Gravesande, Willem Jacob 's
,
An essay on perspective
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0177
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206
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rhead
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on PERSPECTIVE.
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xml:space
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">The Uſe of the
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in Deſigning.</
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<
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">EVery one knows how eaſy it is by one Convex Glaſs
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only, to repreſent outward Objects in any darken’d
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Place, according to their natural Appearances, where
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the Livelineſs of Colours, and the Diverſity of Mo-
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tions, are wonderfully pleaſant to behold; </
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<
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xml:space
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">and it is
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ſo eaſy to make this Invention uſeful in Deſigning,
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that our treating of it ſo fully as we have done, is
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undoubtedly ſomething neceſſary.</
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<
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">A few Hints and Obſervations ſeem to be ſufficient
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for putting a diligent Perſon in the way of contriving
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himſelf ſome Machine to perform the Uſes hereafter
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mentioned; </
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<
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xml:space
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">whence we might have let him bad the
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Pleaſure of the Invention himſelf, after it was made
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eaſy to him. </
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<
s
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">And this indeed is what I firſt reſolv’d
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upon; </
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<
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">but afterwards conſidering that in the Con-
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ſtruction of a Machine for facilitating the Buſineſs of
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Deſigning, ſeveral Things cannot be foreknown till
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try’d; </
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">and that much Time may be ſpent in vain, and
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ſeveral Methods attempted, before one of theſe Ma-
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chines can be made ſimple and uſeful, as I have found
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by Experierce: </
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<
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">Therefore, that others may not be at
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this Trouble, I ſhall here lay down the Deſcription of
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two Machines (hoping it will not be unacceptable)
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which after ſeveral Alterations, in my Opinion, are
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now made convenient enough.</
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