Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 33
25. THE SCREW. All measures in equalunits or inches. W = PX (2 X ?X 3.T416)Pitch of screw p = W X pitch of screw2 X r X 3.1416 h- hk>- 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 rX 6.28 X… … 27. CHINESE WHEEL, or differen-tial axle, with crank or pulley. a = radius large drum.d = radius small drum. W — P X r X 2 a — d p = W X (^ — d)rX 2 THE MECHANICAL POWERS, 23 TACKLE BLOCKS. w
Mechanical movements
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