Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 135
e needle point. The pen and pencil parts arenow interchangeable without adjusting the needle point. 130 MECHANICAL DRAWING In using the compass proceed in the following manner: 1. Place a 4H lead in the compass and sharpen it to a narrowwedge, in width about one-half the diameter of the lead. 2.… … Fig. 136. Testing the Compass 4. Grasp the compass by the handle between the thumb andfirst finger of the right hand. Care should be taken to place theneedle point exactly at the intersection of the center lines. 5. Adjust the lead to the exact radius and draw the circle,rolling the handle of the…
Mechanical drawing
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