Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 168
Ufl| 1 llB ^ III 1M t/l\r ,T Fig. 303. Fig. 304. In Fig. 303 the three sides of the hexagonal pyramid. A B F, A B C, andA C D, alone receive the light; consequently the edges A F and A D arethe lines of shade. To determine the shadow cast by these two lines, drawfrom the projections of the vertex… … SHADES AND SHADOWS. 151 lei to the ray of light; then erect at the points a perpendicular to the groundline, which gives at a the shadow of the vertex on the horizontal plane on theother side of the ground line ; and finally join this last point, a\ with the pointsD and F ; the lines D o! and F a!…
Mechanical drawing
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