Mechanical drawing. Projection drawing. Isometric and oblique drawing. Working drawings. A condensed text for class room use (1894)
Palmer, Walter Keifer · Columbus, O., C. B. Palmer · leaf 17
meaning of the term projection is essential. 11. From Geometry we have : The projection of apoint upon a straight line is Va^foot of the perpendiculardropped from the point upon the line. Thus: A \ Q vlfi^yK. \ , 13 14 MECHANICAL DRAWING. Let AB be any straight line, and P any point not inthe line.… … P is a point in space, and Pp a perpendicular from Pupon the plane ABCD. p \^t\i^ projection, then, of Pupon the plane. 13. The projection of any line, or surface, or solid, may befound by finding- the projections of all of its points.For lines and surfaces are but successions of points,and solids…
Mechanical drawing
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