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 421
les a p v and a v t, e b: ef : : p v : v t. Therefore p v : v t :: e b : a e. And, by construction, angle tpy — z aeb. THE ELEMENTS OF PERSPECTIVE. Therefore the triangles t v p, a e b, are similar ; and t i> isparallel to a b. Now the construction in this jDrohlem is entirely general forany… … Fio. 77. f^g V p in p, p will be the vanishing-point of a b, and (by thesame proof as that given at j^age 21.) of all lines parallel to it. Next, to find the dividing-point of the inclined line, I remove some unnecessarv lines from the last fijnire and r^peat it here, Fig. 77., adding the…
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