Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 130
Fig. 132. Lines Drawn Parallel or Perpendicular to Any Given Line Lines perpendicular to the given line may be drawn alongthe edge of triangle B which is at 90° to the given line. The direction in which lines should be drawn along thetriangles is shown in Figs. 129 and 130. The forearm shouldalways…
Mechanical drawing
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