Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 246
el to V, the line of intersection will then coincide withthis profile cC^c^^ the point ct^ having moved to the point a^. If, before revolving, we had drawn the projections of the rayof light, R^, through the point rt^, they would be the lines a^h^and aH>^. After the revolution of the plane P… … 199 30 SHADES AND SHADOWS the profile n^c^^ indicates that the ray H^ has pierced the scotiasurface. If now tlie plane P is revolved back to its original posi-tion, this point a^ will move in a horizontal line in elevation tothe point rt^^, and the point a^^ thus obtained is the shadow of thepoint…
Architecture · Building
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