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To put a Line Perpendicular to ye. ground line in Perspective
With one Vanishing Point Let A.B. be ye. line which being Perpendicular to ye. ground line will have ye. center of ye. Picture C. of course for its vanishing Point; therefore draw ye. line C. B. & from ye. Eye E. draw ye. line E. A. which intersecting C.B. in a. will give ye. line deletion addition AB /addition little /deletion a. B. ye. perspective
With two points From ye. point A. of ye. line A. B. draw at pleasure a line cutting ye. ground line as A.1; then draw from ye. Eye to ye. Horizon its Parallel E. S. & draw ye. line from S. to 1. which will intersect ye. line E. B. in a. & give ye. Perspective a. B. as before.
In ye. same manner ye. line R.r. is ye. Perspective of X.R. which by being directly in ye. center of ye. Picture becomes part of y's line. E. C. continu'd to ye. ground; so yt. it appears ye. farther a line is carried from ye. center as A. B. its appearance will be ye more oblique.
