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 23
Fig. 26.—The Universal drafting machine. uated head to be moved to any portion of the drawing without rota-tion. The two interchangeable drafting edges (graduated with suit-able scales) always remain at right angles and parallel to their initial … Fig. 27.—Home-made section liner positions. For angular work the two scales may be swung as one andclamped at any angle desired. Thus the use of triangles is not neces-sary, and lines may be drawn along the scale to any desired length inone operation. Variously graduated heads and scales are…
Mechanical drawing
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