Swinging Double Slider-Crank

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The double slider-crank mechanism was an early method for drawing ellipses. Two prongs of a fixed metal bar slide freely in two perpendicular slots. The bar has an extension that can be locked down. A pen or scriber at the end of the bar follows an elliptical path.

Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA


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