Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 267
Fig. 501. proportions and the forms of thread, but without producing complete uni-formity in the practice of different countries and makers. The old form ofthread was the triangular pitch (Fig. 502), still used by some, especially whenthe threads are cut in a lathe. In this country the standard U.… … Fig. 502, that recommended by the Franklin Institute in 1864 (Fig. 503). The angle is60°, with straight sides and fiat surface at top and bottom, equal to one eighththe pitchy or distance from centre to centre of threads. In England, the standard thread for bolts and nuts is the Whitworth (Fig.504)…
Mechanical drawing
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