Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 57
PULLEYS. 47 165. A Fixed Pulley, at the top, Fig. 49, is used simplyto chrnge the direction in which a force acts. It enables … the weight to rise with a downward movement ofpower. It is applied for raising weights to a height. 166. The Movable Pulley, middle, Fig. 49, uses two cordsto sustain the weight. By its use, the power then is doubledbut the weight moves only half the distance traversed bythe power. It is* commonly…
Physics
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