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 414
y easily mistake the hori-zontal to which they belong. Thus, let a B c D, Fig. 73., be a rectangular inclined plane,and let it be required to find the vanishing-point of its diag-onal B D. Find V, the vanishing-point of a d and b c. Draw A E to the opposite vanishing-point, so that d a e… … Fio. 72. ai THE ELEMENTS OF PEUSPECTIVK Join E D, and produce it to cut the sight-line in v. Then, since the point e is vertically under the point b, thehorizontal line e d is vertically under the inclined line b d. Sothat if we now let fall the veiiical v p from v, and produce B
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