Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 192
rosshatching lines estimated ? 7. (a) Why are the needle point and the pen and pencilpoints of the compass set at right angles to the plane of thedrawing paper? (b) How is the compass held when drawing acircle? (c) How is it rotated? TRACING AND BLUEPRINTING 187 8. (a) In inking, wliy are the… … Fig. 198. Planing Jig foe Eod Brasses 10. (a) In what order are the object lines inked? (b) Cen-ter lines? (e) Extension and dimension lines? 11. How is ink removed from a drawing ? 12. How is the tracing trimmed to the required size? 13. (a) Upon what geometrical principle does the method…
Mechanical drawing
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