Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 212
e containing a ray of light, that is, in the sense of the ray lyitig in the plane. 10. Shade line: The line of separation between the portion of an object in light and the portion in shade is called the shade line..11. It is evident, from Fig. 1, that this shade line is the boundary of the shade.… … FlC-l 174 SHADES AND SHADOWS shade line of the given sphere is a great circle of the sphere. Theshadow of this great circle on the given plane is an ellipse. Theportion within the ellipse is the shadow of the sphere. NOTATION. 13. In the following explanations the notation usual inorthographic…
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