DescriptionLeiden - Kamerlingh Onnes Building - Commemorative plaque.jpg
English: Commemorative plaque in Kamerlingh Onnes Building, Steenschuur, Leiden (The Netherlands). Text: the liquefaction of helium took place here on 10 July 1908 by dr Heike Kamerlingh Onnes. This plaque was offered to him by the staff of his laboratory on the occasion of the 40th anniversary of his professorship, 11 November 1922
Nederlands: Gedenksteen aan het Kamerlingh Onnesgebouw, Steenschuur, Leiden met de tekst in hoogreliëf: "Op deze plaats werd den 10 juli 1908/door/Dr. Heike Kamerlingh Onnes/voor de eerste maal helium vloeibaar gemaakt/Het gezamenlijke laboratoriumpersoneel heeft hem bij zijn/veertigjarige hoogleraarschap dezen gedenksteen aangeboden/11 november 1922".
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