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 387
s diameter a c is at right angles to the horizontal lines ti-av-ei-sing the surface of the inclined plane, the line e c, being inthis semicircle, is also at right angles to such traversing lines. * That is to say, the vanishing-point of horizontal lines drawn atright angles to the lines whose… … i Pig. 30. The preceding series o^ constructions, with tiie examples inthe first Article of the Appendix, put it in tne power of thestudent to draw an} form, however complicated,* which doe? * As in algebraic science, much depends, ni ;j»»mplicated perspective,on tlie student s ready invention of…
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