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 448
and/,. Now since e2 ison the circle, centre s.„ the ray through E2 touches thesphere ; also since e., is on r2t2 the ray through E.2 intersectsRT. Similar remarks apply to /,. Hence the rays whichpass through E2 and F2 respectively touch the sphere andintersect RT. The projections of these rays are… … Example.—Describe a circle, centre c, radius i, and draw a lineadd to touch the circle at d; make ad = \, and db = \.Attach indices of 30, 20, and 15 to a, b, and c. Find thepart of the line AB whose shadow falls on the sphere C, therays being inclined at 450 and making 6o° with ba in…
