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 149
26 COMPLETE PERSPECTIVE COURSE A visual ray from the point A intersects the P.P. in thepoint a, its perspective position. As the line AG is parallel tothe line CE (the direction of sight), the two triangles AGa andECa are similar, consequently— Cfl:«G::EC:AG. Again, a visual ray from B intersects… … presentation of a corresponding area of tlie G.P., and p theperspective position of a given point. The distance of thespectator from the P.P. being 11. Join oQ. Construct a plainscale on the line ah, with the zero point on the G.L., using anyunit. In this instance, the given point (y>) is placed…
Perspective
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