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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 160

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138 [App. II. ADDITIONAL DEMONSTRATIONS. III. ANALYSIS OF PROBLEM XV. We proceed to take up the general condition of the second problem, before left unexamined, namely, that in which the vertical distances bc' and ac (Fig. 6. page 22.), as well as the direct distances t d and t d' are unequal. In…

Perspective

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