Haswell, Charles Haynes, 1809- [from old catalog] · New York, Harper & brothers · leaf 339
W ^z=P; 2«XP = W; WP : : 2n, n representing the numbei of distinct cords.Example.—What weight will a power of 1lb. sustain in a system of four movable pul-leys and four cords ? 1X2X2X2X2 = 16/6S. When fixed Pidleys, e e, are used in theplace of Hooks, to Attach the Ends ofthe Rope to the… … CRANES, 335 When the Ends of the Cord or the fixed Pulleys are fastened to the Weight,as by an Inversion of the last Figures, putting the Supports for theWeights, and contrariwise—Figs. 3 and 4. w w FiS-3- -7r^-r, = J1i <2»-l)XP = W; - = (2»-l).Fig. 4. _^_- = P; (3»-l)xP = W; ^ = (2*-l).…
Engineering · Mechanical engineering
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