Elementary perspective arranged to meet the requirements of architects, draughtmen, and students (1913)
Crosskey, Lewes R · London, Backie and son ltd · leaf 13
lane is frequently used in perspective, as the diflFerent lines andfaces composing an object are considered to lie in planes for the purpose of workingthe prohlems. A plane surface is such that the straight line joining any two pointswhich can possibly be assumed on it, lies entirely in the surface… … Fig. 2. In fig. 2 the triangle ABC lies in plane 1, or as it is usually expressed, plane 1contains the triangle A B C- The line A C can be contained by an indefinite number of planes.The line A C is shown as being contained by planes 1, 2, and 3. Fig. 3,
Perspective
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