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 422
should only liave to proceed to modify Corollary ITL of Prob-lem 11. to this new construction. We shall see presently thatA B does not represent the actual length of the inclined lineA B in nature, nevertheless we shall first proceed as if it did,and modify our result afterwards. In Fig. 77, draw a… … Set off on the measuring-line a m equal to a d. Draw b q parallel to a m, and through b draw m q, cuttingp Q in Q. Then, by the proof already given in page 25, p q = p t. Therefore if p is the vanishing-point of an inclined line a b,and Q p is a tiprizontal line drawn through it, make p q equalto p…
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