Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 215
remedied by employing arcs, of which the radius isone and a half or twice the pitch. In practice, the ordinary mode inwhich epicycloidal teeth are set out is by the mechanical method of form-ing the pattern teeth by temjplets (figs. 272, 273, 274, 275). Having determined the pitch of the teeth and… … Fig. 272. of the wheel to the points of the teeth. The slips are then cut to the cir-cumferences of the circular arcs described upon them. These two piecesso prepared are fastened together by screws, as in the ^g. 272 ; the piece
