Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 210
elations to the forces. Represent these forces by weights (Fig. 381). Let P and P be the extreme forcesacting over the pulleys M and N, and tending to draw the rope straight, which theweight P prevents. Lay offthe weight of P (90 pounds) Ci along A B, and the weight ofP (60 pounds) along A C.Draw B… … Y\a. 888.
Mechanical drawing
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