An introduction to perspective : practical geometry, drawing and painting : a new and perfect explanation of the mixture of colours, with practical directions for miniature, crayon, and oil painting : in a series of familiar dialogues between the author's children, and letters addressed to his pupils : illustrated with numerous wood engravings, from drawings by John Hayter ..., and coloured plates (1845)
Hayter, Charles, 1761-1835, Hayter, John, 1800-1895 · London : Samuel Bagster and Sons ... · leaf 98
would form the vanishing point of the visible side of the roof, which is an inclined plane, of which the lines a and b are the two edges : this point always falls on that perpendicular line which would arise from that original vanishing point on the horizon, towards which the side of the figure… … by the process used in drawing fig. 107 (which you may take as a general rule for drawing the perspective view of a cube, when viewed in the like position, and when you are not confined to any particular scale of measurement): now divide the top line of the hithermost side of the cube in half, and…
Perspective · Drawing · Color · Painting
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.