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 386
cles ;these are the projections of the required sphere. Examples.—1. A sphere 2 diameter rests on the ground, with itscentre C 1^ from the vertical plane. Determine a sphere,11 diameter, to touch the given one at a point P, whose planp is 2^ from xy, and i to the right of c. 2. A sphere 2|… … 372 PRACTICAL SOLID GEOMETRY chap. 306. Problem.—To determine the projections of asphere of given radius which shall touch (externally) agiven vertical cone, at a given point P on its surface. Through p draw al> parallel to xy, and draw bs atright angles to vd to intersect the elevation of the…