Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 109
ight, so that each part of it sustains only one eighthof W. The fixed pulley serves merely to change thedirection of the motion. In this system, therefore, apower of 1 will balance a weight of 8. 227. In general, the advan-tage gained by pulleys is foundby multiplying the number ofmovable pulleys… … THE j:lements of machinery. 105 Thus a -n-eight of 72 pounds may be balanced by four movable pulleys bya T>eight or power of 9 pounds; with two pulleys, by a power of 13 pounds,with one movable pulley, by a power of 36 pounds. These rules apply only to movable pulleys in the same block, when…
Physics · Science · Technology
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