Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 238
auxiliary planes to advantage, \olien the plane ofthe line whose shadow is to hecast is parallel to one of theco-ordinate planes. 73. Problem XIII. To findthe shadow in a spherical hoI=Jew. Fig. 29 shows in plan andelevation a spherical hollowwhose plane has been assumedparallel to Y. xVpplying to… … its of this shade line ci^c^li. The remaining portion of the linea^d^h^ is not a shade line since the light would reach the sphericalsurface adjacent to it and also reach the plane surface on the otherside of ayd^h outside the spherical hollow. We must now cast the shadow of the line a^c^h on the…
Architecture · Building · Carpentry
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