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 254
le of 70° with the vertical. Set off theseangles at s with d.p, and produce them to meet the verticalline through f in the points p) and p. Thenp is the a.v.i?. for XI SCIOGRAPHV OR THE PROJECTION OF SHADOWS 231 lines at right angles to the plane J/, andy/ for lines parallel \oM and at right angles… … Fig. 163 therefore the reflection of the G.P. must also be inclined at anangle of 70° with M. Consequently the reflected G.P. will forman angle of 140^ with the G.P. (70° + 70° = 140°), i.e. anangle of 50° with the vertical (140 — 90° = 50°), and a line atright angles to the reflected G.P. will…
Perspective
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