Mechanical movements, powers and devices; a treatise describing mechanical movements and devices used in construcive and operative mechinery and the mechanical arts, being practically a mechanical dictionary (1917)
Hiscox, Gardner Dexter, 1822?-1908 · New York : The Norman W. Henley publishing co. · leaf 30
27. CHINESE WHEEL, or diflferen-tial axle, with crank or pulley. a = radius large drum.d =z radius small drum. W-P XrX 2a — b rX2 THE MECHANICAL POWERS. 23 TACKLE BLOCKS. a £ i|^—^ 28. Two single sheaves, a, b^ c are of equal f^\ strain. «-[- /^ = W. Sheave A only transfers5ri^T^ ^the direction of… … 29. Simple sheave block. P = W. 30. Two single sheave blocks—upper onefixed, lower movable. P= W 2 y^-^-p^-^-^i: 31. Three single sheave blocks—one block fixed, two blocks movable. P r= W —. W = P X 4.4
Mechanical movements
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