Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 240
ane. 64. It is to be noted that in a cone whose elements make anangle of 35°-15-52 or less, that is, making the true angle of theray of light or less, with the co-ordinate plane, the shadow of theapex will fall within the shadow of the base, and, therefore, thecone will have no shade on its conical… … 193 24 SHADES AND SHADOWS the cylinder and the cylindrical surface shown in the plan betweenthe points h^ and d^. At these points, the projections of the rayof light are tangent, and these points in plan determine the shadeelements of the cylinder in elevation. These shade elements,a^J^ and c^d^,…
Architecture · Building
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