Build a Swinging Art Table for Uniquely Hypnotic Drawings | Make:

Harmonographs are mechanical devices that draw pictures by swinging pendulums, believed to be invented in 1844 by Scottish mathematician Hugh Blackburn. In my 3-pendulum rotary harmonograph, two lateral pendulums swing back and forth at right angles to each other (one side to side, another front to back) with arms connecting to a pen. A third “rotary” pendulum moves the paper by swinging on any axis or in circular motions.

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