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 351
a or ft a line parallel to thegiven line, bearing the proportion to it that t s bears to t d. * For by the constrnction at: a t : : B T: 6 T ; and therefore thetwo triaiigles A B T, a b T, (having a common angle A T B,) are similar. 22 TUE ELEMENTS OF PERSPECTIVE. COROLLARY II. If the line a b is… … In Fig. 8. produce a 6 to the sight-line, cutting the sight-line in V; the jDoint v, thus determined, is called the Vanish-iNG-PoiNT of the line a b. Join T V. Then the student will find experimentally thatT V is parallel to a b.* COROLLARY IIL If the line a b produced would pass through some…
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