Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 254
plane makes with 11. Given the vertical projection of a vertical line al), its lowerend resting on a plane parallel to the ground line and making ananole of 30^ with II, to construct its shadow on this inclined plane.See Fig. 40. Through the point Z*^ draw the 30 line l^a^^. Thepoint a^^, the end… … \B 208 SHADES AND SHADOWS 30 (1) It will be of the same form as that of the given surface. (2) It will be of the same area. If the plane surface is a circle, the shadow can be found bytinding the shadow of its center, by Problem XVII, and with thatas a center describing a circle of the same radius…
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