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The elements of perspective : arranged for the use of schools and intended to be read in connexion with the first three books of Euclid (1859)

Ruskin, John, 1819-1900 · London : Smith, Elder · leaf 166

An illustration from The elements of perspective : arranged for the use of schools and intended to be read in connexion with the first three books of Euclid, 1859, leaf 166 — have now, therefore, to consider what relation the length of the line ab in this diagram, Fig. 77., has to the length of the line a b in reality. Now the line a e in Fig. 77. represents the length of a E in reality. But the angle aeb, Fig. 77., and the corresponding angle in all the constructions… … And then, if the line drawn to the measuring-line P Q is still to cut a p in b, it is evident that the line p q must

Perspective

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