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 393
expedients for doing with-out such extension in fast sketching. It is evident, however, that no extension of surface couV^be of any use to us, if the distance t d, instead of being o^feet, were 100 feet, or a mile, as it might easily be in a land-scape. It is necessary, therefore, to obtain some… … Fig. 52. only to its vertical height that the law deduced from the figiu*ecould be applied. For suppose it had been a pyramid, aso Q p. Fig. 52., then the image of its side, q p, being, like everyother magnitude, limited on the glass a b by the lines comingfrom its extremities, would appear only of…
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