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 384
ssume that the spheres with centres A and B areplaced so that AB is parallel to the vertical plane. Describe circles, centres a and b, to touch xy andeach other, their radii being those of the spheres A and B.These circles are the elevations of two of the spheres.Draw their plans with ab parallel… … M^7