NPPF: CANTO ONE: Lemniscate

[David Morris]

Nice web site, which even has an image called "Lemniscate linkage 2" which
looks like a bicycle:

http://xahlee.org/SpecialPlaneCurves_dir/LemniscateOfBernoulli_dir/lemniscateOfBernoulli.html

Lemniscate of Bernoulli is the intersection of a plane tangent to the inner
ring of a torus whose inner radius equals to its radius of generating circle. 


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