Swinging Double Slider-Crank


	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

Ellipse (Wolfram MathWorld)

"Swinging Double Slider-Crank" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/SwingingDoubleSliderCrank/

Contributed by: Ed Pegg Jr

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