Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 269
Fig. 514. Fig. 519 is a carriage-bolt, from ^ to f diameter, and from 1 to 16 long.Fig. 520 is a plough-bolt, from f to -J- diameter, and from 1 to 4 long. 0 ■r i \ I V^^ /-\^i ill ■ ) t 1.62 * ] Pig. 515. i .
Mechanical drawing
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