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 125
monly used for determining the perspective heights of per-pendicular lines, as well as for regulating the length anddirection of horizontal ones. It has already been explainedin Part I. pp. 9, 10, Figs. 14, 15, that those lines in an ori-ginal object that are parallel, in the perspective… … Let A represent the top of a table, perpendicularly over the PERSPECTIVE FOR STUDENTS. 91 edge of which, b, stands a sheet of glass ; let c representthe position of the spectator, and d a square figure lyingflat on the table. We should here call A the ground plane,the upright sheet of glass over B…
Perspective
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