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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 129

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 129 — 107 Prob. IX.] ON THE PRECEDING PROBLEMS. Interior angles, such as ebc, Fig. 55. (suppose the comer of a room), are to be treated in the same way, each side of the room having its measurements separately … carried to it from the measuring-line. It may sometimes happen in such cases that we have to carry the measure¬ ment up from the comer b, and that the sight-magnitudes are given us from the length of the line ab. For in¬ stance, suppose the room is eighteen feet high, and there¬ fore a b is…

Perspective

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$An illustration from Opticks, or, A treatise of the reflexions, refractions, inflexions and colours of light ; Also two treatises of the species and magnitude of curvilinear figures (1704)$