A manual of elementary geometrical drawing, involving three dimensions. Designed for use in high schools, academies, engineering schools, etc. : and for the self-instruction of inventors,artizans, etc. ... In five divisions .. (1867)
Warren, S. Edward (Samuel Edward), 1831-1909 · New York : J. Wiley and son · leaf 98
make equal angles with a perpendicular to a sur-face. But wC is the incident and Ce the reflected ray, to the eye ;hence at d is the point, on the surface, where they make equalangles with the perpendicular (normal) c?C, and the vertical line atd—d is the lightest line. 187. MemarJc.—The qvxestion… … n J- - -^ 1 ^^V-. /,/-wV„-^ The >tii,t.t Kiun, EiiillTi .HiilLTo 4M l„,ta;. K SHADING. 73 invisible. Let us now suppose a reflecting medium, though animperfect one, as the atmosphere, to be thrown around the body.By reflection, every part of the body vtould receive some hght fromall directions, and…
Geometrical drawing · Mechanical drawing
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