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 42
plane. All lines be- Object- Picfure Plane -] Project. Projecting LinesPoint of Sight -^y Object--Picture Plane-sS / 1 Projecting Lines\\ ^ - 4r * -\ // >~ Projection (a) (b) Fig. 51.—Perspective projection (a) and orthographic projection (b) compared. hind the picture plane will be projected… … Projecting!lines-^ 1 1 1 . / , 1 , / 1 1 1 1 / 1 1 1 , 1 i 1 1 1 1 1 1 1 r i 1 1 1 1 1 1 1 / / 1 1 1 1 1 1 i h s-Projected Outline --Picture Plane Fig. 52.—Dissimilar objects giving identical projections. Orthographic Projection.—If the observer is considered as havingmoved an infinite distance…
Mechanical drawing
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