Gravesande, Willem Jacob 's
,
An essay on perspective
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on PERSPECTIVE.
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drawn upon the Geometrical Plane, and the
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principal Points of the Objects without the ſaid
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Plane, need only be thrown into Perſpective.
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</
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<
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">Which being once obtained, he may make uſe
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of theſe Appearances ſo found, as a Rule where-
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by the reſt may be compleated by the Eye, with-
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out running the Riſque of committing ſome
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conſiderable Fault, which by this Means may be
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avoided.</
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<
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">Of the Practice of Peſpective upon the Per-
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ſpective Plane ſtill conſider’d as being upright.</
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<
s
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">IT often happens that Painters offend all
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Rules of true Appearance when they paint
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Pictures to ſtand aloft, to be ſeen Sideways, or at
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a confiderable Diſtance. </
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<
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">Their Cuſtom is to
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paint Pictures to be view’d, after the ſame Man-
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ner as they themſelves look at them when they
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are working; </
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<
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xml:space
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">whence in the following Caſes,
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this Practice of theirs will be uſeleſs; </
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<
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xml:space
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">and ſo to
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avoid enormous Faults, they are neceſſitated to
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have recourſe to Perſpective But what has been
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ſaid in the laſt Chapter, does not reach theſe
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particular Caſes; </
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<
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">therefore we ſhall here add ſome
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new Problems, which together with the former
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ones, will take in all Caſes.</
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<
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I.</
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">To throw Figures which are in the Geometri-
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cal Plane into Perſpective, when the Eye is at ſo great
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a Diſtance that it cannot be denoted in the </
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