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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 51

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 51 — 31 BIGHT LINE IN HORIZONTAL PLANE. C' … Then a R is to A b as a T is to A T. — — as c T is to c T. — — as T s is to T D. That is to say, a r is the sight-magnitude of A B.* * For definition of Sight- Magnitude, see Appendix I. It ought to have been read before the student comes to this problem ; but I refer to it in case it has not.

Perspective

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