Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 247
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… … 77. The remainder of the process is, from now on, similarto the method just explained in the previous problem. See Fig. 32. We pass auxiliary planes, A, B, C, etc., (in this case parallelto H) through the scotia. We determine in plan their respective lines of intersectionwith the scotia: they will…
Architecture · Building
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