A Harmonograph is a device made up of two pendulums, usually with a pen that is attached to one pendulum tracing a line on paper mounted on the other pendulum. A Harmongram is the resulting drawing. There are many methods of arranging the pendulums, one of which is in the form of a double compound pendulum. In the stereoscopic photograph below, the pen was replaced by a little flashlight and the paper by a stereoscopic camera that captured the light path. To learn more about stereoscopic photography and viewing stereo pictures refer to the section on Stereoscopic Photography.
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