Wallis, Rolland S. [from old catalog], Iowa state college of agriculture and mechanic arts, Ames. Dept. of engineering extension. [from old catalog] · Ames, Iowa, Engineering extension department, Iowa state college · leaf 25
ooden straight edges (Fig. 30a)usually have hardwood or celluloid edges, while those of steel (Fig. (a) (b) Fig. 30.—Straight edges. 30b) usually have one edge beveled for convenience in penciling. Thestraight edge is used for drawing long lines, and as a support for tri-angles and protractors.… … Fig. 31.—Proportional dividers. ment consists essentially of two equal legs pointed at both ends andopening on an adjustable pivot, the position of which determines theratio of the end openings between points. Distances are taken off witlione pair of points and the other pair used to give the…
Mechanical drawing
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