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 278
ions, and the vertical trace 1mis readily obtained as shown, since A is in the plane. For, a plane which touches the two vertical cones hasthe given inclination ; it also passes through the given pointA, and touches the sphere centre C, and therefore istangential to the cone whose elevation is auw.… … 3.4. Examples.—1. A point A is 2 in front of the vertical plane, andI A above the ground. A point B is 1^ to the left of A, \below it, and J farther from the vertical plane. Determine thetraces of two planes each containing AB and inclined at 500 tothe ground. 2. The traces vt, th of a plane make…
