Machinists' and draftsmen's handbook, containing tables, rules and formulas, with numerous examples explaining the principles of mathematics and mechanics as applied to the mechanical trades; intended as a reference book for all interested in mechanical work (1910)
Lobben, Peder, 1858- · New York, D. Van Nostrand company · leaf 344
diame-ter, 24 inches long. Drum-shaft, 2X inches in di-ameter. The drum andlarge gear are fitted andkeyed to the drum shaftand also bolted together,thereby relieving this shaftfrom twisting stress. The radius of thedrum added to the radiusof the rope makes fourinches, and the force ismultiplied… … 18 X 72 X 5 = 33 pounds, very nearly. Thus, when two men are working the derrick (one at eachcrank), each man has to exert a force of 16>^ pounds,but, including friction, each man probably exerts a force of 20to 25 pounds, when the derrick is loaded to its full capacity. For very rapid work it…
Mechanical engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
