Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 248
es of intersection with the object and to these lines of inter-section can be applied the projections of the rays of light which liein the auxiliary planes of light. The points of contact or tangency,as the case may be, of the projections of the rays and the line ofintersection are points in the… … 201 32 SHADES AND SHADOWS ate and convenient method is given later in Problem XXIX fordetermining tlie shade line of the sphere and its shadow, 81. Problem XV. To find the shade line of a sphere. In Fi(T. 33 is shown the phin and elevation of a sphere.Through the sphere in plan, pass the auxiliary…
Architecture · Building
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