Imitative art;, or, The means of representing the pictorial appearances of objects, as governed by aerial and linear perspective: : being a manual of details, for the amateur sketcher and the man of business, with a chapter on finish. (1840)
Howard, Frank, 1805-1866, Darton & Clark, publisher, J. Green and Co., printer · London : Darton and Clark, Holborn Hill. · leaf 71
if an horizon be introduced^ the point or points governing the receding lines of squares, must be on that line, and that if there be no horizon, but more than one point, all the points must be upon the same line. This line is the height of the eye, and would be the horizon if one were introduced.… … be seen, and must not be represented, unless it be helow that point, because that point indicates the height of the eye, and the top of nothing can be seen unless the eye be above it. If the cylinder be in a horizontal direction, as
Drawing · Perspective · Shades and shadows · Surfaces · Drapery in art · Projection
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
