Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 262
Fig. 294. Actual Proportions. Fig. 295. Conventional Eepre- Square Head—U. S. Standard sentation. Square Head—TJ. S. Bolts and Nuts Standard Bolts and Nuts (257) 258 MECHANICAL DRAWING Figs. 293 and 295 show the conventional methods of repre-senting hexagonal and square bolt heads and nuts.…
Mechanical drawing
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