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 9
-Fixed Triangieor Straight Edge --Fixed Triangleor Straight Edge 1 - Fixed Triangle or Straight Edge (a) (b) (c) Fig. 7.—Drawing parallel and perpendicular lines with the triangles. … Fig. 8.—Some special triangles the other triangle or any straight-edge against either remaining edgeof the first triangle (Fig. 7a). The second triangle is held fixed forthe first to slide along to the desired position. The correct method ofdrawing a line perpendicular to any given line consists in…
Mechanical drawing
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