Watt Parallel Motion
To accompany Folding and Unfolding in Computational Geometry:Part I: Ch.4.1.2: Watt Parallel Motion: Fig.14
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A Watt linkage. Joints x and y are pinned. Joints a and b are free. The locus of point c is the figure 8-curve.

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Applet created by Joseph O'Rourke.