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 29
25. THE SCREW. All measures in equalunits or inches. W = PX (2 X rX 3.1416)Pitch of screw P = W X pitch of screw2 X rX 3.1416 : h- ii^- 26. WORM GEAR or ENDIvESS SCREW. P = power.r = length of crank.R = radius of pitch line of gear.p = pitch of screw.r = radius of winding drum. W = PXrX6.28XRpXr P… … 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…
Mechanical movements
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