Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 32
27. CHINESE WHEEL, or differen-tial axle, with crank or pulley. a = radius large drum.b ■=■ radius small drum. W = P X ^ X 2a — I? P = W X {^ — b) r X 2 THE MECHANICAL POWERS. 23 … TACKLE BLOCKS. ^ 28. Two single sheaves, a, b, c are of equal strain. « -f- Z = W. Sheave A only transfersthe direction of P. 29. Simple sheave block. P = W. 30. Two single sheave blocks—upper onefixed, lower movable. P=i_W 2 31. Three single sheave blocks—one block fixed,two blocks movable. P = W…
Mechanical movements
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