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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 33

An illustration from 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, leaf 33
.N^- 26. WORM GEAR or ENDLESS SCREW P = power.r = length of crank.R = radius of pitch line of gear.p = pitch of screw.r = radius of winding drum. W=:P X 7X 6.28 X R P = W X /> X r ^6.28 X r X R p xr W . ■—if screw is double-thread.2 … 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.

Mechanical movements

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