The mechanical engineer's pocket-book. A reference-book of rules, tables, data, and formulæ, for the use of engineers, mechanics, and students (1910)
Kent, William, 1851-1918 · New York, J. Wiley & sons · leaf 562
int P on thepulling rope descends the same amount that the load is lifted, thereforeP = W. In B and C the point P moves twice as far as the load is lifted,therefore W = 2 P. In B and C there is one movable block, and twoplies of the rope engage with it. In D there are three sheaves in themovable… … W — 6 P. In general, the ratio of W to P is equal to the number of pliesof the rope that are shortened, and also is equal to the number of plies thatengage the lower block. If the lower block has 2 sheaves and the upper3, the end of the rope is fastened to a hook in the top of the lower block,and…
Mechanical engineering
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