Percival, A. S. (Archibald Stanley), 1862- · London ; New York [etc.] : Longmans, Green and Co. · leaf 10
ht C cannotsee at all distinctly more than 30° on either side of the line of sightSC, by making CSE = 30° we can determine the upper limit of the 6 picture, and by drawing a circle of radius CE on the picture planePPl we define the boundarjof all that can be legitimately representedfor an obserser… … In Fig. 2 the line SC is supposed to be folded down into thepicture plane. This is the standard diagram from which all theperspective drawings in the following pages have been made. Better pictures will often be obtained by making SC three orfour times greater than CL, i.e. by making the angle CSL…
Perspective
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