Patent 3,324,566

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Pendulum Toy; G. Everett, 1967

From all appearances, this looks more like a tool than a mere toy.  A very stable and sturdy design, which is an important consideration if you wish to produce nice quality harmonograms.  It combines the motion of two pendulums that rotate in a single plane (a Lissajous Figure Drawing Machine).  The two pendulums intersect at a bit less than the optimum 90 degree angle.

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