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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 143

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 143 — 121 Prob. XIV.] ON THE PRECEDING PROBLEMS. straight. But if these lines of profile are curved, the problem becomes much more complex : once mastered, however, it leaves no farther difficulty in perspective. Let it be required to draw a flattish circular cup or vase, with a given curve of profile.… … Two squares (of the required size) are first drawn, one above the other, with a given vertical interval, a c, be¬ tween them, and each is divided into eight parts by its diameters and diagonals. In these squares two circles are drawn ; which are, therefore, of equal size, and one above the other.…

Perspective

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