These allow the smaller ones to go into the larger ones.īy placing a ballpoint pen into the gear, the user could spin it around and draw geometric shapes. Some rings have teeth on the outside while the others on the inside. The first Spirographs came with different-sized plastic rings that had gear teeth. He devised the machine to help prevent banknote forgeries. Its inventor’s name was Peter Hubert Desvignes. The original device had the name Speiragraph. More specifically, it’s a device that produces mathematical curves, technically known as hypotrochoids and epitrochoids. Well, you can think of it as advanced math made easy and entertaining to use by anyone of any age. Have you fiddled with an online spirograph pattern generator?
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