A harmonograph is a mechanical apparatus that employs pendulums to create a geometric image. The drawings created typically are Lissajous curves, or related drawings of greater complexity. The devices, which began to appear in the mid-19th century and peaked in popularity in the 1890s, cannot be conclusively attributed to a single person, although...
Found on http://en.wikipedia.org/wiki/Harmonograph


instrument drawing curves representing vibrations
Found on http://phrontistery.info/h.html
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