Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 268
Fig. 507. Fig. 508. Fig. 509. Figs. 511 and 512 are circular nuts, in one of which holes are drilled toinsert a rod for turning, and in the other grooves for a spanner. Loch-nuts (Fig. 513) are intended to prevent the gradual unscrewing of
Mechanical drawing
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