Henry Eugene Vandervell ends The Figure Skate with a challenge: to skate a hypocycloid. The hypocycloid is the most difficult of three curves he describes: the epicycloid, the cycloid, and the hypocycloid. All three are the designs made by a point on the edge of a circle being rolled along a line. For the epicycloid,… Continue reading H. E. Vandervell’s hypocycloid challenge