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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 383

An illustration from St. Mark's rest : the history of Venice written for the help of the few travellers who still care for her monuments, 1885, leaf 383 — nd d y, cutting the line x y in x and y. Then x and y are the dividing-points of the inclined line.* Ohs. The dividing-points found by the above rule, usedwith the ordinarv measurinq-line, will lav off distances on theretiring inclined line, as the ordinary dividing points lay themoff on the… … Fig. 47. Let A B, Fig. 47., be the given inclined line drawn in per-spective, and A c the relative horizontal Find the vanishing-points, v and e, of a c and a b ; d, thedividing-point of \ c ; and the sight-magnitude of a c on themeasuring-line, or a c. From D erect the perpendicular d f. Join c B,…

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