Neff, Bill. Bill Neff?s Robot Rapping Hand. Colon: Abbott?s Magic Novelty Co., ca. 1943. A variation of the classic Rapping Hand effect. The carved wooden hand raps out answers to questions on a plexiglass board, tapping its fingers on the boards once for ?yes? and twice for ?no.? Length 9?. A scarce Abbott product. Operates differently than the standard models of the effect which require thread or a special board to move the hand. In presentation, the hand was further isolated from the board ? which could be borrowed ? by a silk handkerchief, and yet rapped out answers to questions all the same.