Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 35
37. Four and three sheave blocks, with end of ropefixed to top block. Four sheave block fixed, threesheave block movable. P = W~6 W = P X 6. … F 38. Roving of a three and two sheave pair ofblocks, with a draw block fixed above. P = W —. W = P X 6.o THE MECHANICAL POWERS. 25
Mechanical movements
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