Faraday effect (by de la Provostaye and Desains). Tyndall's presentation of the subject begins under the heading "The Identity of Light and Radiant Heat" in his 1873 tutorial book Six Lectures on Light.
^ Michael B. Jaffe (2008). "Infrared Measurement of Carbon Dioxide in the Human Breath: Breathe-Through Devices from Tyndall to the Present Day" (PDF). Anesthesia & Analgesia. 107 (3): 890–904. doi:10.1213/ane.0b013e31817ee3b3. PMID 18713902. S2CID 15610449. See also John Tyndall, Contributions to Molecular Physics in the Domain of Radiant Heat, §4 of Chapter II (dated 1862) and §13 of Chapter VI (dated 1864).
^ Tyndall's experiment on ozone is in sections 17–19 of "Further Researches on the Absorption and Radiation of Heat by Gaseous Matter", dated January 1862; online. Some biographical sketches of Tyndall state that Tyndall "showed that ozone was an oxygen cluster rather than a hydrogen compound" (this statement is at Today in Science History and The Encyclopedia of Earth, for example). But it is an overstatement, because other researchers had already shown at an earlier date that ozone was an oxygen cluster. Tyndall's experiment just helped to reaffirm it by a different method. For background historical context see "The History of Ozone 1839 – 1868" Archived 11 April 2008 at the Wayback Machine, by Mordecai B. Rubin (2001).
^ Discussed in Tyndall's book The Floating-matter of the Air. Tyndall writes (page 46): "Gravity is not the only agent.... It is practically impossible to surround a closed vessel by an absolutely uniform temperature; and where differences of temperature, however small, exist, air-currents will be established. By such gentle currents the floating particles are gradually brought into contact with all the surrounding surfaces. To these they adhere, and the suspended matter finally disappears from the air altogether."
^ Microform.co.uk Archived 4 March 2016 at the Wayback Machine has a catalog (perhaps incomplete) of letters from Pasteur to Tyndall. Communications between the two were most frequent during the mid-1870s. The earliest letter from Pasteur to Tyndall is dated 10 August 1871. Pasteur's early research had been in fermentation vats and broths. As he aimed to extend his program to air, he got in touch with Tyndall as someone who was an expert at dealing technically with air. In June 1871 extracts from a lecture by Tyndall entitled "Dust and Disease" were published in the British Medical Journal. The "Dust and Disease" lecture was Tyndall's first publication in this area. Ten years later Tyndall published a 350-page book Essays on the Floating-matter of the Air in relation to Putrefaction and Infection which consists primarily of descriptions of his own experiments.
^ Conant, James Bryant (1957). "Pasteur's and Tyndall's Study of Spontaneous Generation". Harvard Case Histories in Experimental Science. Vol. 2. Cambridge, Massachusetts: Harvard University Press. pp. 489–539.
^ Ian Taggart History of air-purifying type gas-masks in the 19th-century Archived 2 May 2013 at the Wayback Machine. John Tyndall (1871), Fireman's Respirator, and John Tyndall (1874). "On Some Recent Experiments with a Fireman's Respirator". Proceedings of the Royal Society of London. 22 (148–155): 359–361. doi:10.1098/rspl.1873.0060. JSTOR 112853. S2CID 145628172.
^ Lord Rayleigh, who published a much-praised tome about sound in 1877–78, has a review of Tyndall's original contributions to the science of sound in Proceedings of the Royal Institution, Volume XIV, pages 221–223, dated 16 March 1894. Tyndall's own presentation of his "Researches on the Acoustic Transparency of the Atmosphere" is in chapter VII of the 3rd edition (1875) of Tyndall's book Sound.
^ In the later 19th century the Royal Society of London compiled an international catalog of scientific research papers, covering the whole century, indexed by author. In the Royal Society's catalog 147 entries appear under Tyndall's name between 1850 and 1883. Between 1850 and 1863 Tyndall published 74 papers in research journals, an average of nearly one every two months. A listing of these papers can be found in the Royal Society's 1872 publication Catalogue of Scientific Papers Volume VI. From 1864 through 1873 he published 41 papers, and these are listed in the Royal Society's Catalogue of Scientific Papers Volume VIII. From 1874 through 1883 he published 32 papers, and these are listed in Catalogue of Scientific Papers Volume XI. He produced very little after he got sick in 1885. Apart from his research papers, between 1860 and 1881 Tyndall also published 13 science books (see List of John Tyndall's books).
^ "John Tyndall's Lecture Courses at the Royal Institution and their Reception" Archived 4 March 2016 at the Wayback Machine by Emily Hankin (year 2008), pages 28–31, says that Tyndall and his audiences liked experimental demonstrations that had an element of spectacle, and that Tyndall selected lecture topics with that consideration partly in mind. The biographers Eve and Creasey are quoted as saying: "His lectures were written down, rehearsed, and profusely illustrated with experiment. He knew that a public lecture should have the same exacting care in production as a play in a theatre."
^ Daniel Colladon's 1842 "light fountain" article is entitled "On the reflections of a ray of light inside a parabolic liquid stream". The history of this during the 19th century is in the book The Story of Fiber Optics by Jeff Hecht, year 1999, Chapter 2. In Tyndall's own 1870 book Notes on Light Tyndall has a section entitled "Total Reflexion" where he explains: "When the light passes from air into water, the refracted ray is bent towards the perpendicular.... When the ray passes from water to air it is bent from the perpendicular.... If the angle which the ray in water encloses with the perpendicular to the surface be greater than 48 degrees, the ray will not quit the water at all: it will be totally reflected at the surface.... The angle which marks the limit where total reflexion begins is called the limiting angle of the medium. For water this angle is 48° 27', for flint glass it is 38° 41', while for diamond it is 23° 42'."
^ Quoted from Tyndall's Fragments of Science, Volume II.
^ In early 1861 Tyndall was writing: "All the gases and vapours hitherto mentioned [which are absorbers of radiant heat] are transparent to light; that is to say, the waves of the visible spectrum pass among them without sensible absorption. Hence it is plain that their absorptive power depends on the periodicity of the undulations which strike them.... By Kirchhoff it has been conclusively shown that every atom absorbs in a special degree those waves which are synchronous with its own periods of vibration." Contributions to Molecular Physics in the Domain of Radiant Heat.
^ Contributions to Molecular Physics in the Domain of Radiant Heat, pages 80–81 (dated 1862). He says on page 334 (dated 1869) that the difference in absorption rates "may be a millionfold" : [abridged] "Let nitrogen and hydrogen be mixed mechanically together in the proportion of 14:3. Radiant heat will pass through the mixture as through a vacuum; the amount of heat intercepted is so small as to be practically insensible. The moment the nitrogen and hydrogen build themselves together into the molecules of ammonia [NH₃] the amount of radiant heat which they absorb is augmented more than a thousandfold. It may be a millionfold, for we do not yet know how small the absorption of the absolutely pure mixture really is. The act of chemical union is the sole cause of the enormous alteration in the amount of heat intercepted. The converse is also true: dissolve the chemical bond of the ammonia, and you instantly destroy the absorption."
^ In 1853 Anders Ångström had argued, based on general principles of resonance, that an incandescent gas should emit luminous rays of the same frequencies as those it can absorb. After this was affirmed and made more general experimentally by Tyndall and others in the early 1860s, Ångström got a lot of plaudits. When the original paper by Ångström (published in German in 1854) was published in English in 1855, the translator from the German was John Tyndall. John Charles Drury Brand (1995). Lines of light: the sources of dispersive spectroscopy, 1800–1930. CRC Press. pp. 61–. ISBN 978-2-88449-162-4.
^ Contributions to Molecular Physics in the Domain of Radiant Heat page 428, dated 1868. When talking about chemical reactions produced by light he says "if the absorption [of radiant energy] were the act of the molecule as a whole, the relative motions of its constituent atoms would remain unchanged, and there would be no mechanical cause for their separation [in a photochemical decomposition]." Therefore in a photochemical decomposition, "it is probably the synchronism of the vibrations of one portion of the molecule with the incident waves which enables the amplitude of those vibrations to augment [i.e. resonate] until the chain which binds the parts of the molecule together is snapped asunder."
^ Maria Yamalidou (1999). "John Tyndall, The Rhetorician of Molecularity. Part One. Crossing the Boundary towards the Invisible". Notes and Records of the Royal Society of London. 53 (2): 231–242. doi:10.1098/rsnr.1999.0077. S2CID 145674374. Maria Yamalidou (1999). "John Tyndall, The Rhetorician of Molecularity. Part Two. Questions Put to Nature". Notes and Records of the Royal Society of London. 53 (3): 319–331. doi:10.1098/rsnr.1999.0085. S2CID 144929561. See also Tyndall's popular essay "Atoms, Molecules, and Ether Waves" (year 1882) in Tyndall's book of essays for a broad audience, New Fragments.
^ Among the hundreds of public lectures by Tyndall for non-specialist audiences at the Royal Institution, he delivered in 1861, 1863, 1865, 1867, 1869, 1871, 1873, 1875, 1877, 1879, 1882 and 1884 the annual Royal Institution Christmas Lectures for young audiences on the subjects Light; Electricity at Rest and Electricity in Motion; Sound; Heat and Cold; Light; Ice, Water, Vapour and Air; The Motion and Sensation of Sound; Experimental Electricity; Heat, Visible and Invisible; Water and Air; Light and the Eye and The Sources of Electricity, respectively. Appendix A at REF Archived 4 March 2016 at the Wayback Machine lists subject areas of other lecture series for non-experts by Tyndall at the Royal Institution over the years.
^ During the 14 days in December 1872 when Tyndall gave public evening lectures in Manhattan, The New York Times printed news items about Tyndall on 9 of the days, some of them lengthy efforts at recapitulating what Professor Tyndall had said in his lecture the night before about the nature of light. The New York Times noted that more than half the people attending the lectures were women (which was generally true of Tyndall's lectures in London as well) and noted that the series of evening lectures about the nature of light delivered in Washington DC was attended by eminent U.S. Senators, Cabinet Ministers, and one night the U.S. President himself, accompanied by his daughter. The New York Times Archives, 4 December 1872 – 9 February 1873.
^ Tyndall was a celebrity in the later 19th century and he was one of the people profiled in the 1878 book Celebrities at Home (2nd Series).
^ Tyndall said in 1884: "Two factors went to the formation of a teacher. In regard to knowledge he must, of course, be master of his work.... [and secondly] a power of character must underlie and enforce the work of the intellect. There were men who could so rouse and energise their pupils – so call forth their strength and the pleasure of its exercise – as to make the hardest work agreeable. Without this power it is questionable whether the teacher could ever really enjoy his vocation; with it, I do not know a higher, nobler, and more blessed calling." New Fragments.
^ Some of his science books were short, like 80 pages, and others were not. See the List of John Tyndall's books.
^ A catalog of the German editions of Tyndall's books at Worldcat.org.
^ A catalog of the French editions of Tyndall's books at Worldcat.org.
^ Quoted from Tyndall's The Forms of Water in Clouds and Rivers, Ice and Glaciers, year 1872.
^ John Tyndall, Sound, 3rd edition (1875).
^ The UK publisher was Longmans. The US publisher was Appleton. Longmans kept the book in print until sometime after 1908 and Appleton until sometime after 1915. See Worldcat.org. The German publisher, Braunschweig, introduced a renewed German edition in 1894; and the French publisher, Gauthier-Villars, in 1887. In Russian the first edition was in 1864 (ref) and an updated edition came out in Russian in 1888 (ref).
^ J. Clerk Maxwell (1871, 1872) Theory of Heat, preface page vi (publisher: Longmans, Green & Co).
^ A review of how Tyndall demarcated science from religion, marshalling quotes from Tyndall, is in Gieryn, Thomas F. (1999). "John Tyndall's Double Boundary-Work". Cultural Boundaries of Science. The University of Chicago Press. pp. 37–64.
^ The text of Tyndall's 1874 Belfast Address is available at Victorianweb.org. This speech got more coverage in the Victorian-era newspapers than any other single public speech in the decades-long Victorian debate over the status of evolution theory. A lengthy review of the speech and the speech's reception by London newspapers was published by The New York Times on 5 September 1874. It is downloadable. The great majority of London newspapers either endorsed Tyndall's position or took a neutral but respectful attitude towards it. Among other commentators the speech did have critics but a majority of these looked askance at subtleties and minor aspects (e.g.) Archived 7 September 2008 at the Wayback Machine, (e.g.); only a minority defended a role for religious belief in formation of knowledge. As the London Times put it when the speech was making front-page news: "It is probably part of the great change in the manners of this country that [the speech]... will now encounter little contradiction even in the most religious circles" (reprinted by New York Times, 7 Sep 1874). Among the exceptions, the Irish Catholic bishops decried it as paganism. Because the speech got widespread attention and little contradiction, and came from the Establishment post of the presidency of the British Association for the Advancement of Science, later historians have seen the speech as the "final victory" of the evolutionists in Victorian Britain. Robert M. Young (1985). Darwin's Metaphor: Nature's Place in Victorian Culture. CUP Archive. p. 257. ISBN 9780521317429.
^ Those quotations are from the Syllabus of Errors decree (year 1864, Pope Pius IX) and the Libertas decree (year 1888, Pope Leo XIII). The Libertas decree also says: [¶27, abridged] "The divine teaching of the Church brings the sure guidance of shining light. Therefore, there is no reason why true science should feel aggrieved at having to bear the restraint of laws by which, in the judgment of the Church, human teaching has to be controlled."
^ For Italy see Prisoner in the Vatican. Also see Don O'Leary (2006). Roman Catholicism and Modern Science: A History. Continuum International Publishing Group. pp. 57. ISBN 978-0-8264-1868-5.
^ For a list of Tyndall's pamphlets against Irish Home Rule search both Amazon and National Library of Australia. One of the pamphlets, Mr. Gladstone's Sudden Reversal of Polarity, documented how British Prime Minister Gladstone did a flip-flop on the Home Rule question. The intent was to undermine Gladstone's intellectual credibility on the question. Gladstone publicly defended himself against the attack. The debate between them got a lot of attention in the newspapers. Tyndall was a conspicuous participant in the Irish Home Rule debate in the London newspapers between 1886 and 1893. When he died in 1893, The Times newspaper obituary noted that "our readers will remember many eloquent letters written by him of late years, full of unsparing condemnation of Mr. Gladstone's recent [Ireland] policy."
^ More from Tyndall's letter is in the year 1891 compilation Gladstone, Ireland, Rome: A word of warning to electors (publisher: Fowler Brothers), page 119.
^ The scientists of the British Isles were nearly unanimous in opposing Irish Home Rule, but, to Tyndall's disappointment, a majority of them also thought that the matter didn't have enough direct bearing on the vital interests of science to warrant an organized formal denunciation by them. See: Jones, Greta (2001). "Scientists against Home Rule". In Boyce, D. George; O'Day, Alan (eds.). Defenders of the Union: A Survey of British and Irish Unionism Since 1801. London: Routledge. pp. 188–208.
^ ^a ^b ^c The collection of Tyndall's essays where his views on religion are most clearly stated is Fragments of Science, Volume Two (also published under the title Fragments of Science for Unscientific People). It is online in HTML text format at Gutenberg.org and in other text formats at Archive.org.
^ ^a ^b DeYoung, Ursula (2011). A Vision of Modern Science: John Tyndall and the Role of the Scientist in Victorian Culture. Palgrave Macmillan US. pp. 280. ISBN 978-0-230-11053-3. Reports that Tyndall's religious beliefs were "half-agnostic, half-deistic" (page 2) and "Tyndall viewed religion itself as both inescapable and emotionally necessary for humanity, though his conviction of religion's importance was often lost on his critics" (page 5).
^ William Hodson Brock; Norman D. McMillan; R. Charles Mollan; Royal Dublin Society (1981). William Hodson Brock (ed.). John Tyndall, essays on a natural philosopher. Royal Dublin Society. p. 67. He did not give an answer – but he remained a confirmed agnostic.
^ Arthur Whitmore Smith (1920). John Tyndall (1820–1893). The Science Press. p. 338. Tyndall, like most of his friends, was a reverent agnostic. He did not believe that the ultimate truths of the universe could be expressed in words, or that our limited and finite intelligence could as yet comprehend them. His writings, however, contain many phrases which show that he was familiar with the books of Holy Scripture. And often, after a Sunday evening tea, he would join his friends in the singing of psalm tunes.
^ John Brooke; Geoffrey Cantor (2000). Reconstructing Nature: The Engagement Of Science And Religion. Continuum International Publishing Group. pp. 250 + 254. ISBN 9780567087256. Tyndall's biographers rightly insist that he was not an atheist and instead suggest that he should be labelled an agnostic since he rejected the claims of both scientists and theologians who allowed science to be debased by ungrounded speculations.
^ John H. Lienhard (2006). How Invention Begins: Echoes of Old Voices in the Rise of New Machines. Oxford University Press. p. 204. ISBN 9780195305999. The agnostic physicist John Tyndall once remarked that Faraday drank from a fount on Sunday that refreshed his soul for a week.
^ Simon Thompson (2011). Unjustifiable Risk?: The Story of British Climbing. Cicerone Press Limited. p. 38. ISBN 9781849653787. Tyndall was a committed agnostic who argued fiercely and frequently and once offered to fight a man who disagreed with his high opinion of Thomas Carlyle.
^ Ronald L. Numbers; John Stenhouse, eds. (2001). Disseminating Darwinism: The Role of Place, Race, Religion, and Gender. Cambridge University Press. p. 77. ISBN 9780521011051. Free thinkers and agnostics indeed occupied chairs at Canterbury College and the University of Otago. A. W. Bickerton, professor of chemistry at Canterbury, had trained in London under militant agnostics T. H. Huxley and John Tyndall, and tirelessly popularized scientific materialism in Christchurch, to the annoyance of local Christians besides Maskell.
^ Anthony Kenny (2005). The Unknown God: Agnostic Essays. Continuum International Publishing Group. p. 161. ISBN 9780826476340. John Tyndall, the agnostic President of the Royal Society, thus describes the view from the summit of the Weisshorn: 'An influence seemed to proceed from it direct to the soul; the delight and exultation experienced were not those of Reason or Knowledge, but of Being...'
^ Professor Tyndall's Deed of Trust in Popular Science Monthly, May 1873. See also Prof. Tyndall's Trust in The New York Times, 8 July 1885.
^ Gladstone's Home Rule. The New York Times, 25 June 1892.
^ The value of Tyndall's estate at probate was £22,122: biography of John Tyndall by W. M. Brock in Oxford Dictionary of National Biography (2004). Some ways to assess today the magnitude of £22,122 wealth in 1893 are at MeasuringWorth.com.
^ Haia Shpayer-Makov. "A Work-Life History of Policemen in Victorian and Edwardian England" (PDF). University of Haifa, Israel. p. 10.
^ In late years he was taking magnesia for dyspepsia and chloral hydrate for insomnia. His wife, who administered the drugs, accidentally gave him none of the former and a lethal overdose of the latter. A newspaper report of Mrs. Tyndall's testimony at the coroner's inquest: "Mrs. Tyndall's Fatal Error". The New York Times. 25 December 1893.
^ Edward Frankland (1894). "Obituary Notice of John Tyndall". Proceedings of the Royal Society of London. 55: xviii–xxxiv.
^ Dry, Sandra (2018). "A long-awaited biography does justice to John Tyndall, a pioneering climate researcher and science advocate". Science. 360: 1307. doi:10.1126/science.aat6293. S2CID 49357758.
^ Louisa Tyndall wanted a collaborator, but was unsatisfied with all candidates. Later, according to Crowther, she would only accept one who would live in her own house, and none such was found. Crowther, J. G. (1968). Scientific Types. London: Barrie & Rockliff, The Crescent Press Ltd. pp. 187–188. ISBN 9780248997294.
^ "Tyndalldenkmal". map.geo.admin.ch. Swiss Confederation. Retrieved 10 April 2019.
^ The short book On Radiation (1865) was wholly incorporated into the long book Fragments of Science (1871).
^ The short book Scientific Addresses was published in America only. It consisted of three speeches delivered in Britain in 1868–1870. Partly published in Britain in the short book entitled Essays on the Use and Limit of the Imagination in Science. Some of this material was republished in the Fragments of Science collection.

Sources

Biographies of John Tyndall

Eve, A.S.; Creasey, C.H. (1945). Life and Work of John Tyndall. London: Macmillan. 430 pages. This is the "official" biography.
William Tulloch Jeans wrote a 100-page biography of Professor Tyndall in 1887 (the year Tyndall retired from the Royal Institution). Downloadable. See also The Lives of Electricians: Professors Tyndall, Wheatstone, and Morse. (1887, Whittaker & Co.)
Louisa Charlotte Tyndall, his wife, wrote an 8-page biography of John Tyndall that was published in 1899 in Dictionary of National Biography (volume 57). It is readable online (and a 1903 republication of the same biography is also readable online).
Edward Frankland, a longtime friend, wrote a 16-page biography of John Tyndall as an obituary in 1894 in a scientific journal. It is readable online.
D. Thompson (1957). "John Tyndall (1820–1893): A study in vocational enterprise". Journal of Vocational Education & Training. 9 (18): 38–48. doi:10.1080/03057875780000061. Gives an account of Tyndall's vocational development prior to 1853.
Brock, W.H. (1981). John Tyndall, Essays on a Natural Philosopher. Dublin: Royal Dublin Society. 220 pages.
Arthur Whitmore Smith, a professor of physics, wrote a 10-page biography of John Tyndall in 1920 in a scientific monthly. Readable online.
Anon (1894). "Obituary notices". Journal of the Chemical Society, Transactions. 65: 389–393. doi:10.1039/CT8946500382.
John Walter Gregory, a naturalist, wrote a 9-page obituary of John Tyndall in 1894 in a natural science journal. Readable online.
An early, 8-page profile of John Tyndall appeared in 1864 in Portraits of Men of Eminence in Literature, Science and Art, Volume II, pages 25–32.
A brief profile of Tyndall based on information supplied by Tyndall himself appeared in 1874 in "Scientific worthies, IV.--John Tyndall". Nature. 10 (251): 299–302. 1874. Bibcode:1874Natur..10..299.. doi:10.1038/010299a0..
Claud Schuster, John Tyndall as a Mountaineer, 56-page essay included in Schuster's book Postscript to Adventure, year 1950 (New Alpine Library: Eyre & Spottiswoode, London).
DeYoung, Ursula (2011). A Vision of Modern Science: John Tyndall and the Role of the Scientist in Victorian Culture. Palgrave Macmillan. pp. 280. ISBN 978-0-230-11053-3..
Jackson, Roland (2018). The Ascent of John Tyndall. Oxford University Press. p. 556. ISBN 9780198788959. The first major biography of Tyndall since 1945.
Chisholm, Hugh, ed. (1911). "Tyndall, John" . Encyclopædia Britannica. Vol. 27 (11th ed.). Cambridge University Press. pp. 499–500.

External links

Portraits of John Tyndall at the National Portrait Gallery, London
Works by John Tyndall at Project Gutenberg
Works by or about John Tyndall at the Internet Archive
Works by John Tyndall at LibriVox (public domain audiobooks)
A blog maintained by a historian who is involved in transcribing Tyndall's letters.
The Tyndall Correspondence Project website

[1] "Музей истории телефона - История телефона".

[2] Pupin, Michael. From immigrant to inventor. — New York, London: Charles Scribner's Sons, 1949. — p. 200. — 396 p.

[3] "APS Member History". search.amphilsoc.org. Retrieved 26 April 2021.

[4] When working for the government's land surveying agency in Lancashire, Tyndall was one of a number of employees who signed a petition calling for higher wages plus some other changes in working conditions. In November 1843, all of the signatories to the petition were dismissed from their jobs. In August 1844, Tyndall was hired by a railway surveying company in Lancashire at almost four times higher pay than the government had been paying him. D. Thompson (1957). "John Tyndall: A study in vocational enterprise". The Vocational Aspect of Education. 9 (18): 38–48. doi:10.1080/03057875780000061. Also Eve, A.S. & Creasey, C.H. (1945). Life and Work of John Tyndall.

[5] Tyndall was the chief surveyor for the proposed railway line from Halifax to Keighley in 1846, according to Thomas Archer Hirst, who worked under Tyndall at the same engineering firm at the time – Ref. Tyndall described himself as the "principal assistant" at the firm – "Tyndall's Obituary for Hirst". Proceedings of the Royal Society of London. 52: xiv–xv. 1893.

[6] Tyndall gave detailed recollections about his life in the 1840s in "Address Delivered at the Birkbeck Institution on October 22, 1884", which is published as a chapter in his New Fragments essays (1892).

[7] Tyndall studied under Bunsen from 1848 to 1850. Thirty-five years later, he praised Bunsen for explaining chemistry and physics in "the language of experiment" and said "I still look back on Bunsen as the nearest approach to my ideal of a university teacher." New Fragments.

[8] Tyndall's main 1850s research reports on diamagnetism were later republished as a collection, which is available at Archive.org. In the preface to the collection Tyndall writes about the work's historical context. William T. Jeans' biography of Tyndall (pp. 22–34) also goes into the historical context of Tyndall's diamagnetic investigations.

[9] Michael Faraday advocated for Tyndall's appointment at the Royal Institution. As part of that, in a letter to the managers of the Royal Institution on 23 May 1853, Faraday praised Tyndall's abilities as a lecturer: "I have heard him on two or three occasions, when his manner of expounding nature by discourse and experiment was in my judgement excellent". Source: Emily Hankin (2008), "John Tyndall's Lecture Courses at the Royal Institution and their Reception" Archived 4 March 2016 at the Wayback Machine.

[10] According to the account in Tyndall's book The Glaciers of the Alps (1860), Tyndall in 1858 reached the summit of Monte Rosa solo carrying only a ham sandwich for sustenance. The first ascent of Monte Rosa had taken place only in 1855. He had already reached the summit of Monte Rosa in a guided group on 10 August 1858 but he made an unplanned second ascent solo on 17 August 1858 after breakfast: "the waiter then provided me with a ham sandwich, and, with my scrip thus frugally furnished, I thought the heights of Monte Rosa might be won...." (continued at pages 151–157 of Glaciers of the Alps). Besides Tyndall's own books, information about Tyndall as a mountaineer is available at A History of Mountaineering in the Alps by Claire Eliane Engel and The Victorian Mountaineers by Ronald Clark.

[11] That quotation from Tyndall appears in Chisholm (1911). For Forbes' view of the issue see "Appendix A" (plus Chapter XV) of Life and Letters of James David Forbes.

[12] "Geographic Names Information System". edits.nationalmap.gov. Retrieved 28 July 2022.

[13] Brewer, William H. (1873). "Discovery of Mount Tyndall". The Popular Science Monthly. 2: 739–741.

[14] Haast, Julius (1864). "Notes on the Mountains and Glaciers of the Canterbury Province, New Zealand". Journal of the Royal Geographical Society of London. 34: 87–96. doi:10.2307/1798467. JSTOR 1798467.

[Tyndall_Bakerian-15] Tyndall, John (31 December 1861). "I. The Bakerian Lecture.—On the Absorption and Radiation of Heat by Gases and Vapours, and on the Physical Connexion of Radiation, Absorption, and Conduction". Philosophical Transactions of the Royal Society of London. 151. The Royal Society: 1–36. doi:10.1098/rstl.1861.0001. ISSN 0261-0523. Received January 10, Read February 7, 1861

[Climate_Lab_Book-16] Jackson, Roland. "John Tyndall: founder of climate science?". Climate Lab Book. Retrieved 12 March 2020.

[RI_who_discovered-17] Jackson, Roland (5 March 2020). "Who discovered the greenhouse effect?". The Royal Institution: Science Lives Here. Retrieved 12 March 2020. Note; it is now appreciated that in 1856 Eunice Foote had published experiments on how the sun's rays heated gases, giving evidence that CO₂ and water vapour absorbed heat, and speculated that changes in their proportions could affect climate, but she did not differentiate the effects of infrared heat.

[The_Royal_Society_pp._37–39-18] Tyndall, John (31 December 1860). "VII. Note on the transmission of radiant heat through gaseous bodies". Proceedings of the Royal Society of London. 10. The Royal Society: 37–39. doi:10.1098/rspl.1859.0017. ISSN 0370-1662. Received May 26, 1859

[RI_10_June_1859-19] Weekly Evening Meeting, Friday, June 10, 1859. The Prince Consort, Vice-Patron, in the Chair. John Tyndall, Esq. F.R.S. "On the Transmission of Heat of different qualities through Gases of different kinds", in Royal Institution of Great Britain (1862). Notices of the Proceedings at the Meetings of the Members of the Royal Institution of Great Britain: With Abstracts of the Discourses Delivered at the Evening Meetings. pp. 155–158.

[20] Details of Tyndall's device for measuring the infrared absorptive power of a gas are described in James Rodger Fleming (2005). Historical Perspectives on Climate Change. Oxford University Press. pp. 69–70. ISBN 978-0-19-518973-5. Greater details are in Chapter I of Tyndall's own book Contributions to Molecular Physics in the Domain of Radiant Heat.

[Baum-21] Baum, Rudy M. Sr. (2016). "Future Calculations: The first climate change believer". Distillations. 2 (2): 38–39. Retrieved 22 March 2018.

[22] Tyndall explained the "greenhouse effect" in a public lecture in January 1863 entitled "On Radiation Through The Earth's Atmosphere". He emphasized that our environment would be much colder at nighttime in the absence of the greenhouse effect. This short, readable lecture is reprinted in his 1872 book about radiant heat, available here.

[23] Jackson, Roland (20 March 2020). "Eunice Foote, John Tyndall and a question of priority". Notes and Records: The Royal Society Journal of the History of Science. 74 (1): 105–118. doi:10.1098/rsnr.2018.0066. S2CID 186208096.

[InfraredEmissionByGases-24] After his measurements of infrared absorption by gases in 1859, Tyndall measured infrared emission by gases in 1860, with respect to broad-spectrum infrared radiation. He did this for many different gases, and when the gases were ranked by their emissive powers the rank order was the same as it was for their absorptive powers. His February 1861 article "On the Absorption and Radiation of Heat by Gases and Vapours, and on the Physical Connexion of Radiation, Absorption, and Conduction" in Philosophical Transactions of the Royal Society of London, Volume 151, pages 1–36, year 1861, was later republished in the book Contributions to Molecular Physics in the Domain of Radiant Heat, Chapter I; and in the same book there is more in Chapter II section 11 (year 1862), and chapter IX section 6 (year 1865). These laboratory experiments by Tyndall on "the reciprocity of absorption and radiation on the part of gases" were informed by experiments done on solids by Balfour Stewart in 1858 and 1859. The two relevant articles by Balfour Stewart are online as republished in 1901 in The Laws of Radiation and Absorption: Memoirs by Prévost, Stewart, Kirchhoff and Bunsen.

[MolecularPhysicsInDomainOfRadiantHeat-25] In the late 1850s Balfour Stewart had showed that cold rock-salt was a very strong absorber of the radiations from hot rock-salt, even though rock-salt was a very weak absorber of the radiations from all other kinds of heat-sources tested. By the early 1860s this had been generalized in the scientific literature to the principle that any kind of chemical will very strongly absorb the radiations coming from a separate body of the same kind of chemical. In Tyndall's words this was a "principle which lies at the basis of spectrum analysis, ... namely, that a body which is competent to emit any ray, whether of heat or light, is competent in the same degree to absorb that ray" (1866). Tyndall made several original observations around 1863 by beginning with the assumption that this principle is correct. The following is a summary of one of them. It was well-known at the time that in a flame of burning carbon monoxide, the carbon monoxide chemically combines with the oxygen of the air to form carbon dioxide plus heat. Tyndall observed that if a body of cold or room-temperature carbon dioxide is placed near the flame "the cold gas is intensely opaque to [i.e. it very strongly absorbs] the radiation from this particular flame, though it is highly transparent to [i.e. it very weakly absorbs] heat of every other kind." Thus the great bulk of the heat in the carbon monoxide flame fits the emission spectrum of carbon dioxide, implying the heat is a radiant emission from the newly formed carbon dioxide molecules. Tyndall got the same type of result with a flame of burning hydrogen, another flame known to be chemically simple in the sense that very little intermediate or transitory molecules are produced in it. This appears to be the first demonstration that the heat given out in chemical reactions has its physical origination within the new molecules. Tyndall's report of the demonstration is in Contributions to Molecular Physics in the Domain of Radiant Heat, sections 11–17 of Chapter VI, dated 1864. A related demonstration is in sections 3–8 of Chapter V, dated 1863. It is also discussed in Tyndall's Fragments of Science, Volume I Chapter III, dated 1866. For a modern analysis of where the heat is coming from in the carbon monoxide flame see R. N. Dixon (1963). "The Carbon Monoxide Flame Bands". Proceedings of the Royal Society of London. Series A. 275 (1362): 431–446. Bibcode:1963RSPSA.275..431D. doi:10.1098/rspa.1963.0178. JSTOR 2414583. S2CID 98444207. Tyndall also interpreted the carbon monoxide flame as showing that carbon dioxide's spectral profile remains the same at room temperature and at a temperature of over 2000 °C, the temperature in the flame; and likewise for the product of the hydrogen flame. This was in contrast to the easily seen fact in solids such as carbon and platinum where the spectral profile moves towards the quicker frequencies when the temperature is increased.

[26] See calorescence.

[27] Reported in a 10-page biography of John Tyndall by Arthur Whitmore Smith, a professor of physics, writing in an American scientific monthly in 1920; available online.

[28] The term Tyndall Scattering is subject to some definitional overlap with the terms Rayleigh Scattering and Mie Scattering.

[29] A brief account of the early history of thermophoresis studies is given in Encyclopedia of Surface and Colloid Science, 2nd edition, year 2006, pages 6274–6275. Thermophoresis was first described by Tyndall in a Royal Institution lecture titled "On Haze and Dust", year 1870, which is included in Tyndall's 1870 book Scientific Addresses. He observed the thermophoresis in gas mixtures. Unrelatedly and unknown to him, thermophoresis was observed in liquid mixtures in 1856 by Carl Ludwig.

[30] Contributions to Molecular Physics in the Domain of Radiant Heat pages 199–214, dated 1863. Those experiments demanded "scrupulous accuracy, and minute attention to details", he later said (ref). In one of his other and simpler experiments, infrared plus visible light beaming from an 1860s-vintage electric lamp was brought to a focus point via a powerful concave mirror. On its way to the focus point, the beam was passed through a body of liquid water. At the focus point, beyond the water, the beam was able to set wood on fire but was not able to melt frozen water. On removal of the intervening body of liquid water, the frozen water rapidly melted. This indicates that frequencies emerging from water are specifically frequencies that water molecules do not absorb and water's phase state does not have a discernible role. Contributions to Molecular Physics page 314 (year 1865); and ref page 84-85 (year 1866).

[31] James W. Gentry; Lin Jui-Chen (1996). "The Legacy of John Tyndall in Aerosol Science". Journal of Aerosol Science. 27: S503–S504. Bibcode:1996JAerS..27S.503G. doi:10.1016/0021-8502(96)00324-2. Tyndall's primary contributions were...[among other things]... the design of experiments which increased the deflections of the galvanometer by two orders of magnitude from the earlier measurements for double refraction (by Knoblauch) and the Faraday effect (by de la Provostaye and Desains). Tyndall's presentation of the subject begins under the heading "The Identity of Light and Radiant Heat" in his 1873 tutorial book Six Lectures on Light.

[32] Michael B. Jaffe (2008). "Infrared Measurement of Carbon Dioxide in the Human Breath: Breathe-Through Devices from Tyndall to the Present Day" (PDF). Anesthesia & Analgesia. 107 (3): 890–904. doi:10.1213/ane.0b013e31817ee3b3. PMID 18713902. S2CID 15610449. See also John Tyndall, Contributions to Molecular Physics in the Domain of Radiant Heat, §4 of Chapter II (dated 1862) and §13 of Chapter VI (dated 1864).

[33] Tyndall's experiment on ozone is in sections 17–19 of "Further Researches on the Absorption and Radiation of Heat by Gaseous Matter", dated January 1862; online. Some biographical sketches of Tyndall state that Tyndall "showed that ozone was an oxygen cluster rather than a hydrogen compound" (this statement is at Today in Science History and The Encyclopedia of Earth, for example). But it is an overstatement, because other researchers had already shown at an earlier date that ozone was an oxygen cluster. Tyndall's experiment just helped to reaffirm it by a different method. For background historical context see "The History of Ozone 1839 – 1868" Archived 11 April 2008 at the Wayback Machine, by Mordecai B. Rubin (2001).

[34] Discussed in Tyndall's book The Floating-matter of the Air. Tyndall writes (page 46): "Gravity is not the only agent.... It is practically impossible to surround a closed vessel by an absolutely uniform temperature; and where differences of temperature, however small, exist, air-currents will be established. By such gentle currents the floating particles are gradually brought into contact with all the surrounding surfaces. To these they adhere, and the suspended matter finally disappears from the air altogether."

[35] Microform.co.uk Archived 4 March 2016 at the Wayback Machine has a catalog (perhaps incomplete) of letters from Pasteur to Tyndall. Communications between the two were most frequent during the mid-1870s. The earliest letter from Pasteur to Tyndall is dated 10 August 1871. Pasteur's early research had been in fermentation vats and broths. As he aimed to extend his program to air, he got in touch with Tyndall as someone who was an expert at dealing technically with air. In June 1871 extracts from a lecture by Tyndall entitled "Dust and Disease" were published in the British Medical Journal. The "Dust and Disease" lecture was Tyndall's first publication in this area. Ten years later Tyndall published a 350-page book Essays on the Floating-matter of the Air in relation to Putrefaction and Infection which consists primarily of descriptions of his own experiments.

[36] Conant, James Bryant (1957). "Pasteur's and Tyndall's Study of Spontaneous Generation". Harvard Case Histories in Experimental Science. Vol. 2. Cambridge, Massachusetts: Harvard University Press. pp. 489–539.

[37] Ian Taggart History of air-purifying type gas-masks in the 19th-century Archived 2 May 2013 at the Wayback Machine. John Tyndall (1871), Fireman's Respirator, and John Tyndall (1874). "On Some Recent Experiments with a Fireman's Respirator". Proceedings of the Royal Society of London. 22 (148–155): 359–361. doi:10.1098/rspl.1873.0060. JSTOR 112853. S2CID 145628172.

[38] Lord Rayleigh, who published a much-praised tome about sound in 1877–78, has a review of Tyndall's original contributions to the science of sound in Proceedings of the Royal Institution, Volume XIV, pages 221–223, dated 16 March 1894. Tyndall's own presentation of his "Researches on the Acoustic Transparency of the Atmosphere" is in chapter VII of the 3rd edition (1875) of Tyndall's book Sound.

[39] In the later 19th century the Royal Society of London compiled an international catalog of scientific research papers, covering the whole century, indexed by author. In the Royal Society's catalog 147 entries appear under Tyndall's name between 1850 and 1883. Between 1850 and 1863 Tyndall published 74 papers in research journals, an average of nearly one every two months. A listing of these papers can be found in the Royal Society's 1872 publication Catalogue of Scientific Papers Volume VI. From 1864 through 1873 he published 41 papers, and these are listed in the Royal Society's Catalogue of Scientific Papers Volume VIII. From 1874 through 1883 he published 32 papers, and these are listed in Catalogue of Scientific Papers Volume XI. He produced very little after he got sick in 1885. Apart from his research papers, between 1860 and 1881 Tyndall also published 13 science books (see List of John Tyndall's books).

[40] "John Tyndall's Lecture Courses at the Royal Institution and their Reception" Archived 4 March 2016 at the Wayback Machine by Emily Hankin (year 2008), pages 28–31, says that Tyndall and his audiences liked experimental demonstrations that had an element of spectacle, and that Tyndall selected lecture topics with that consideration partly in mind. The biographers Eve and Creasey are quoted as saying: "His lectures were written down, rehearsed, and profusely illustrated with experiment. He knew that a public lecture should have the same exacting care in production as a play in a theatre."

[41] Daniel Colladon's 1842 "light fountain" article is entitled "On the reflections of a ray of light inside a parabolic liquid stream". The history of this during the 19th century is in the book The Story of Fiber Optics by Jeff Hecht, year 1999, Chapter 2. In Tyndall's own 1870 book Notes on Light Tyndall has a section entitled "Total Reflexion" where he explains: "When the light passes from air into water, the refracted ray is bent towards the perpendicular.... When the ray passes from water to air it is bent from the perpendicular.... If the angle which the ray in water encloses with the perpendicular to the surface be greater than 48 degrees, the ray will not quit the water at all: it will be totally reflected at the surface.... The angle which marks the limit where total reflexion begins is called the limiting angle of the medium. For water this angle is 48° 27', for flint glass it is 38° 41', while for diamond it is 23° 42'."

[42] Quoted from Tyndall's Fragments of Science, Volume II.

[43] In early 1861 Tyndall was writing: "All the gases and vapours hitherto mentioned [which are absorbers of radiant heat] are transparent to light; that is to say, the waves of the visible spectrum pass among them without sensible absorption. Hence it is plain that their absorptive power depends on the periodicity of the undulations which strike them.... By Kirchhoff it has been conclusively shown that every atom absorbs in a special degree those waves which are synchronous with its own periods of vibration." Contributions to Molecular Physics in the Domain of Radiant Heat.

[44] Contributions to Molecular Physics in the Domain of Radiant Heat, pages 80–81 (dated 1862). He says on page 334 (dated 1869) that the difference in absorption rates "may be a millionfold" : [abridged] "Let nitrogen and hydrogen be mixed mechanically together in the proportion of 14:3. Radiant heat will pass through the mixture as through a vacuum; the amount of heat intercepted is so small as to be practically insensible. The moment the nitrogen and hydrogen build themselves together into the molecules of ammonia [NH₃] the amount of radiant heat which they absorb is augmented more than a thousandfold. It may be a millionfold, for we do not yet know how small the absorption of the absolutely pure mixture really is. The act of chemical union is the sole cause of the enormous alteration in the amount of heat intercepted. The converse is also true: dissolve the chemical bond of the ammonia, and you instantly destroy the absorption."

[45] In 1853 Anders Ångström had argued, based on general principles of resonance, that an incandescent gas should emit luminous rays of the same frequencies as those it can absorb. After this was affirmed and made more general experimentally by Tyndall and others in the early 1860s, Ångström got a lot of plaudits. When the original paper by Ångström (published in German in 1854) was published in English in 1855, the translator from the German was John Tyndall. John Charles Drury Brand (1995). Lines of light: the sources of dispersive spectroscopy, 1800–1930. CRC Press. pp. 61–. ISBN 978-2-88449-162-4.

[46] Contributions to Molecular Physics in the Domain of Radiant Heat page 428, dated 1868. When talking about chemical reactions produced by light he says "if the absorption [of radiant energy] were the act of the molecule as a whole, the relative motions of its constituent atoms would remain unchanged, and there would be no mechanical cause for their separation [in a photochemical decomposition]." Therefore in a photochemical decomposition, "it is probably the synchronism of the vibrations of one portion of the molecule with the incident waves which enables the amplitude of those vibrations to augment [i.e. resonate] until the chain which binds the parts of the molecule together is snapped asunder."

[47] Maria Yamalidou (1999). "John Tyndall, The Rhetorician of Molecularity. Part One. Crossing the Boundary towards the Invisible". Notes and Records of the Royal Society of London. 53 (2): 231–242. doi:10.1098/rsnr.1999.0077. S2CID 145674374. Maria Yamalidou (1999). "John Tyndall, The Rhetorician of Molecularity. Part Two. Questions Put to Nature". Notes and Records of the Royal Society of London. 53 (3): 319–331. doi:10.1098/rsnr.1999.0085. S2CID 144929561. See also Tyndall's popular essay "Atoms, Molecules, and Ether Waves" (year 1882) in Tyndall's book of essays for a broad audience, New Fragments.

[48] Among the hundreds of public lectures by Tyndall for non-specialist audiences at the Royal Institution, he delivered in 1861, 1863, 1865, 1867, 1869, 1871, 1873, 1875, 1877, 1879, 1882 and 1884 the annual Royal Institution Christmas Lectures for young audiences on the subjects Light; Electricity at Rest and Electricity in Motion; Sound; Heat and Cold; Light; Ice, Water, Vapour and Air; The Motion and Sensation of Sound; Experimental Electricity; Heat, Visible and Invisible; Water and Air; Light and the Eye and The Sources of Electricity, respectively. Appendix A at REF Archived 4 March 2016 at the Wayback Machine lists subject areas of other lecture series for non-experts by Tyndall at the Royal Institution over the years.

[49] During the 14 days in December 1872 when Tyndall gave public evening lectures in Manhattan, The New York Times printed news items about Tyndall on 9 of the days, some of them lengthy efforts at recapitulating what Professor Tyndall had said in his lecture the night before about the nature of light. The New York Times noted that more than half the people attending the lectures were women (which was generally true of Tyndall's lectures in London as well) and noted that the series of evening lectures about the nature of light delivered in Washington DC was attended by eminent U.S. Senators, Cabinet Ministers, and one night the U.S. President himself, accompanied by his daughter. The New York Times Archives, 4 December 1872 – 9 February 1873.

[50] Tyndall was a celebrity in the later 19th century and he was one of the people profiled in the 1878 book Celebrities at Home (2nd Series).

[51] Tyndall said in 1884: "Two factors went to the formation of a teacher. In regard to knowledge he must, of course, be master of his work.... [and secondly] a power of character must underlie and enforce the work of the intellect. There were men who could so rouse and energise their pupils – so call forth their strength and the pleasure of its exercise – as to make the hardest work agreeable. Without this power it is questionable whether the teacher could ever really enjoy his vocation; with it, I do not know a higher, nobler, and more blessed calling." New Fragments.

[52] Some of his science books were short, like 80 pages, and others were not. See the List of John Tyndall's books.

[53] A catalog of the German editions of Tyndall's books at Worldcat.org.

[54] A catalog of the French editions of Tyndall's books at Worldcat.org.

[55] Quoted from Tyndall's The Forms of Water in Clouds and Rivers, Ice and Glaciers, year 1872.

[56] John Tyndall, Sound, 3rd edition (1875).

[57] The UK publisher was Longmans. The US publisher was Appleton. Longmans kept the book in print until sometime after 1908 and Appleton until sometime after 1915. See Worldcat.org. The German publisher, Braunschweig, introduced a renewed German edition in 1894; and the French publisher, Gauthier-Villars, in 1887. In Russian the first edition was in 1864 (ref) and an updated edition came out in Russian in 1888 (ref).

[58] J. Clerk Maxwell (1871, 1872) Theory of Heat, preface page vi (publisher: Longmans, Green & Co).

[59] A review of how Tyndall demarcated science from religion, marshalling quotes from Tyndall, is in Gieryn, Thomas F. (1999). "John Tyndall's Double Boundary-Work". Cultural Boundaries of Science. The University of Chicago Press. pp. 37–64.

[60] The text of Tyndall's 1874 Belfast Address is available at Victorianweb.org. This speech got more coverage in the Victorian-era newspapers than any other single public speech in the decades-long Victorian debate over the status of evolution theory. A lengthy review of the speech and the speech's reception by London newspapers was published by The New York Times on 5 September 1874. It is downloadable. The great majority of London newspapers either endorsed Tyndall's position or took a neutral but respectful attitude towards it. Among other commentators the speech did have critics but a majority of these looked askance at subtleties and minor aspects (e.g.) Archived 7 September 2008 at the Wayback Machine, (e.g.); only a minority defended a role for religious belief in formation of knowledge. As the London Times put it when the speech was making front-page news: "It is probably part of the great change in the manners of this country that [the speech]... will now encounter little contradiction even in the most religious circles" (reprinted by New York Times, 7 Sep 1874). Among the exceptions, the Irish Catholic bishops decried it as paganism. Because the speech got widespread attention and little contradiction, and came from the Establishment post of the presidency of the British Association for the Advancement of Science, later historians have seen the speech as the "final victory" of the evolutionists in Victorian Britain. Robert M. Young (1985). Darwin's Metaphor: Nature's Place in Victorian Culture. CUP Archive. p. 257. ISBN 9780521317429.

[61] Those quotations are from the Syllabus of Errors decree (year 1864, Pope Pius IX) and the Libertas decree (year 1888, Pope Leo XIII). The Libertas decree also says: [¶27, abridged] "The divine teaching of the Church brings the sure guidance of shining light. Therefore, there is no reason why true science should feel aggrieved at having to bear the restraint of laws by which, in the judgment of the Church, human teaching has to be controlled."

[62] For Italy see Prisoner in the Vatican. Also see Don O'Leary (2006). Roman Catholicism and Modern Science: A History. Continuum International Publishing Group. pp. 57. ISBN 978-0-8264-1868-5.

[63] For a list of Tyndall's pamphlets against Irish Home Rule search both Amazon and National Library of Australia. One of the pamphlets, Mr. Gladstone's Sudden Reversal of Polarity, documented how British Prime Minister Gladstone did a flip-flop on the Home Rule question. The intent was to undermine Gladstone's intellectual credibility on the question. Gladstone publicly defended himself against the attack. The debate between them got a lot of attention in the newspapers. Tyndall was a conspicuous participant in the Irish Home Rule debate in the London newspapers between 1886 and 1893. When he died in 1893, The Times newspaper obituary noted that "our readers will remember many eloquent letters written by him of late years, full of unsparing condemnation of Mr. Gladstone's recent [Ireland] policy."

[64] More from Tyndall's letter is in the year 1891 compilation Gladstone, Ireland, Rome: A word of warning to electors (publisher: Fowler Brothers), page 119.

[65] The scientists of the British Isles were nearly unanimous in opposing Irish Home Rule, but, to Tyndall's disappointment, a majority of them also thought that the matter didn't have enough direct bearing on the vital interests of science to warrant an organized formal denunciation by them. See: Jones, Greta (2001). "Scientists against Home Rule". In Boyce, D. George; O'Day, Alan (eds.). Defenders of the Union: A Survey of British and Irish Unionism Since 1801. London: Routledge. pp. 188–208.

[TyndallOnReligion-66] The collection of Tyndall's essays where his views on religion are most clearly stated is Fragments of Science, Volume Two (also published under the title Fragments of Science for Unscientific People). It is online in HTML text format at Gutenberg.org and in other text formats at Archive.org.

[DeYoung-67] DeYoung, Ursula (2011). A Vision of Modern Science: John Tyndall and the Role of the Scientist in Victorian Culture. Palgrave Macmillan US. pp. 280. ISBN 978-0-230-11053-3. Reports that Tyndall's religious beliefs were "half-agnostic, half-deistic" (page 2) and "Tyndall viewed religion itself as both inescapable and emotionally necessary for humanity, though his conviction of religion's importance was often lost on his critics" (page 5).

[68] William Hodson Brock; Norman D. McMillan; R. Charles Mollan; Royal Dublin Society (1981). William Hodson Brock (ed.). John Tyndall, essays on a natural philosopher. Royal Dublin Society. p. 67. He did not give an answer – but he remained a confirmed agnostic.

[69] Arthur Whitmore Smith (1920). John Tyndall (1820–1893). The Science Press. p. 338. Tyndall, like most of his friends, was a reverent agnostic. He did not believe that the ultimate truths of the universe could be expressed in words, or that our limited and finite intelligence could as yet comprehend them. His writings, however, contain many phrases which show that he was familiar with the books of Holy Scripture. And often, after a Sunday evening tea, he would join his friends in the singing of psalm tunes.

[70] John Brooke; Geoffrey Cantor (2000). Reconstructing Nature: The Engagement Of Science And Religion. Continuum International Publishing Group. pp. 250 + 254. ISBN 9780567087256. Tyndall's biographers rightly insist that he was not an atheist and instead suggest that he should be labelled an agnostic since he rejected the claims of both scientists and theologians who allowed science to be debased by ungrounded speculations.

[71] John H. Lienhard (2006). How Invention Begins: Echoes of Old Voices in the Rise of New Machines. Oxford University Press. p. 204. ISBN 9780195305999. The agnostic physicist John Tyndall once remarked that Faraday drank from a fount on Sunday that refreshed his soul for a week.

[72] Simon Thompson (2011). Unjustifiable Risk?: The Story of British Climbing. Cicerone Press Limited. p. 38. ISBN 9781849653787. Tyndall was a committed agnostic who argued fiercely and frequently and once offered to fight a man who disagreed with his high opinion of Thomas Carlyle.

[73] Ronald L. Numbers; John Stenhouse, eds. (2001). Disseminating Darwinism: The Role of Place, Race, Religion, and Gender. Cambridge University Press. p. 77. ISBN 9780521011051. Free thinkers and agnostics indeed occupied chairs at Canterbury College and the University of Otago. A. W. Bickerton, professor of chemistry at Canterbury, had trained in London under militant agnostics T. H. Huxley and John Tyndall, and tirelessly popularized scientific materialism in Christchurch, to the annoyance of local Christians besides Maskell.

[74] Anthony Kenny (2005). The Unknown God: Agnostic Essays. Continuum International Publishing Group. p. 161. ISBN 9780826476340. John Tyndall, the agnostic President of the Royal Society, thus describes the view from the summit of the Weisshorn: 'An influence seemed to proceed from it direct to the soul; the delight and exultation experienced were not those of Reason or Knowledge, but of Being...'

[75] Professor Tyndall's Deed of Trust in Popular Science Monthly, May 1873. See also Prof. Tyndall's Trust in The New York Times, 8 July 1885.

[76] Gladstone's Home Rule. The New York Times, 25 June 1892.

[77] The value of Tyndall's estate at probate was £22,122: biography of John Tyndall by W. M. Brock in Oxford Dictionary of National Biography (2004). Some ways to assess today the magnitude of £22,122 wealth in 1893 are at MeasuringWorth.com.

[78] Haia Shpayer-Makov. "A Work-Life History of Policemen in Victorian and Edwardian England" (PDF). University of Haifa, Israel. p. 10.

[79] In late years he was taking magnesia for dyspepsia and chloral hydrate for insomnia. His wife, who administered the drugs, accidentally gave him none of the former and a lethal overdose of the latter. A newspaper report of Mrs. Tyndall's testimony at the coroner's inquest: "Mrs. Tyndall's Fatal Error". The New York Times. 25 December 1893.

[80] Edward Frankland (1894). "Obituary Notice of John Tyndall". Proceedings of the Royal Society of London. 55: xviii–xxxiv.

[81] Dry, Sandra (2018). "A long-awaited biography does justice to John Tyndall, a pioneering climate researcher and science advocate". Science. 360: 1307. doi:10.1126/science.aat6293. S2CID 49357758.

[82] Louisa Tyndall wanted a collaborator, but was unsatisfied with all candidates. Later, according to Crowther, she would only accept one who would live in her own house, and none such was found. Crowther, J. G. (1968). Scientific Types. London: Barrie & Rockliff, The Crescent Press Ltd. pp. 187–188. ISBN 9780248997294.

[83] "Tyndalldenkmal". map.geo.admin.ch. Swiss Confederation. Retrieved 10 April 2019.

[84] The short book On Radiation (1865) was wholly incorporated into the long book Fragments of Science (1871).

[85] The short book Scientific Addresses was published in America only. It consisted of three speeches delivered in Britain in 1868–1870. Partly published in Britain in the short book entitled Essays on the Use and Limit of the Imagination in Science. Some of this material was republished in the Fragments of Science collection.

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@@ Line 1: / Line 1: @@
-{{short description|Irish physicist and mountaineer (1820–1893)}}
+{{short description|Irish physicist and chemist (1820–1893)}}
 {{About|the scientist|the far-right activist|John Tyndall (far-right activist)|the Canadian poet|John Tyndall (poet)}}
+{{Multiple issues|
-{{EngvarB|date=March 2018}}
+{{more citations needed|date=September 2024}}
+{{POV|date=September 2024}}
+}}
+{{Use British English|date=March 2018}}
 {{Use dmy dates|date=March 2018}}
 {{Infobox scientist
+| honorific_suffix  = {{post-nominals|size=100%|FRS}}
-| name              = John Tyndall
+| image             = John Tyndall portrait mid career.jpg
-| honorific_suffix = [[Fellowship of the Royal Society|FRS]]
+| birth_date        = {{birth date|df=y|1820|8|2}}
-| image             = JohnTyndall(1820-1893),Engraving,SIL14-T003-09a_cropped.jpg
+| birth_place       = [[Leighlinbridge]], [[County Carlow|Carlow]], Ireland
-| birth_date        = {{birth date|df=y|1820|08|2}}
+| death_date        = {{death date and age|df=y|1893|12|4|1820|8|2}}
-| birth_place       = [[Leighlinbridge]], [[County Carlow]], Ireland
+| death_place       = [[Haslemere]], [[Surrey]], England
-| death_date        = {{Death date|df=y|1893|12|4}} (aged 73)
-| death_place       = [[Haslemere]], [[Surrey]], England, UK
-| residence         =
-| nationality       = Irish
-| ethnicity         =
-| field             = [[Physics]], [[chemistry]]
-| work_institution  = [[Royal Institution of Great Britain]]
 | alma_mater        = [[University of Marburg]]
+| known_for         = {{ubl|[[Spontaneous generation#Pasteur and Tyndall|Disproving spontaneous generation theory]]|[[Tyndall's bar breaker]]|[[Tyndall effect]]|[[Tyndallization]]|[[Capnography]]|[[Greenhouse effect]]|[[Heat]]|[[Respirator]]|[[Thermophoresis]]|[[Water vapor windows]]|Coining the term ''[[calorescence]]''}}
-| doctoral_advisor  =
+| spouse            = {{marriage|[[Louisa Charlotte Tyndall|Louisa Charlotte Hamilton]]|1876}}
-| doctoral_students = [[Mihajlo Pupin|Mihajlo Idvorski Pupin]]<ref>{{Cite web|url=https://telhistory.ru/telephone_history/inostrannye-izobretateli/mikhail-pupin/|title = Музей истории телефона - История телефона}}</ref><ref>Pupin, Michael. From immigrant to inventor. — New York, London: Charles Scribner's Sons, 1949. — p. 200. — 396 p.</ref>
+| awards            = {{ubl|[[Fellow of the Royal Society|FRS]] (1852)|[[Royal Medal]] (1853)|[[Royal Society Bakerian Medal|Bakerian Medal]] (1855, 1861, 1864, 1881)|[[Rumford Medal]] (1864)}}
-| known_for         = [[Atmosphere]], [[physics education]], <br /> [[Tyndall effect]], [[diamagnetism]], <br />[[infrared radiation]], [[Tyndallization]]
-| prizes            = [[Royal Medal]] {{small|(1853)}}<br />[[Rumford Medal]] {{small|(1864)}}
+| fields            = [[Physics]]<br>[[Chemistry]]
+| work_institutions = [[Royal Institution]]<br>[[University of Cambridge]]
-| footnotes         =
+| academic_advisors = [[Robert Bunsen]]<br>[[Hermann Knoblauch]]
+| notable_students  = [[Mihajlo Pupin]]<ref>{{Cite web|url=https://telhistory.ru/telephone_history/inostrannye-izobretateli/mikhail-pupin/|title = Музей истории телефона - История телефона}}</ref><ref>Pupin, Michael. From immigrant to inventor. — New York, London: Charles Scribner's Sons, 1949. — p. 200. — 396 p.</ref>
 | signature         = JohnTyndallSignature.png
 }}
-'''John Tyndall''' [[Fellow of the Royal Society|<small>FRS</small>]] ({{IPAc-en|ˈ|t|ɪ|n|d|əl}}; 2 August 1820 – 4 December 1893) was a prominent 19th-century Irish physicist. His scientific fame arose in the 1850s from his study of [[diamagnetism]]. Later he made discoveries in the realms of [[infrared radiation]] and the physical properties of air, proving the connection between atmospheric [[Carbon dioxide|CO{{sub|2}}]] and what is now known as the [[greenhouse effect]] in 1859.
+'''John Tyndall''' ({{IPAc-en|ˈ|t|ɪ|n|d|əl}}; 2 August 1820 – 4 December 1893) was an Irish [[physicist]] and [[chemist]]. His scientific fame arose in the 1850s from his study of [[diamagnetism]]. Later he made discoveries in the realms of [[infrared radiation]] and the physical properties of air, proving the connection between atmospheric [[Carbon dioxide|CO{{sub|2}}]] and what is now known as the [[greenhouse effect]] in 1859.
 Tyndall also published more than a dozen science books which brought state-of-the-art 19th century [[experimental physics]] to a wide audience. From 1853 to 1887 he was professor of physics at the [[Royal Institution of Great Britain]] in London. He was elected as a member to the [[American Philosophical Society]] in 1868.<ref>{{Cite web|title=APS Member History|url=https://search.amphilsoc.org/memhist/search?creator=&title=&subject=&subdiv=&mem=&year=1868&year-max=1868%5C&dead=&keyword=&smode=advanced|access-date=2021-04-26|website=search.amphilsoc.org}}</ref>
@@ Line 40: / Line 40: @@
 [[File:Tyndall 1896 Figure 7-37-MJ2.jpg|thumb|300px|John Tyndall explored the glacial tributaries feeding [[Mer de Glace]] in 1857. General topology (left); dirt-bands in glacier (right).]]
-In the Alps, Tyndall studied [[glacier]]s, and especially [[glacier motion]]. His explanation of glacial flow brought him into dispute with others, particularly [[James David Forbes]]. Much of the early scientific work on glacier motion had been done by Forbes, but Forbes at that time did not know of the phenomenon of [[regelation]], which was discovered a little later by Michael Faraday. Regelation played a key role in Tyndall's explanation. Forbes did not see regelation in the same way at all. Complicating their debate, a disagreement arose publicly over who deserved to get investigator credit for what. Articulate friends of Forbes, as well as Forbes himself, thought that Forbes should get the credit for most of the good science, whereas Tyndall thought the credit should be distributed more widely. Tyndall commented: "The idea of semi-fluid motion belongs entirely to [[Louis Rendu]]; the proof of the quicker central flow belongs in part to Rendu, but almost wholly to [[Louis Agassiz]] and Forbes; the proof of the retardation of the bed belongs to Forbes alone; while the discovery of the locus of the point of maximum motion belongs, I suppose, to me."<ref>That quotation from Tyndall appears in the ''[[1911 Encyclopædia Britannica]]'' article about Tyndall. For Forbes' view of the issue see "Appendix A" (plus Chapter XV) of ''[https://archive.org/details/lifelettersofjam00shaiuoft Life and Letters of James David Forbes]''.</ref> When Forbes and Tyndall were in the grave, their disagreement was continued by their respective official biographers. Everyone tried to be reasonable, but agreement was not attained. More disappointingly, aspects of glacier motion remained not understood or not proved.
+In the Alps, Tyndall studied [[glacier]]s, and especially [[glacier motion]]. His explanation of glacial flow brought him into dispute with others, particularly [[James David Forbes]]. Much of the early scientific work on glacier motion had been done by Forbes, but Forbes at that time did not know of the phenomenon of [[regelation]], which was discovered a little later by Michael Faraday. Regelation played a key role in Tyndall's explanation. Forbes did not see regelation in the same way at all. Complicating their debate, a disagreement arose publicly over who deserved to get investigator credit for what. Articulate friends of Forbes, as well as Forbes himself, thought that Forbes should get the credit for most of the good science, whereas Tyndall thought the credit should be distributed more widely. Tyndall commented: "The idea of semi-fluid motion belongs entirely to [[Louis Rendu]]; the proof of the quicker central flow belongs in part to Rendu, but almost wholly to [[Louis Agassiz]] and Forbes; the proof of the retardation of the bed belongs to Forbes alone; while the discovery of the locus of the point of maximum motion belongs, I suppose, to me."<ref>That quotation from Tyndall appears in {{harvtxt|Chisholm|1911}}. For Forbes' view of the issue see "Appendix A" (plus Chapter XV) of ''[https://archive.org/details/lifelettersofjam00shaiuoft Life and Letters of James David Forbes]''.</ref> When Forbes and Tyndall were in the grave, their disagreement was continued by their respective official biographers. Everyone tried to be reasonable, but agreement was not attained. More disappointingly, aspects of glacier motion remained not understood or not proved.
 Numerous landforms and geographical features are named for John Tyndall, including [[Tyndall Glacier (Chile)|Tyndall Glacier]] in [[Chile]], [[Tyndall Glacier (Colorado)|Tyndall Glacier]] in [[Colorado]], [[Tyndall Glacier (Alaska)|Tyndall Glacier]] in [[Alaska]],<ref>{{Cite web |title=Geographic Names Information System |url=https://edits.nationalmap.gov/apps/gaz-domestic/public/summary/1411466 |access-date=2022-07-28 |website=edits.nationalmap.gov}}</ref> [[Mount Tyndall]] in [[California]],<ref>{{cite journal | author = Brewer, William H. | title = Discovery of Mount Tyndall | journal = The Popular Science Monthly | year = 1873 | volume = 2 | pages = 739–741 | url = http://en.wikisource.org/wiki/Popular_Science_Monthly/Volume_2/April_1873/Discovery_of_Mount_Tyndall }}</ref> and [[Mount Tyndall (Tasmania)|Mount Tyndall]] in [[Tasmania]].<ref>{{cite journal | author = Haast, Julius | title = Notes on the Mountains and Glaciers of the Canterbury Province, New Zealand | journal = [[Journal of the Royal Geographical Society of London]] | year = 1864 | volume = 34 | pages = 87–96 | url = https://books.google.com/books?id=JOoRAAAAYAAJ&q=Mount+Tyndall&pg=PA89 | jstor = 1798467 | doi = 10.2307/1798467 }}</ref>
 ==Main scientific work==
-Work on glaciers alerted Tyndall to the research of [[Horace Bénédict de Saussure|de Saussure]] into the heating effect of sunlight, and the concept of [[Joseph Fourier|Fourier]], developed by [[Claude Pouillet|Pouillet]] and [[William Hopkins]]; that heat from the sun penetrates the atmosphere more easily than "obscure heat" ([[infrared]])  "terrestrial radiation" from the warmed Earth, causing what we now call the [[greenhouse effect]]. In the spring of 1859, Tyndall began research into how [[thermal radiation]], both visible and obscure, affects different gases and aerosols. He developed differential [[absorption spectroscopy]] using the electro-magnetic [[thermopile]] devised by [[Macedonio Melloni|Melloni]]. Tyndall began intensive experiments on 9 May 1859, at first without significant results,
+Work on glaciers alerted Tyndall to the research of [[Horace Bénédict de Saussure]] into the heating effect of sunlight, and the concept of [[Joseph Fourier|Jospeph Fourier]], developed by [[Claude Pouillet]] and [[William Hopkins]], that heat from the sun penetrates the atmosphere more easily than "obscure heat" ([[infrared]])  "terrestrial radiation" from the warmed Earth, causing what we now call the [[greenhouse effect]]. In the spring of 1859, Tyndall began research into how [[thermal radiation]], both visible and obscure, affects different gases and aerosols. He developed differential [[absorption spectroscopy]] using the electro-magnetic [[thermopile]] devised by [[Macedonio Melloni]]. Tyndall began intensive experiments on 9 May 1859, at first without significant results,
 <ref name="Tyndall Bakerian">{{cite journal |first=John |last=Tyndall | title=I. The Bakerian Lecture.—On the Absorption and Radiation of Heat by Gases and Vapours, and on the Physical Connexion of Radiation, Absorption, and Conduction | journal=Philosophical Transactions of the Royal Society of London | publisher=The Royal Society | volume=151 | date=31 December 1861 | issn=0261-0523 | doi=10.1098/rstl.1861.0001 | pages=[https://books.google.com/books?id=D1dKAQAAMAAJ&pg=PA1 1–36] |quote=Received January 10, Read February 7, 1861| doi-access=free }}</ref><ref name="Climate Lab Book">{{cite web |first=Roland|last=Jackson | title=John Tyndall: founder of climate science? | website=Climate Lab Book | url=https://www.climate-lab-book.ac.uk/2018/john-tyndall-founder-of-climate-science/ | access-date=12 March 2020}}</ref> then improved the sensitivity of the apparatus and on 18 May wrote in his journal "Experimented all day; the subject is completely in my hands!" On 26 May he gave the [[Royal Society]] a note which described his methods, and stated "With the exception of the celebrated memoir of M. Pouillet on Solar Radiation through the atmosphere, nothing, so far as I am aware, has been published on the transmission of radiant heat through gaseous bodies. We know nothing of the effect even of air upon heat radiated from terrestrial sources."<ref name="RI who discovered">{{cite web|first=Roland|last=Jackson | title=Who discovered the greenhouse effect? | website=The Royal Institution: Science Lives Here | date=5 March 2020 | url=https://www.rigb.org/blog/2019/may/who-discovered-the-greenhouse-effect | access-date=12 March 2020}} Note; it is now appreciated that in 1856 [[Eunice Newton Foote|Eunice Foote]] had published experiments on how the sun's rays heated gases, giving evidence that {{co2}} and [[water vapour]] [[heat absorption|absorbed heat]], and speculated that changes in their proportions could affect [[climate]], but she did not differentiate the effects of [[infrared]] heat.</ref><ref name="The Royal Society pp. 37–39">{{cite journal |first=John |last=Tyndall | title=VII. Note on the transmission of radiant heat through gaseous bodies | journal=Proceedings of the Royal Society of London | publisher=The Royal Society | volume=10 | date=31 December 1860 | issn=0370-1662 | doi=10.1098/rspl.1859.0017 | pages=[https://books.google.com/books?id=amlr21axjUAC&pg=PA37 37–39]|quote=Received May 26, 1859| doi-access=free }}</ref>
@@ Line 54: / Line 54: @@
 * Tyndall explained the heat in the Earth's atmosphere in terms of the capacities of the various gases in the air to absorb radiant heat, in the form of infrared radiation. His measuring device, which used [[thermopile]] technology, is an early landmark in the history of [[absorption spectroscopy]] of gases.<ref>Details of Tyndall's device for measuring the infrared absorptive power of a gas are described in {{cite book | author = James Rodger Fleming | title = Historical Perspectives on Climate Change | year = 2005 | publisher = Oxford University Press | pages = 69–70 | url = https://books.google.com/books?id=09RtcSCGv7gC&pg=PA69| isbn = 978-0-19-518973-5}} Greater details are in Chapter I of Tyndall's own book ''[https://archive.org/details/contributionsto01tyndgoog Contributions to Molecular Physics in the Domain of Radiant Heat]''.</ref> He was the first to correctly measure the relative infrared absorptive powers of the gases [[nitrogen]], [[oxygen]], water vapour, [[carbon dioxide]], [[ozone]], [[methane]], and other trace gases and vapours. He concluded that [[water vapour]] is the strongest absorber of radiant heat in the atmosphere and is the principal gas controlling air temperature. Absorption by the other gases is not negligible but relatively small. Prior to Tyndall it was widely surmised that the Earth's atmosphere warms the surface in what was later called a [[greenhouse effect]], but he was the first to prove it. The proof was that water vapour strongly absorbed infrared radiation.<ref name="Baum">{{cite journal|last1=Baum|first1=Rudy M. Sr.|title=Future Calculations: The first climate change believer|journal=Distillations|date=2016|volume=2|issue=2 |pages=38–39 |url=https://www.sciencehistory.org/distillations/magazine/future-calculations|access-date=22 March 2018}}</ref><ref>Tyndall explained the "greenhouse effect" in a public lecture in January 1863 entitled "On Radiation Through The Earth's Atmosphere". He emphasized that our environment would be much colder at nighttime in the absence of the greenhouse effect. This short, readable lecture is reprinted in his 1872 book about radiant heat, [https://archive.org/stream/contributionsto01tyndgoog#page/n441/mode/1up available here].</ref> Three years earlier, in 1856, the American scientist [[Eunice Newton Foote]] had announced experiments demonstrating that water vapour and carbon dioxide absorb heat from solar radiation, but she did not differentiate the effects of infrared.<ref name="RI who discovered" /><ref>{{Cite journal|last=Jackson|first=Roland|date=2020-03-20|title=Eunice Foote, John Tyndall and a question of priority|journal=Notes and Records: The Royal Society Journal of the History of Science|volume=74|issue=1|pages=105–118|doi=10.1098/rsnr.2018.0066|s2cid=186208096|doi-access=free}}</ref> Relatedly, Tyndall in 1860 was first to demonstrate and quantify that visually transparent gases are infrared emitters.<ref name=InfraredEmissionByGases />
 * He devised demonstrations that advanced the question of how radiant heat is absorbed and emitted at the molecular level. He appears to be the first person to have demonstrated experimentally that emission of heat in chemical reactions has its physical origination within the newly created molecules (1864).<ref name=MolecularPhysicsInDomainOfRadiantHeat /> He produced instructive demonstrations involving the incandescent conversion of infrared into visible light at the molecular level, which he called [[calorescence]] (1865), in which he used materials that are transparent to infrared and opaque to visible light or vice versa.<ref>See [[calorescence]].</ref> He usually referred to infrared as "radiant heat", and sometimes as "ultra-red undulations", as the word "infrared" did not start coming into use until the 1880s. His main reports of the 1860s were republished as a 450-page collection in 1872 under the title ''Contributions to Molecular Physics in the Domain of Radiant Heat''.
-* In the investigations on radiant heat in air it had been necessary to use air from which all traces of floating dust and other [[Atmospheric particulate matter|particulates]] had been removed.<ref>Reported in a 10-page biography of John Tyndall by Arthur Whitmore Smith, a professor of physics, writing in an American scientific monthly in 1920; [https://archive.org/stream/contributions05michuoft#page/n90/mode/1up available online].</ref> A very sensitive way to detect particulates is to bathe the air with intense light. The scattering of light by particulate impurities in air and other gases, and in liquids, is known today as the [[Tyndall Effect]] or Tyndall Scattering.<ref>The term [[Tyndall Scattering]] is subject to some definitional overlap with the terms [[Rayleigh Scattering]] and [[Mie Scattering]].</ref> In studying this scattering during the late 1860s Tyndall was a beneficiary of recent improvements in electric-powered lights. He also had the use of good light concentrators. He developed the [[nephelometer]] and similar instruments that show properties of [[aerosols]] and [[colloids]] through concentrated light beams against a dark background and are based on exploiting the Tyndall Effect. (When combined with microscopes, the result is the [[ultramicroscope]], which was developed later by others).
+* In the investigations on radiant heat in air it had been necessary to use air from which all traces of floating dust and other [[Atmospheric particulate matter|particulates]] had been removed.<ref>Reported in a 10-page biography of John Tyndall by Arthur Whitmore Smith, a professor of physics, writing in an American scientific monthly in 1920; [https://archive.org/stream/contributions05michuoft#page/n90/mode/1up available online].</ref> A very sensitive way to detect particulates is to bathe the air with intense light. The scattering of light by particulate impurities in air and other gases, and in liquids, is known today as the [[Tyndall effect]] or Tyndall scattering.<ref>The term [[Tyndall Scattering]] is subject to some definitional overlap with the terms [[Rayleigh Scattering]] and [[Mie Scattering]].</ref> In studying this scattering during the late 1860s Tyndall was a beneficiary of recent improvements in electric-powered lights. He also had the use of good light concentrators. He developed the [[nephelometer]] and similar instruments that show properties of [[aerosols]] and [[colloids]] through concentrated light beams against a dark background and are based on exploiting the Tyndall effect. (When combined with microscopes, the result is the [[ultramicroscope]], which was developed later by others).
-* He was the first to observe and report the phenomenon of [[thermophoresis]] in aerosols. He spotted it surrounding hot objects while investigating the Tyndall Effect with focused lightbeams in a dark room. He devised a better way to demonstrate it, and then simply reported it (1870), without investigating the physics of it in depth.<ref>A brief account of the early history of thermophoresis studies is given in ''Encyclopedia of Surface and Colloid Science'', 2nd edition, year 2006, pages 6274–6275. Thermophoresis was first described by Tyndall in a Royal Institution lecture titled [https://archive.org/stream/scientificaddre01tyndgoog#page/n23/mode/1up "On Haze and Dust"], year 1870, which is included in Tyndall's 1870 book ''Scientific Addresses''. He observed the thermophoresis in gas mixtures. Unrelatedly and unknown to him, thermophoresis was observed in liquid mixtures in 1856 by [[Carl Ludwig]].</ref>
+* He was the first to observe and report the phenomenon of [[thermophoresis]] in aerosols. He spotted it surrounding hot objects while investigating the Tyndall effect with focused lightbeams in a dark room. He devised a better way to demonstrate it, and then simply reported it (1870), without investigating the physics of it in depth.<ref>A brief account of the early history of thermophoresis studies is given in ''Encyclopedia of Surface and Colloid Science'', 2nd edition, year 2006, pages 6274–6275. Thermophoresis was first described by Tyndall in a Royal Institution lecture titled [https://archive.org/stream/scientificaddre01tyndgoog#page/n23/mode/1up "On Haze and Dust"], year 1870, which is included in Tyndall's 1870 book ''Scientific Addresses''. He observed the thermophoresis in gas mixtures. Unrelatedly and unknown to him, thermophoresis was observed in liquid mixtures in 1856 by [[Carl Ludwig]].</ref>
 * In radiant-heat experiments that called for much laboratory expertise in the early 1860s, he showed for a variety of readily vaporisable liquids that, molecule for molecule, the vapour form and the liquid form have essentially the same power to absorb radiant heat.<ref>''[https://archive.org/details/contributionsto01tyndgoog Contributions to Molecular Physics in the Domain of Radiant Heat]'' pages 199–214, dated 1863. Those experiments demanded "scrupulous accuracy, and minute attention to details", he later said [https://archive.org/stream/newfragments00tynd/#page/91/mode/1up (ref)]. In one of his other and simpler experiments, infrared plus visible light beaming from an 1860s-vintage electric lamp was brought to a focus point via a powerful concave mirror. On its way to the focus point, the beam was passed through a body of liquid water. At the focus point, beyond the water, the beam was able to set wood on fire but was not able to melt frozen water. On removal of the intervening body of liquid water, the frozen water rapidly melted. This indicates that frequencies emerging from water are specifically frequencies that water molecules do not absorb and water's [[State of matter|phase state]] does not have a discernible role. ''Contributions to Molecular Physics'' page 314 (year 1865); and [https://archive.org/stream/fragmscience01tyndrich/#page/84/mode/1up ref] page 84-85 (year 1866).</ref> (In modern experiments using narrow-band spectra, some small differences are found that Tyndall's equipment was unable to get at; see e.g. [[Electromagnetic absorption by water|absorption spectrum of H<sub>2</sub>O]]).
-* He consolidated and enhanced the results of [[Paul-Quentin Desains|Desains]], [[James David Forbes|Forbes]], [[Hermann Knoblauch|Knoblauch]] and others demonstrating that the principal properties of visible light can be reproduced for radiant heat – namely reflection, refraction, diffraction, polarisation, depolarisation, double refraction, and rotation in a magnetic field.<ref>{{cite journal|author1=James W. Gentry |author2=Lin Jui-Chen |title=The Legacy of John Tyndall in Aerosol Science|volume= 27|pages=S503–S504|year= 1996|doi=10.1016/0021-8502(96)00324-2|quote=Tyndall's primary contributions were...[among other things]... the design of experiments which increased the deflections of the galvanometer by two orders of magnitude from the earlier measurements for double refraction (by Knoblauch) and the [[Faraday effect]] (by de la Provostaye and Desains). |journal=Journal of Aerosol Science|bibcode=1996JAerS..27S.503G}} Tyndall's presentation of the subject begins under the heading "The Identity of Light and Radiant Heat" in his 1873 tutorial book ''[https://archive.org/stream/sixlecturesonlig00tyndrich#page/179/mode/1up Six Lectures on Light]''.</ref>
+* He consolidated and enhanced the results of [[Paul-Quentin Desains]], [[James David Forbes|James D. Forbes]], [[Hermann Knoblauch]] and others demonstrating that the principal properties of visible light can be reproduced for radiant heat – namely reflection, refraction, diffraction, polarisation, depolarisation, double refraction, and rotation in a magnetic field.<ref>{{cite journal|author1=James W. Gentry |author2=Lin Jui-Chen |title=The Legacy of John Tyndall in Aerosol Science|volume= 27|pages=S503–S504|year= 1996|doi=10.1016/0021-8502(96)00324-2|quote=Tyndall's primary contributions were...[among other things]... the design of experiments which increased the deflections of the galvanometer by two orders of magnitude from the earlier measurements for double refraction (by Knoblauch) and the [[Faraday effect]] (by de la Provostaye and Desains). |journal=Journal of Aerosol Science|bibcode=1996JAerS..27S.503G}} Tyndall's presentation of the subject begins under the heading "The Identity of Light and Radiant Heat" in his 1873 tutorial book ''[https://archive.org/stream/sixlecturesonlig00tyndrich#page/179/mode/1up Six Lectures on Light]''.</ref>
 * Using his expertise about radiant heat absorption by gases, he invented a system for measuring the amount of carbon dioxide in a sample of exhaled human breath (1862, 1864). The basics of Tyndall's system is in daily use in hospitals today for monitoring patients under [[anaesthesia]].<ref>{{cite journal|url=http://www.anesthesia-analgesia.org/cgi/reprint/107/3/890.pdf |title=Infrared Measurement of Carbon Dioxide in the Human Breath: Breathe-Through Devices from Tyndall to the Present Day|author=Michael B. Jaffe|journal=Anesthesia & Analgesia| volume=107|pages=890–904|year= 2008|doi=10.1213/ane.0b013e31817ee3b3|pmid=18713902|issue=3 |s2cid=15610449}} See also John Tyndall, [https://archive.org/details/contributionsto01tyndgoog ''Contributions to Molecular Physics in the Domain of Radiant Heat''], §4 of Chapter II (dated 1862) and §13 of Chapter VI (dated 1864).</ref> (See [[capnometry]].)
 * When studying the absorption of radiant heat by [[ozone]], he came up with a demonstration that helped confirm or reaffirm that ozone is an oxygen cluster (1862).<ref>Tyndall's experiment on ozone is in sections 17–19 of "Further Researches on the Absorption and Radiation of Heat by Gaseous Matter", dated January 1862; [https://archive.org/stream/contributionsto03tyndgoog#page/n128/mode/1up online]. Some biographical sketches of Tyndall state that Tyndall "showed that ozone was an oxygen cluster rather than a hydrogen compound" (this statement is at [http://todayinsci.com/12/12_04.htm ''Today in Science History''] and [http://www.eoearth.org/article/Tyndall,_John ''The Encyclopedia of Earth''], for example). But it is an overstatement, because other researchers had already shown at an earlier date that ozone was an oxygen cluster. Tyndall's experiment just helped to reaffirm it by a different method. For background historical context see [http://www.scs.uiuc.edu/~mainzv/HIST/awards/OPA%20Papers/2001-Rubin.pdf "The History of Ozone 1839&nbsp;– 1868"] {{Webarchive|url=https://web.archive.org/web/20080411012834/http://www.scs.uiuc.edu/~mainzv/HIST/awards/OPA%20Papers/2001-Rubin.pdf |date=11 April 2008 }}, by Mordecai B. Rubin (2001).</ref>
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 As an indicator of his teaching attitude, here are his concluding remarks to the reader at the end of a 200-page tutorial book for a "youthful audience", ''The Forms of Water'' (1872): "Here, my friend, our labours close. It has been a true pleasure to me to have you at my side so long. In the sweat of our brows we have often reached the heights where our work lay, but you have been steadfast and industrious throughout, using in all possible cases your own muscles instead of relying upon mine. Here and there I have stretched an arm and helped you to a ledge, but the work of climbing has been almost exclusively your own. It is thus that I should like to teach you all things; showing you the way to profitable exertion, but leaving the exertion to you.... Our task seems plain enough, but you and I know how often we have had to wrangle resolutely with the facts to bring out their meaning. The work, however, is now done, and you are master of a fragment of that sure and certain knowledge which is founded on the faithful study of nature.... Here then we part. And should we not meet again, the memory of these days will still unite us. Give me your hand. Good bye."<ref>Quoted from Tyndall's ''[https://archive.org/stream/formsofwaterincl00tyndiala#page/190/mode/2up The Forms of Water in Clouds and Rivers, Ice and Glaciers]'', year 1872.</ref>
+[[File:John_Tyndall_-_1863_-_Pictet%27s_experiment.jpg|alt=An etching by John Tyndall illustrating 'Pictet's Experiment' which shows the reflection of radiant heat from a source in the bottom mirror focused on a blackened balloon filled with Hydrogen and Oxygen which explodes when the source is applied.|left|thumb|Tydall's illustration of [[Pictet's experiment]]]]
 As another indicator, here is the opening paragraph of his 350-page tutorial entitled ''Sound'' (1867): "In the following pages I have tried to render the science of acoustics interesting to all intelligent persons, including those who do not possess any special scientific culture. The subject is treated experimentally throughout, and I have endeavoured so to place each experiment before the reader that he should realise it as an actual operation." In the preface to the 3rd edition of this book, he reports that earlier editions were translated into Chinese at the expense of the Chinese government and translated into German under the supervision of [[Hermann von Helmholtz]] (a big name in the science of acoustics).<ref>John Tyndall, [https://archive.org/details/sound05tyndgoog ''Sound'', 3rd edition (1875)].</ref> His first published tutorial, which was about glaciers (1860), similarly states: "The work is written with a desire to interest intelligent persons who may not possess any special scientific culture."
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 [[File:John Tyndall, 1872.jpg|thumb|upright|Tyndall caricatured as a preacher in the magazine ''[[Vanity Fair (UK magazine)|Vanity Fair]]'', 1872.]]
-The majority of the progressive and innovative British physicists of Tyndall's generation were conservative and orthodox on matters of religion. That includes for example [[James Joule]], [[Balfour Stewart]], [[James Clerk Maxwell]], [[George Gabriel Stokes]] and [[William Thomson, 1st Baron Kelvin|William Thomson]] – all names investigating heat or light contemporaneously with Tyndall. These conservatives believed, and sought to strengthen the basis for believing, that religion and science were consistent and harmonious with each other. Tyndall, however, was a member of a [[X Club|club]] that vocally supported [[Charles Darwin]]'s theory of evolution and sought to strengthen the barrier, or separation, between religion and science. The most prominent member of this club was the anatomist [[Thomas Henry Huxley]]. Tyndall first met Huxley in 1851 and the two had a lifelong friendship. Chemist [[Edward Frankland]] and mathematician [[Thomas Archer Hirst]], both of whom Tyndall had known since before going to university in Germany, were members too. Others included the social philosopher [[Herbert Spencer]].
+The majority of the progressive and innovative British physicists of Tyndall's generation were conservative and orthodox on matters of religion. That includes for example [[James Joule]], [[Balfour Stewart]], [[James Clerk Maxwell]], [[George Gabriel Stokes]] and [[Lord Kelvin]] – all names investigating heat or light contemporaneously with Tyndall. These conservatives believed, and sought to strengthen the basis for believing, that religion and science were consistent and harmonious with each other. Tyndall, however, was a member of a [[X Club|club]] that vocally supported [[Charles Darwin]]'s theory of evolution and sought to strengthen the barrier, or separation, between religion and science. The most prominent member of this club was the anatomist [[Thomas Henry Huxley]]. Tyndall first met Huxley in 1851 and the two had a lifelong friendship. Chemist [[Edward Frankland]] and mathematician [[Thomas Archer Hirst]], both of whom Tyndall had known since before going to university in Germany, were members too. Others included the social philosopher [[Herbert Spencer]].
 Though not nearly so prominent as Huxley in controversy over philosophical problems, Tyndall played his part in communicating to the educated public what he thought were the virtues of having a clear separation between science (knowledge & rationality) and religion (faith & spirituality).<ref>A review of how Tyndall demarcated science from religion, marshalling quotes from Tyndall, is in {{Cite book |last=Gieryn |first=Thomas F. |title=Cultural Boundaries of Science |publisher=The University of Chicago Press |year=1999 |pages=37–64 |contribution=John Tyndall's Double Boundary-Work |contribution-url=https://books.google.com/books?id=GljD3CHbDx0C&pg=PA37}}</ref> As the elected president of the [[British Association for the Advancement of Science]] in 1874, he gave a long [[keynote speech]] at the Association's annual meeting held that year in Belfast. The speech gave a favourable account of the history of evolutionary theories, mentioning Darwin's name favourably more than 20 times, and concluded by asserting that religious sentiment should not be permitted to "intrude on the region of ''knowledge'', over which it holds no command". This was a hot topic. The newspapers carried the report of it on their front pages – in Britain, Ireland & North America, even the European Continent – and many critiques of it appeared soon after. The attention and scrutiny increased the friends of the evolutionists' philosophical position, and brought it closer to mainstream ascendancy.<ref>The text of Tyndall's 1874 ''Belfast Address'' is available at [http://www.victorianweb.org/science/science_texts/belfast.html Victorianweb.org]. This speech got more coverage in the Victorian-era newspapers than any other single public speech in the decades-long Victorian debate over the status of evolution theory. A lengthy review of the speech and the speech's reception by London newspapers was published by ''The New York Times'' on 5 September 1874. It is [https://query.nytimes.com/gst/abstract.html?res=9D06E4DE1E39EF34BC4D53DFBF66838F669FDE downloadable]. The great majority of London newspapers either endorsed Tyndall's position or took a neutral but respectful attitude towards it. Among other commentators the speech did have critics but a majority of these looked askance at subtleties and minor aspects [http://www.gkbenterprises.org.uk/thesis/ch05.htm#fnote61anc (e.g.)] {{webarchive|url=https://web.archive.org/web/20080907075712/http://www.gkbenterprises.org.uk/thesis/ch05.htm|date=7 September 2008}}, [[iarchive:ideasinnatureove00mcco|(e.g.)]]; only a minority defended a role for religious belief in formation of knowledge. As the London ''Times'' put it when the speech was making front-page news: "It is probably part of the great change in the manners of this country that [the speech]... will now encounter little contradiction even in the most religious circles" (reprinted by [https://timesmachine.nytimes.com/timesmachine/1874/09/07/79081649.pdf ''New York Times'', 7 Sep 1874]). Among the exceptions, the Irish Catholic bishops decried it as paganism. Because the speech got widespread attention and little contradiction, and came from the Establishment post of the presidency of the British Association for the Advancement of Science, later historians have seen the speech as the "final victory" of the evolutionists in Victorian Britain. {{cite book |author=Robert M. Young |url=https://books.google.com/books?id=JWk5AAAAIAAJ&pg=RA1-PA257 |title=Darwin's Metaphor: Nature's Place in Victorian Culture |publisher=CUP Archive |year=1985 |isbn=9780521317429 |page=257}}</ref>
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 In Rome in 1864, [[Pope Pius IX]] in his ''[[Syllabus of Errors]]'' decreed that it was an ''error'' that "reason is the ultimate standard by which man can and ought to arrive at knowledge" and an ''error'' that "divine revelation is imperfect" in the Bible – and anyone maintaining those errors was to be "[[anathematized]]" – and in 1888 decreed as follows: "The fundamental doctrine of rationalism is the supremacy of the human reason, which, refusing due submission to the divine and eternal reason, proclaims its own independence... A doctrine of such character is most hurtful both to individuals and to the State... It follows that it is quite unlawful to demand, to defend, or to grant, unconditional [or promiscuous] freedom of thought, speech, writing, or religion."<ref>Those quotations are from the [[s:The Syllabus of Errors|''Syllabus of Errors'']] decree (year 1864, [[Pope Pius IX]]) and the [https://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_20061888_libertas_en.html ''Libertas''] decree (year 1888, [[Pope Leo XIII]]). The ''Libertas'' decree also says: [¶27, abridged] "The divine teaching of the Church brings the sure guidance of shining light. Therefore, there is no reason why true science should feel aggrieved at having to bear the restraint of laws by which, in the judgment of the Church, human teaching has to be controlled."</ref> Those principles and Tyndall's principles were profound enemies. Luckily for Tyndall he didn't need to get into a contest with them in Britain. Even in Italy, Huxley and Darwin were awarded honorary medals and most of the Italian governing class was hostile to the papacy.<ref>For Italy see [[Prisoner in the Vatican]]. Also see {{cite book |author=Don O'Leary |url=https://archive.org/details/romancatholicism00olea |title=Roman Catholicism and Modern Science: A History |publisher=Continuum International Publishing Group |year=2006 |isbn=978-0-8264-1868-5 |pages=[https://archive.org/details/romancatholicism00olea/page/57 57] |url-access=registration}}</ref> But in Ireland during Tyndall's lifetime the majority of the population grew increasingly doctrinaire and vigorous in its Roman Catholicism and also grew stronger politically. Between 1886 and 1893, Tyndall was active in the debate in England about whether to give the Catholics of Ireland more freedom to go their own way. Like the great majority of Irish-born scientists of the 19th century he opposed the [[Irish Home Rule Movement]]. He had ardent views about it, which were published in newspapers and pamphlets.<ref>For a list of Tyndall's pamphlets against Irish Home Rule search both [https://www.amazon.co.uk/s?search-alias=stripbooks&field-author=tyndall&field-title=gladstone Amazon] and [http://catalogue.nla.gov.au/Search/Home?lookfor=%28author%3AJohn+AND+author%3ATyndall%29+AND+%28subject%3A%22Ireland+-+Politics+and+government+-+1837-1901.%22+OR+subject%3A%22Great+Britain+-+Politics+and+government+-+1837-1901.%22%29&type=all&limits=format%3ABook&submit=Find National Library of Australia]. One of the pamphlets, ''Mr. Gladstone's Sudden Reversal of Polarity'', documented how British Prime Minister [[William Ewart Gladstone|Gladstone]] did a [[Flip-flop (politics)|flip-flop]] on the Home Rule question. The intent was to undermine Gladstone's intellectual credibility on the question. Gladstone publicly defended himself against the attack. The debate between them got a lot of attention in the newspapers. Tyndall was a conspicuous participant in the Irish Home Rule debate in the London newspapers between 1886 and 1893. When he died in 1893, ''The Times'' newspaper [https://archive.org/stream/eminentpersonsbi06timeiala#page/84/mode/2up obituary] noted that "our readers will remember many eloquent letters written by him of late years, full of unsparing condemnation of Mr. Gladstone's recent [Ireland] policy."</ref> For example, in an opinion piece in ''[[The Times]]'' on 27 December 1890 he saw priests and Catholicism as "the heart and soul of this movement" and wrote that placing the non-Catholic minority under the dominion of "the priestly horde" would be "an unspeakable crime".<ref>More from Tyndall's letter is in the year 1891 compilation [https://archive.org/details/gladstoneireland00londiala/ ''Gladstone, Ireland, Rome: A word of warning to electors''] (publisher: Fowler Brothers), page 119.</ref> He tried unsuccessfully to get the UK's premier scientific society to denounce the Irish Home Rule proposal as contrary to the interests of science.<ref>The scientists of the British Isles were nearly unanimous in opposing Irish Home Rule, but, to Tyndall's disappointment, a majority of them also thought that the matter didn't have enough direct bearing on the vital interests of science to warrant an organized formal denunciation by them. See: {{Cite book |last=Jones |first=Greta |title=Defenders of the Union: A Survey of British and Irish Unionism Since 1801 |publisher=Routledge |year=2001 |editor1-last=Boyce |editor1-first=D. George |place=London |pages=188–208 |contribution=Scientists against Home Rule |editor2-last=O'Day |editor2-first=Alan |contribution-url=https://books.google.com/books?id=LO-KXwPEDYIC&pg=PA188}}</ref>
-In several essays included in his book ''Fragments of Science for Unscientific People'', Tyndall attempted to dissuade people from believing in the potential effectiveness of prayers. At the same time, though, he was not broadly anti-religious.<ref name=TyndallOnReligion>The collection of Tyndall's essays where his views on religion are most clearly stated is ''Fragments of Science, Volume Two'' (also published under the title ''Fragments of Science for Unscientific People''). It is online in HTML text format at [http://www.gutenberg.org/cache/epub/24527/pg24527.txt Gutenberg.org] and in other text formats at [https://archive.org/details/fragmscience02tyndrich Archive.org].</ref><ref name=DeYoung>{{cite book | title=A Vision of Modern Science: John Tyndall and the Role of the Scientist in Victorian Culture | url=https://archive.org/details/visionmodernscie00deyo_431 | url-access=limited | author=DeYoung, Ursula | year=2011 | pages=[https://archive.org/details/visionmodernscie00deyo_431/page/n280 280] | isbn=978-0-230-11053-3}} Reports that Tyndall's religious beliefs were "half-agnostic, half-deistic" (page 2) and "Tyndall viewed religion itself as both inescapable and emotionally necessary for humanity, though his conviction of religion's importance was often lost on his critics" (page 5).</ref>
+In several essays included in his book ''Fragments of Science for Unscientific People'', Tyndall attempted to dissuade people from believing in the potential effectiveness of prayers. At the same time, though, he was not broadly anti-religious.<ref name=TyndallOnReligion>The collection of Tyndall's essays where his views on religion are most clearly stated is ''Fragments of Science, Volume Two'' (also published under the title ''Fragments of Science for Unscientific People''). It is online in HTML text format at [http://www.gutenberg.org/cache/epub/24527/pg24527.txt Gutenberg.org] and in other text formats at [https://archive.org/details/fragmscience02tyndrich Archive.org].</ref><ref name=DeYoung>{{cite book | title=A Vision of Modern Science: John Tyndall and the Role of the Scientist in Victorian Culture | url=https://archive.org/details/visionmodernscie00deyo_431 | url-access=limited | author=DeYoung, Ursula | year=2011 | pages=[https://archive.org/details/visionmodernscie00deyo_431/page/n280 280] | publisher=Palgrave Macmillan US | isbn=978-0-230-11053-3}} Reports that Tyndall's religious beliefs were "half-agnostic, half-deistic" (page 2) and "Tyndall viewed religion itself as both inescapable and emotionally necessary for humanity, though his conviction of religion's importance was often lost on his critics" (page 5).</ref>
 Many of his readers interpret Tyndall to be a confirmed agnostic,<ref>{{cite book|title=John Tyndall, essays on a natural philosopher|year=1981|publisher=Royal Dublin Society|author1=William Hodson Brock |author2=Norman D. McMillan |author3=R. Charles Mollan |author4=Royal Dublin Society |editor=William Hodson Brock|page=67|quote=He did not give an answer – but he remained a confirmed agnostic.}}</ref><ref>{{cite book|title=John Tyndall (1820–1893)|year=1920|publisher=The Science Press|author=Arthur Whitmore Smith|page=338|quote=Tyndall, like most of his friends, was a reverent agnostic. He did not believe that the ultimate truths of the universe could be expressed in words, or that our limited and finite intelligence could as yet comprehend them. His writings, however, contain many phrases which show that he was familiar with the books of Holy Scripture. And often, after a Sunday evening tea, he would join his friends in the singing of psalm tunes.}}</ref><ref>{{cite book|title=Reconstructing Nature: The Engagement Of Science And Religion|year=2000|publisher=Continuum International Publishing Group|isbn=9780567087256|author1=John Brooke |author2=Geoffrey Cantor |pages=250 + 254|quote=Tyndall's biographers rightly insist that he was not an atheist and instead suggest that he should be labelled an agnostic since he rejected the claims of both scientists and theologians who allowed science to be debased by ungrounded speculations.}}</ref><ref>{{cite book |author=John H. Lienhard |url=https://archive.org/details/howinventionbegi00lien/page/204 |title=How Invention Begins: Echoes of Old Voices in the Rise of New Machines |publisher=Oxford University Press |year=2006 |isbn=9780195305999 |page=[https://archive.org/details/howinventionbegi00lien/page/204 204] |quote=The agnostic physicist John Tyndall once remarked that Faraday drank from a fount on Sunday that refreshed his soul for a week. |url-access=registration}}</ref><ref>{{cite book|title=Unjustifiable Risk?: The Story of British Climbing|year=2011|publisher=Cicerone Press Limited|isbn=9781849653787|author=Simon Thompson|page=38|quote=Tyndall was a committed agnostic who argued fiercely and frequently and once offered to fight a man who disagreed with his high opinion of Thomas Carlyle.}}</ref><ref>{{cite book|title=Disseminating Darwinism: The Role of Place, Race, Religion, and Gender|year=2001|publisher=Cambridge University Press|isbn=9780521011051|editor1=Ronald L. Numbers |editor2=John Stenhouse |page=77|quote=Free thinkers and agnostics indeed occupied chairs at Canterbury College and the University of Otago. A. W. Bickerton, professor of chemistry at Canterbury, had trained in London under militant agnostics T. H. Huxley and John Tyndall, and tirelessly popularized scientific materialism in Christchurch, to the annoyance of local Christians besides Maskell.}}</ref><ref>{{cite book |author=Anthony Kenny |title=The Unknown God: Agnostic Essays |publisher=Continuum International Publishing Group |year=2005 |isbn=9780826476340 |page=161 |quote=John Tyndall, the agnostic President of the Royal Society, thus describes the view from the summit of the Weisshorn: 'An influence seemed to proceed from it direct to the soul; the delight and exultation experienced were not those of Reason or Knowledge, but of Being...'}}</ref> though he never explicitly declared himself to be so.<ref name=TyndallOnReligion /><ref name=DeYoung /> The following statement from Tyndall is an example of Tyndall's agnostic mindset, made in 1867, and reiterated in 1878: "The phenomena of matter and force come within our intellectual range... but behind, and above, and around us the real mystery of the universe lies unsolved, and, as far as we are concerned, is incapable of solution.... Let us lower our heads, and acknowledge our ignorance, priest and philosopher, one and all."<ref name=TyndallOnReligion />
 ==Private life==
-Tyndall did not marry until age 55. His bride, [[Louisa Charlotte Tyndall|Louisa Hamilton]], was the 30-year-old daughter of a member of parliament ([[Lord Claud Hamilton (1813–1884)|Lord Claud Hamilton, M.P.]]). The following year, 1877, they built a summer [[chalet]] at [[Belalp]] in the [[Swiss Alps]]. Before getting married Tyndall had been living for many years in an upstairs apartment at the Royal Institution and continued living there after marriage until 1885 when a move was made to a house near [[Haslemere]] 45 miles southwest of London. The marriage was a happy one and without children. He retired from the Royal Institution at age 66 having complaints of ill health.{{citation needed|date=May 2022}}
+Tyndall did not marry until age 55. His bride, [[Louisa Charlotte Tyndall|Louisa Hamilton]], was the 30-year-old daughter of a member of parliament ([[Lord Claud Hamilton (1813–1884)|Lord Claud Hamilton, M.P.]]). The following year, 1877, they built a summer [[chalet]] at [[Belalp]] in the [[Swiss Alps]]. Before getting married Tyndall had been living for many years in an upstairs apartment at the Royal Institution and continued living there after marriage until 1885 when he and Louisa moved to a house near [[Haslemere]] 45 miles southwest of London. The marriage was a happy one and without children. He retired from the Royal Institution at age 66 having complaints of ill health.{{citation needed|date=May 2022}}
 Tyndall became financially well-off from sales of his popular books and fees from his lectures (but there is no evidence that he owned commercial patents). For many years he got non-trivial payments for being a part-time scientific advisor to a couple of quasi-governmental agencies and partly donated the payments to charity. His successful lecture tour of the United States in 1872 netted him a substantial amount of dollars, all of which he promptly donated to a trustee for fostering science in America.<ref>[[s:Popular Science Monthly/Volume 3/May 1873/Professor Tyndall's Deed of Trust|Professor Tyndall's Deed of Trust]] in ''Popular Science Monthly'', May 1873. See also [https://timesmachine.nytimes.com/timesmachine/1885/07/08/109310694.pdf Prof. Tyndall's Trust] in ''The New York Times'', 8 July 1885.</ref> Late in life his money donations went most visibly to the [[Irish Unionist]] political cause.<ref>[https://timesmachine.nytimes.com/timesmachine/1892/06/25/104137128.pdf Gladstone's Home Rule]. ''The New York Times'', 25 June 1892.</ref> When he died, his wealth was £22,122.<ref>The value of Tyndall's estate at [[probate]] was £22,122: biography of John Tyndall by W. M. Brock in ''Oxford Dictionary of National Biography'' (2004). Some ways to assess today the magnitude of £22,122 wealth in 1893 are at [http://www.measuringworth.com/ukcompare/relativevalue.php?use%5B%5D=CPI&use%5B%5D=NOMINALEARN&year_early=1893&pound71=22122&shilling71=&pence71=&amount=22122&year_source=1893&year_result=2013 MeasuringWorth.com].</ref> For comparison's sake, the income of a police constable in London was about £80 per year at the time.<ref>{{cite web|page =10|url=http://www.clarku.edu/faculty/jbrown/papers/shpayer.pdf|title=A Work-Life History of Policemen in Victorian and Edwardian England|author=Haia Shpayer-Makov|publisher=University of Haifa, Israel}}</ref>
@@ Line 109: / Line 111: @@
 [[File:Tyndall-Denkmal.jpg|thumb|upright|The Swiss memorial to John Tyndall, with the [[Aletsch Glacier]] in the background]]
 [[File:Tyndall's grave.jpg|thumb|right|Tyndall's grave in St Bartholomew's churchyard, [[Haslemere]], Surrey U.K.]]
+[[File:John and Louisa Tyndall grave (2024).jpg|thumb|The gravestone of John and Louisa Tyndall (2024)]]
 [[File:Plaques_to_Tyndall_and_Vigors,_Leighlinbridge.jpg|thumb|Plaques to Tyndall in Leighlinbridge]]
-In his last years Tyndall often took [[chloral hydrate]] to treat his [[insomnia]]. When bedridden and ailing, he died from an accidental overdose<ref>In late years he was taking magnesia for dyspepsia and chloral hydrate for insomnia. His wife, who administered the drugs, accidentally gave him none of the former and a lethal overdose of the latter. A newspaper report of Mrs. Tyndall's testimony at the coroner's inquest: {{cite news | date = 25 December 1893 | title = Mrs. Tyndall's Fatal Error | publisher = The New York Times (1893) | url = https://query.nytimes.com/gst/abstract.html?res=9F00E4D9173EEF33A25756C2A9649D94629ED7CF}}</ref>  of this drug in 1893 at the age of 73, and was buried at [[Haslemere]].<ref>{{cite journal | title = Obituary Notice of John Tyndall | author = Edward Frankland | journal = Proceedings of the Royal Society of London | year = 1894 | volume = 55 | pages = xviii – xxxiv| url = https://archive.org/details/proceedingsroya27britgoog }}</ref> The overdose was administered by his wife Louisa. “My darling,” said Tyndall when he realized what had happened, “you have killed your John.” <ref>{{cite journal | author = Dry, Sandra | title = A long-awaited biography does justice to John Tyndall, a pioneering climate researcher and science advocate | journal = Science | year = 2018 | volume = 360 | pages = 1307 | url = http://blogs.sciencemag.org/books/2018/06/19/the-ascent-of-john-tyndall/ | doi = 10.1126/science.aat6293| s2cid = 49357758 }}</ref>
+In his last years Tyndall often took [[chloral hydrate]] to treat his [[insomnia]]. When bedridden and ailing, he died from an accidental overdose<ref>In late years he was taking magnesia for dyspepsia and chloral hydrate for insomnia. His wife, who administered the drugs, accidentally gave him none of the former and a lethal overdose of the latter. A newspaper report of Mrs. Tyndall's testimony at the coroner's inquest: {{cite news |date=25 December 1893 |title=Mrs. Tyndall's Fatal Error |work=The New York Times |url=https://query.nytimes.com/gst/abstract.html?res=9F00E4D9173EEF33A25756C2A9649D94629ED7CF}}</ref> of this drug in 1893 at the age of 73, and was buried at [[Haslemere]].<ref>{{cite journal |title=Obituary Notice of John Tyndall |author=Edward Frankland |journal=Proceedings of the Royal Society of London |year=1894 |volume=55 |pages=xviii–xxxiv |url=https://archive.org/details/proceedingsroya27britgoog}}</ref> The overdose was administered by his wife Louisa. "My darling," said Tyndall when he realized what had happened, "you have killed your John."<ref>{{cite journal |author=Dry, Sandra |title=A long-awaited biography does justice to John Tyndall, a pioneering climate researcher and science advocate |journal=Science |year=2018 |volume=360 |pages=1307 |url=http://blogs.sciencemag.org/books/2018/06/19/the-ascent-of-john-tyndall/ |doi=10.1126/science.aat6293 |s2cid=49357758}}</ref>
-Afterwards, Tyndall's wife took possession of his papers and assigned herself supervisor of an official biography of him. She procrastinated on the project, however, and it was still unfinished when she died in 1940 aged 95.<ref>Louisa Tyndall wanted a collaborator, but was unsatisfied with all candidates. Later, according to Crowther, she would only accept one who would live in her own house, and none such was found. {{cite book | author = Crowther, J. G. | title = Scientific Types | url = https://archive.org/details/scientifictypes00crow | url-access = registration | year = 1968 | publisher = Barrie & Rockliff, The Crescent Press Ltd. | location = London | pages = [https://archive.org/details/scientifictypes00crow/page/187 187–188]| isbn = 9780248997294 }}</ref> The book eventually appeared in 1945, written by A. S. Eve and C. H. Creasey, whom Louisa Tyndall had authorised shortly before her death.
+Afterwards, Tyndall's wife took possession of his papers and assigned herself supervisor of an official biography of him. She procrastinated on the project, however, and it was still unfinished when she died in 1940 aged 95.<ref>Louisa Tyndall wanted a collaborator, but was unsatisfied with all candidates. Later, according to Crowther, she would only accept one who would live in her own house, and none such was found. {{cite book |author=Crowther, J. G. |title=Scientific Types |url=https://archive.org/details/scientifictypes00crow |url-access=registration |year=1968 |publisher=Barrie & Rockliff, The Crescent Press Ltd. |location=London |pages=[https://archive.org/details/scientifictypes00crow/page/187 187–188]|isbn=9780248997294}}</ref> The book eventually appeared in 1945, written by A. S. Eve and C. H. Creasey, whom Louisa Tyndall had authorised shortly before her death.
 John Tyndall is commemorated by a memorial (the ''Tyndalldenkmal'') erected at an elevation of {{convert|2340|m}} on the mountain slopes above the village of [[Belalp]], where he had his holiday home, and in sight of the [[Aletsch Glacier]], which he had studied.<ref>{{cite web |url=https://s.geo.admin.ch/81328e6318 |title=Tyndalldenkmal |work=map.geo.admin.ch |publisher=Swiss Confederation |access-date=10 April 2019}}</ref>
-==John Tyndall's books==
+== John Tyndall's books ==
 * Tyndall, J. (1860), [https://archive.org/details/glaciersofalpsbe00tyndrich The glaciers of the Alps, Being a narrative of excursions and ascents, an account of the origin and phenomena of glaciers and an exposition of the physical principles to which they are related], (1861 edition) Ticknor and Fields, Boston
 * Tyndall, J. (1862), [https://archive.org/details/mountaineeringi00tyndgoog Mountaineering in 1861. A vacation tour], Longman, Green, Longman, and Roberts, London
@@ Line 135: / Line 139: @@
 * Tyndall, J. (1878), [https://archive.org/details/soundacourseeig01tyndgoog Sound; delivered in eight lectures], (1969 edition), Greenwood Press, New York
 * Tyndall, J. (1882), [https://archive.org/details/essaysonfloatin02tyndgoog Essays on the floating matter of the air, in relation to putrefaction and infection], D. Appleton, New York
-* Tyndall, J. (1887), [https://archive.org/details/lightelectricity00tyndiala Light and electricity: notes of two courses of lectures before the Royal institution of Great Britain], D. Appleton and Company, New York
+* Tyndall, J. (1887), [https://archive.org/details/lightelectricity00tyndiala Light and electricity: notes of two courses of lectures before the Royal Institution of Great Britain], D. Appleton and Company, New York
 * Tyndall, J. (1892), [https://archive.org/details/newfragments00tynduoft ''New Fragments''] (miscellaneous essays for a broad audience), D. Appleton, New York
 ==See also==
 * [[Ice sheet dynamics]]
-* [[Spontaneous generation]]
 * [[Greenhouse gas]]
 * [[:File:Tyndalls setup for measuring radiant heat absorption by gases annotated.jpg|John Tyndall's system for measuring radiant heat absorption in gases]]
-* [[Tyndall's bar breaker]]
 ==Notes==
@@ Line 152: / Line 154: @@
 ===Biographies of John Tyndall===
 * {{cite book |author1=Eve, A.S.  |author2=Creasey, C.H. | title=Life and Work of John Tyndall | year=1945 | publisher=Macmillan | location=London }} 430 pages. This is the "official" biography.
-* [[William Tulloch Jeans]] wrote a 100-page biography of Professor Tyndall in 1887 (the year Tyndall retired from the Royal Institution). [https://archive.org/details/livesofelectrici00jean Downloadable].
+* [[William Tulloch Jeans]] wrote a 100-page biography of Professor Tyndall in 1887 (the year Tyndall retired from the Royal Institution). [https://archive.org/details/livesofelectrici00jean Downloadable]. See also ''[https://www.gutenberg.org/ebooks/73641 The Lives of Electricians]'': Professors Tyndall, Wheatstone, and Morse. (1887, Whittaker & Co.)
 * Louisa Charlotte Tyndall, his wife, wrote an 8-page biography of John Tyndall that was published in 1899 in ''Dictionary of National Biography'' (volume 57). It is [[s:Tyndall, John (DNB00)|readable online]] (and a 1903 republication of the same biography is also [https://archive.org/stream/lecturesessays00tyndiala#page/n10/mode/1up readable online]).
 * [[Edward Frankland]], a longtime friend, wrote a 16-page biography of John Tyndall as an obituary in 1894 in a scientific journal. It is [https://archive.org/stream/proceedingsroya27britgoog/#page/n520/mode/1up readable online].
@@ Line 165: / Line 167: @@
 *{{cite book | title=A Vision of Modern Science: John Tyndall and the Role of the Scientist in Victorian Culture | url=https://archive.org/details/visionmodernscie00deyo_431 | url-access=limited | publisher=[[Palgrave Macmillan]] | author=DeYoung, Ursula | year=2011 | pages=[https://archive.org/details/visionmodernscie00deyo_431/page/n280 280] | isbn=978-0-230-11053-3}}.
 *{{cite book | title=The Ascent of John Tyndall | publisher=[[Oxford University Press]] | author=Jackson, Roland | year=2018 | pages=556 | isbn=9780198788959}} The first major biography of Tyndall since 1945.
+* {{Cite EB1911|wstitle=Tyndall, John|volume=27|pages=499–500}}
 == Further reading ==
@@ Line 189: / Line 192: @@
 [[Category:Experimental physicists]]
 [[Category:University of Marburg alumni]]
-[[Category:Irish physicists]]
+[[Category:19th-century Irish physicists]]
 [[Category:Optical physicists]]
 [[Category:Glaciologists]]

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