Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 268
Fig. 506. Fig. 510 is a cap-nut, in which the thread does not go through the nut, toprevent leaking along the thread, and a soft copper washer is introduced to pre- vent leakage below the nut.
Mechanical drawing
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