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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 83

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 83 — DIVISION OF CIRCLE INTO UNEQUAL PARTS. 63 If from each of the points jp, q, r, a vertical were raised to the line e g, as in Fig. 31., and from the point where it cut eg a line were drawn to the vanishing-point, as Q q' in Fig. 31., this line would also determine two of the points of division. If… … lines from a and b to the side of the perspective square x Y, and then draw to the vanishing-point, cutting the perspective circle in a and b, the points required. Only notice that if any point, as A, is on the nearer side of the circle abc, its representative

Perspective

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