Complete perspective course : comprising the elementary and advanced stages of perspective, the projection of shadows and reflections, with exercises in theory and practice, also the practical application of perspective (1900)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan and co. · leaf 206
for instance, we make an elevation of it, a3 Ca. Xowthe line Sg, which is the H.T. of the plane P, must be at rightangles to Ca ; and the line r/f or V.L., in v\hich the plane Pmeets the P.P., must be at right angles to Ca. This will beseen from the following :— If the angles of inclination of the… … Fi<r. 131 angle of 50°. Assume Cdc to be a vertical plane ; this plane isat right angles to the plane P, consequently Ced is the angleat which P is inclined to a horizontal plane, or to the G.P. [86].Since the angle Ccd = GO, the angle cCd must be 30. Xext,since Cbd is a plane at right angles to…
Perspective
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