Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 254
N^ ^^ -y /a/f^rji per incft of /en^ffr i … CoTiplete threads-F/at tops —Sharp boffoms BRieOS STANDARD P1P£ Taf?EADS-MODlFlED Fig. 281. Proportion of Common Thread Forms its axis. Fig. 280 shows the construction for the helix. The dis-tance in the direction of the axis traversed by a point in one revo-lution is called the pitch. Pitch in the…
Mechanical drawing
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