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 450
gh p0 intersects OV in P and the lower edge of theslab in Q; and therefore P is a point on the outline of therequired shadow. The elevation / may be found by pro-jecting from/ on ti ov at /, or, as this is not very wellconditioned, by projecting p0 to pQ, then drawing p0p theelevation of the ray… … the surface of the cone, and their projections are tangential tothe projections of the shadow at / and g. The projec-tions of N, F, and Hshould be obtained as important points. 436 PRACTICAL SOLID GEOMETRY chap. The preceding construction may be slightly varied in thefollowing manner. Choose q,…
