Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 239
are also onthe surface of the sphericalhollow since they are on theline of intersection ./ywhich lies in that sphericalsurface. With one auxil-iary plane we thus obtain two points in the shadow of the hollow.In Fig. 30 a number of auxiliary planes have been used to obtaina sufficient number of… … 197 28 SHADES AND SHADOWS 74. The separate and successive steps in this method ofdetermining the shadow of an object by the use of auxiliary planesare as follows: 1. Determine the shade line- by applying to the object theprojections of the ray of light. 2. Pass the auxiliary planes through the…
Architecture · Building · Carpentry
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