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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 132

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 132 — 110 [App. J. PRACTICE AND OBSERVATIONS take a simple instance, but must previously note another construction. It is often necessary, when pyramids are the roots of some ornamental form, to divide them horizontally at a given vertical height. The shortest way of doing so is in general the following.… … A B Fig. 58. Then by construction (Problem X.) bd and af are both of the vertical height of the pyramid. Of the diagonals, fe, d e, choose the shortest (in this case d e), and produce it to cut the sight-line in v.

Perspective

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