Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 129
o Fig. 127. Testing the 45° AngleFig. 128. Testing the 30° and 60° Angles and 60° angles are found to be true, the remaining angle, 30°,will also be true. 124 MECHANICAL DRAWING With the 30°-60° triangle, lines may be drawn at 90° to the … Fig. 129. Lines Drawn WITH THE 30°, 60° Tkiangle Fig. 130. Lines DrawnWITH the 45° Triangle
Mechanical drawing
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