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 166
CH. IX PERSI^ECTIVE FOR SCIENCE AND ART STUDENTS 143 tri,r, and since, evidently, Sa will make a constant angle of 45°with the picture plane at every point of its rotation round theaxis SC, so every point, as h and d in the circumference of thecircle forminji the base of the cone, is a vanishing… … Fig. 110 at 45° with the picture plane [27]. The same principle appliesto every vanishing point, tlie centre of vision excepted. 53. It will be seen from this Fig. (109) that a line at anyangle with the picture or ground planes may be contained bya plane at right angles to the picture plane,…
Perspective
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