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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 99

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 99 — 79 DIVIDIN G-POINTS OF INCLINED LINES. Then x and r are the dividing-points of the in¬ clined line.* Obs. The dividing-points found by the above rule, used with the ordinary measuring-line, will lay off distances on the retiring inclined line, as the ordinary dividing-points lay them off on the… … Fig. 47. Let A b, Fig. 47., be the given inclined line drawn in perspective, and A c the relative horizontal. * The demonstration is in Appendix II., p. 138.

Perspective

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