Gravesande, Willem Jacob 's
,
An essay on perspective
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different Situations of the Perſpective Plane, [or
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Picture] which ought to be well obſerv’d.</
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s
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">The Interſection of the Perſpective Plane and the
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note-0022-01
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note-0022-01a
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xml:space
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">Def. 4.</
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Geometrical Plane, is call’d the Baſe-Line: </
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F G.</
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<
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">The different Situation of the Eye, alters the
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Repreſentation of Objects in the perſpective Plane;
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</
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">for the Rays proceeding from the Object, and
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concurring in ſome other Point, will likewiſe fall
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upon the Perſpective Plane in different Places. </
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for determining this Situation of the Eye, in re-
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ſpect to the Perſpective Plane, we ſuppoſe,</
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">A Plane parallel to the Horizon, paſſing thro’ the
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Eye, and every way extending it ſelf; </
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call’d the Horizontal Plane: </
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<
s
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">The Interſection of this Plane and the Perſpective
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<
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note-0022-03
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Plane, is the Horizontal Line. </
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rizontal Line, is the principal Ray. </
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the Horizontal Line, is the Point of Sight, or prin-
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cipal Point.</
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<
s
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">Note, There is a Perpendicular, let fall from
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the Eye upon the Geometrical Plane, meaſuring
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the Height of the Eye.</
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<
s
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">The Point S, wherein the ſaid Perpendicular meets
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<
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the Geometrical Plane, is the Station-Point.</
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<
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">The Plane paſſing thro’ the aforeſaid Perpendicular,
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<
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and the principal Ray, is call’d the Vertical Plane.
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