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 394
h, oc — 2. Regard rQs15and f-5e10 as the scales of slope of two planes. Determine theplan of a cone, vertical angle 45°, which lies between the planesso as to touch them. Unit 0.1. 2. Determine the plan and elevation of a cone of indefinite length, vertical angle 6o°, to which the planes of… … General Examples.—1. Three spheres of diameters 2, ih, and1 rest on the ground in mutual contact, antl a fourth sphere, |diameter, rests on the three. Draw the plan of the group.Draw also the plan of the triangular pyramid which circum-scribes the spheres, showing the three points of contact oneach…