Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 436
o the lines LM,MU, UR, RJF, 1TO, OL. The portions TM, TO castshadows on the internal surface of the hole, and there-fore do not contribute to the outline of the shadow on theground. The student should learn from this instructive examplethat the points in which two shadows intersect may assistin… … Example.—Copy the above plan and elevation half as large againas shown, and determine the shadow on the ground when therays make 45 with xy in both plan and elevation. 422 PRACTICAL SOLID GEOMETRY chap. 337. Problem.—To determine the projections of theline of separation on the surface of a given…