St. Mark's rest : the history of Venice written for the help of the few travellers who still care for her monuments (1885)
Ruskin, John, 1819-1900 · New York : Lovell · leaf 356
RIGHT LINE IN HORIZONTAL PLANE. 27 So that, in order to determine the length of a b, we neednot draw the long and distant line a b, but only a r paral-lel to it, and of its sight-magnitude ; which is a great gain,for the line A b may be two miles long, and the line a bperhaj^s only two inches.… … FiG. 13. Through the points r and b draw r m, cutting the sight-lii..in M. Join t v. Now the reader will find experimentally thatV M is equal to v t.* Hence it follows that, if from the vanishing-point v we lay o3on the sight-line a distauce,v m, equal to v t; then draw througha a horizontal line…
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