Harmonograph: Difference between revisions

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http://www.wikipedia.org/wiki/Frumpysnarf

A mechanical device that employs pendulums to create a picture. The drawings created by the machines can be Lissajous figures or even more complex. The devices appeared in the 19th Century in attributed to Jules Antoine Lissajous.

A simple harmonograph uses two pendulums to control the movement of a pen relative to a drawing surface. One pen moves the pen back and forth along one axis and the other pendulum moves the drawing surface back and forth along a perpendicular axis. By varying the frequency of the pendulums relative to one another (and phase) different patterns are created, Even a simple harmonograph as described can create elipses, spirals, figure eights and other Lissajous figures.

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 http://www.wikipedia.org/wiki/Frumpysnarf
+A mechanical device that employs pendulums to create a picture.  The drawings created by the machines can be [[Lissajous figures]] or even more complex. The devices appeared in the 19th Century in attributed to [[Jules Antoine Lissajous]].
+A simple harmonograph uses two pendulums to control the movement of a pen relative to a drawing surface.  One pen moves the pen back and forth along one axis and the other pendulum moves the drawing surface back and forth along a perpendicular axis. By varying the frequency of the pendulums relative to one another (and phase) different patterns are created,  Even a simple harmonograph as described can create elipses, spirals, figure eights and other [[Lissajous figures]].