A text book of elementary mechanics, for the use of colleges and schools (1894)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley and sons · leaf 251
Fig. 167. 225. The Pulley on the Principle of Work. 1. SingleFixed Pulley, Here (Fig. 168) the power and weightact through equal distances; that is, s = h, and there-fore W = P, 2, Single Movable Pulley with Parallel Strings. In 232 STATICS. [175. this case (Figs. 169, 170) the distance through… … Fio. 169. Fio. 170. 3. Single Movalle Pulley with Strings not Parallel.The effective component of the power is P cos a (Fig.171), and since s = 2h, as above, W=2P cos a, 4. First System of Pulleys. Suppose that the weight(Fig. 172) is raised through aheight h, the wheel D is evidentlyraised 2h; the…
Mechanics -- 1801-1900
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