Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 265
213 44 SHADES AKD SHADOWS minor axis. The shadow of the sphere on the co-ordinate plane willalso be an ellipse. The center of this ellipse, o*, will be the shadowof the center of the sphere. It will be determined by ProblemXYII. The ends of the major axis MIST, will be on the projection ofthe ray… … light BU and AP tangent to the circle, and is equal to the diameterof the sphere. The points M and IN, which determine the ends ofthe major axis, are the apexes of equilateral triangles PMR andPNTl, constructed on the minor axis as a base. 97. Problem XXX. To construct the shade line of a torus.…
Architecture · Building
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