Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 33
25. THE SCREW. All measures in equal [^^ Pitch of screw p = W X pitch of screw 2 X r X 3.1416 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 R p = w XpXr ^6.28 X rXR p X 7 — if screw is… … 27. CHINESE WHEEL, or differen-tial axle, with crank or pulley. a = radius large drum.d = radius small drum. W ^ P X 7 X 2 a — d rX 2 THE MECHANICAL POWERS. 23 TACKLE BLOCKS. a % Jj—^ 28. Two single sheaves, a, b, c are of equal/^ii \ strain. ^-|-<^ = W. Sheave A only transfers ^— \r^^ ^ the…
Mechanical movements
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