A text book of elementary mechanics, for the use of colleges and schools (1881)
Dana, Edward Salisbury, 1849-1935 · New York, J. Wiley & sons · leaf 248
presentswhat is called the first system ofpulleys ; here W — 2nP. The pul-ley A is supported by two forces^each equal to P; these act on thestring which passes under the pulleyB, so that its tension is 2P. Thepulley B is consequently supportedby two forces, each equal to 2P.Again, the tension of… … Fig. 162. or, in general, W =s 25P,W = 2nP, where n is the number of the pulleys. 230 STATICS. [222. The beam supports at a a tension CiP, also 2P at b,4=P at c, 8P at d, and 16P at e. 222. Second System. W = wP. Fig.163 represents another system of pul-leys. As here but one string is involved,its…
Mechanics
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