Gravesande, Willem Jacob 's
,
An essay on perspective
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An ESSAY
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ſentation of the Figure which is in the ſecond
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Plane, is likewiſe ſimilar to the Figure which is
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in the Geometrical Plane, and the Lines com-
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poſing this Appearance to the correſpondent
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Lines in the ſecond Plane, as the Eye’s Diſtance
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from the perſpective Plane, is to its Diſtance
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from the before ſuppoſed Plane. </
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<
s
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xml:space
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">But by means
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of the Threads faſtned in the Manner aforeſaid,
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we find the Repreſentation of a Figure, whoſe
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Lines are in the aforenamed Proportion:</
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Whence this Figure is the Perſpective ſought,
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and is ſituated as it ought to be, with regard to
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the Repreſentations of the Figures in the Geo-
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metrical Plane; </
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<
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">becauſe theſe Figures are ſo
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ſlid, that the Appearance of the Perpen-
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dicular in the Point B, is only a Point. </
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ſaid Appearances are alſo in their proper Poſiti-
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ons, becauſe the Line B Q, is made to coincide
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with O N.</
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ſpective Plane.</
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<
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. VII.</
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">To find the Repreſentations of the Shadows of
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any Number of Points, being at the ſame Height
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above the Geometrical Plane.</
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">Find a Point in the Geometrical Plane,
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is the Shadow of one of the given Points: </
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poſe the Figures in the Geometrical Plane, ſo that
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the Seat of the ſaid given Point coincides with
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its Shadow; </
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<
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xml:space
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">and the Line drawn through the
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ſaid Seat, and the Shadow of the given Point,
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coincides with its Prolongation. </
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<
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cording to the Situation of the perſpective Plane,
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the Repreſentations of the Seats of the </
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