http://demonstrations.wolfram.com/LemniscateLinkage/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
The midpoint of the middle bar of a 3-bar linkage traces out a curve known as a lemniscate. It is interesting to note that a lemniscate is a cross section of a torus.
Contributed by: Ed Pegg Jr
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