Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 270
Fig, 522. Fig. 523. g :|;¥■ Fig. 524. ^ Fig. 525. Fig. 526. MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS. 253 so that they can be screwed into the wood, without any holes being previouslymade. When made of rods, with a square or hexagonal head (Figs. 525 and526) to admit of the use of a wrench, they…
Mechanical drawing
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