A rudimentary and practical treatise on perspective for beginners : simplified for the use of juvenile students and amateurs in architecture, painting, etc., also adapted for schools and private instructors (1866)
Pyne, George · London : Virtue Brothers & Co. · leaf 135
spectator. Whatever may be the direction of any Jneon the plan for which a vanishing point is required, it isfound by ruling a line (parallel to the line on the plan) fromthe point marking the position of the spectator, and con-tinuing the same till it intersects the plane of delineation ; thepoint… … c position of a square, b the plane of delineation, and c theposition of the spectator. The lines a b and c d beingparallel lines in the geometrical plan, in the perspectiverepresentation must tend to the same point; to find thispoint, the edge of a parallel rule must be placed againsteither a h or…
Perspective
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