Peter Nunn wrote:

Cannot remember the exact details but I remeber that the rotor (choroid ?)
is made by revolving a circle whose circumference is 1/3 of a second circle
around the inside of the larger circle, while the housing (epichoroid ?) is
drawn by rotating the smaller circle around the outside of the larger
circle.  Obviously the shapes are the track taken by one point on the
smaller circle.

 
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