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Notes on mechanical drawing (1922)

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

An illustration from Notes on mechanical drawing, 1922, leaf 9
(h) (i) <j> ^^W- Fig 5.—The triangles used separately. Lines parallel to any given line may be drawn conveniently by bring-ing one edge of a triangle to coincide with the line, and then placing … Horizontal- / i \ (h) (I) (J) Fig. 6.—The triangles used in combination Pora/le/ Lines -PerpendicularLine , ,-Perpendicular

Mechanical drawing

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