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Spirograph 64/96T Ring And 36T Wheel
A module 1.5 spirograph drawing set. The 145 mm ring has 64 internal teeth (96 mm pitch circle) for hypotrochoids and 96 external teeth for epitrochoids, plus three 2 mm push-pin holes so you can pin it to paper. The matching 36-tooth, 54 mm wheel has twelve 2.4 mm pen holes in a spiral that take a ballpoint or gel-pen tip. Inside the ring it draws a 16-lobe rosette, and every pen hole gives a different curve.
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