Mechanical movements, powers and devices; a treatise describing mechanical movements and devices used in constructive and operative machinery and the mechanical arts, being practically a mechanical dictionary, commencing with a rudimentary description of the early known mechanical powers and detailing the various motions, appliances and inventions used in the mechanical arts to the present time, including a chapter on straight line movements, by Gardner D. Hiscox (1914)
Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 34
27. CHINESE WHEEL, or differen-tial axle, with crank or pullej. a = radius large drum. d = radius small drum. W — P X r X 2 ■p = WX(a — o) THE MECHANICAL POWERS. 23 TACKLE BLOCKS. ^ Jj ^ 28. Two single sheaves, a^ b^ c are of equal d J strain, a ^ b — \V. Sheave A only transfersthe direction of P. … 29. Simple sheave block. P = W. 30. Two single sheave blocks—upper onefixed, lower movable. P=: W 2 .x^^^^^^^^xxx^x.x- 21. Three single sheave blocks—one block fixed, two blocks movable. p = \^^ -—. w = P X 4.4 32. Three smgle sheave blocks, consisting of two fixed
Mechanical movements
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