A piece of chalk is fastened to the outer circumference of a hoop.. The hoop is rolled across a chalk board. The chalk traces out a cycloid demonstrating zero velocity at the cusps.
References: Halliday and Resnick, Chpt 12,
Fig. 12-1; Hetch, Chpt. 5, Fig. 5-28
This demo can be found in cabinet B on shelf 2 of the UCSD PUL Demo Room
(WLH 2015).