Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 316
80 feet per second, but not bythe increase of tension of rope as shown by sag, which may be taken for a spanof 100 feet at -7 feet, and for other spans directly as their squares—that is, for200 feet it would be 7 X 4 = 2*8 feet. The sag as given is that measured froma horizontal line through the…
Mechanical drawing
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