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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 68

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 68 — 48 THE ELEMENTS OF PERSPECTIVE. COROLLARY II. Let abed, Fig. 22., be any square drawn in perspective.* Draw the diagonals a d and b c, cut¬ ting each other in c. Then c is the centre of the square. Through c, draw e f to the vanishing- … point of a b, and g It to the vanishing-point of a c, and these lines will bisect the sides of the square, so that a g is the perspective representation of half the side a b ; a e is half a c; c h is half c d ; and b f is half b d.

Perspective

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