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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 381

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 381 — perspective by Problem XV., and a c the relative horizontal(a c in Figs. 39., 40.), also drawn in perspective. Through v, the vanishing-point of a c, draw the vertical p pupwards and downwards. Produce a y (or c y), cutting p p in (p or p). * The demonstration is in Appendix II. Article III. 52 THE… … Pm. 45. given inclined line by Problem XV. Practically, it is alwaysnecessary to do so, and, therefore, I give the problem in thisform. Theoretically, as will be shown in the analjsis of the prob- DIVIDING-POINTS OF INCLINED LINES. 53 lem, the point p should be found by drawing a line from…

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