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 31
35. One fixed pulley block, three fixed rope ends. 8 … 36. Multiple sheave blocks, all single. P = W W = P X 26. uw
Mechanical movements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.