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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 385

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 385 — v. Join V V and produce it to cut the sight-line in x. Then v x is the sight-line of the inclined plane. Like tlje horizontal siglit-line, it is of indefinite length ; tTulmay l^e produced in either direction as occasion requires,crossing the honzontal line of sight, if the plane continuesdownward… … Let V X, Fig. 40., be the given sight-line.Produce it to cut the honzontal sight-line in x.Therefore x is the vanishing jx^iut of horizontal lines in thegiven inclined plune. (Problem XVIII.) KT VANISIITNG-POTNT OF STEEPEST LINES. 57 Join T X, and cli-aw t y at right angles to t x. Therefore y is…

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