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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 359

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 359
RAW A HORIZONTAL LINE, GIVEN IN POSITION AND MAGNITUDE,BY MEANS OF ITS SIGHT-MAGNITUDE AND DIVIDING-POINTS- Let a b (Fig. 16.) be the given line. Find the position of the point a in a. Find the vanishing-point v, and most convenient dividing-point, M, of the line a b. Join a V. Through a draw a… … Fio. 17. i GIVEN LINE IN HORIZONTAL PLANE. 31 COROLLARY I. Supposing it were now required to draw a line a c (Fig. 17.)twice as long* as a b, it is evident that the sight-magnitudea d must be twice as long as the sight-magnitude a h; wehave, therefore, merely to continue the horizontal line ah\make…

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