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 61
try A knowledge of certain principles of geometry is essential to themechanical draftsman. Purely geometrical constructions are such asmay be made with a pair of compasses and a straight edge, but the drafts-man, with his instruments, has special and less laborious methods of ac-complishing many of… … Sector Fig. 79. Circle.—A circle is a closed curved line every point of which is thesame distance (radius) from a fixed point (center) within. Any twolines radiating from the center cut off a part of a circle (arc) and forman angle (Fig. 79b), each being measured in degrees, 360 of which…
Mechanical drawing
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