Gravesande, Willem Jacob 's
,
An essay on perspective
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An ESSAY
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tal Plane, or one of the Points of Diſtance on the
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Horizontal Line.</
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<
s
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xml:space
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">The Repreſentation of two Points of theſe
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Figures muſt be firſt found ; </
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<
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xml:space
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">24.</
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of theſe two Points the Appearances of others
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may be had .</
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<
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<
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pearance is requir’d; </
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V F the ſixth Part of the Eye’s Diſtance from
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the perſpective Plane. </
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<
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xml:space
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Appearance of B and E, by means of which,
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the Appearance of the Point A will be had .</
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In like Manner, by means of the Repreſenta-
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tion of A and E, will that of D be had; </
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by uſing B and A, the Perſpective of C may be
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found.</
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<
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lar to the Geometrical Plane ; </
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<
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inclined thereto , may be found by the
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of the precedent Chapter.</
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<
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II.</
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cal Plane into Perſpective, when the Eye is ſo oblique
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that it cannot be marked in the Horizontal Plane,
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or the Point of Sight in the Horizontal Line.</
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<
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rections of the precedent Problem, after having
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found the Perſpective of ſeveral Points of the
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given Figures.</
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<
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">At any Point C, taken at Pleaſure in the Baſe
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Line, draw the Perpendicular C D to the ſaid
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<
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Line, and likewiſe draw the Line C E from the
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ſame Point in ſuch manner, that if it could </
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