The Elements of Perspective / arranged for the use of schools and intended to be read in connection with the first three books of Euclid

by John Ruskin

b

may be determined by it. For let A B, [Fig. 10.], be the given line, constructed upon the paper as in [Fig. 8.]; and let it be required to draw the line

a b

without using the point C′.

Fig. 10.

Find the position of the point A in

a

. ([Problem I].)

[p19]
]Find the vanishing-point of A B in V. ([Problem III].)