An illustration showing how to construct a cycloid. "The circumference C=3.14D. Divide the rolling circle…
"In geometry, a curve generated by the motion of a point on the circumference of a circle which rolls…
"Epicycloidal teeth, teeth for gearing cut in the form of an epicycloid." -Whitney, 1911
"Epicycloidal wheel, a wheel or ring fixed to a framework, toothed on its inner side, and having in…