The naval architect's and shipbuilder's pocket-book of formulae, rules, and tables and marine engineer's and surveyor's handy book of reference (1884)
Mackrow, Clement · London, C. Lockwood and co. · leaf 459
es. ^^^* ^2 . In fig. 172 let ABC be a crane, AC the tie rod, bc thejib, and ab the crane post.w = weight suspended fromcrane—say, 6 tons. Alongthe vertical line cw parallelto ab draw to any con-venient scale ab = ^ tons =W. From h draw Ic parallelto BC, and from a draw acparallel to AC, cutting he… … CRANES, PULLEYS, ETC. 451 Hand Cranes. p = povv-er applied to handle in lbs. D = diameter of circle described by handle in inches. W = weight to be lifted in lbs. N = number of revolutions of handle. n = number of revolutions of barrel. d = diameter of barrel in inches. I = length of handle in…
