Procure an empty basting-thread spool and make a hole in its side, at A, just large enough to receive a 1/4-in. steel ball. A piece of celluloid, B, is wrapped around the flanges, as shown, and fastened with small brads. An old negative film, well cleaned, is suitable for the celluloid. Be sure to put the steel ball in before fastening the celluloid in place.

Ill: The Steel Ball is Not So Easily Run Into the Hole as It Appears

The difficulty of the puzzle is to get the ball into the hole. - Contributed by R. C. Knox, Waycross, Ga.