Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 351
ves,entirely without woodwork. Most blocks (Figs. 724 and 725) have becketsattached. In the Appendix will be found a table of the strength and weight of hemp,steel-, and iron-wire rope and chain; but as a simple rule of their workingstrength, multiply the square of the girth or circumference of a…
Mechanical drawing
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