The Ellipsograph, a Mechanism for Constructing an Ellipse

This Demonstration shows a top view of an ellipsograph, a mechanism for constructing the ellipse . The points and slide along the and axes. The distance between them is and the distance between and is .

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DETAILS

Reference
[1] D. Wells, The Penguin Dictionary of Curious and Interesting Geometry, New York: Penguin Books, 1991 p. 66.
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