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 415
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 … Fio. 73. B D to cut v p in p, tlie point p will be the vanishing-point ofB D, and of all lines parallel to it.* * The student may perhaps understaiul this construction better bycompleting the rectangle A D F E, drawing D F to the vanishing-point ofA E, and e F to v. The whole figure, b F, may then…
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