A model of the famous toy known as a spirograph. A circle of radius r (see blue circle below) is allowed to roll around the inside of a circle of radius R (see black circle below). We assume that the ...
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After Nearly 60 Years, Spirograph Keeps Rolling Along“Spirograph products can be found online and in retailers all across the country and internationally, from big mass market chains to independent toys stores, museum gift shops, drug ...
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