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 244
advantages which this species of gccring has over wheels working ex-ternally, that the surfaces of contact of the wheel and pinion admit ofbeing more easily increased ; and by making the teeth somewhat longerthan simple necessity demands, the strain may be diftiisod over two ormore teeth at the… … P L ATE X X \ 184
