Gravesande, Willem Jacob 's
,
An essay on perspective
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The PREFACE.
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Reaſons that induc’d me to publiſh the follow-
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ing Work.</
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">Having ſome Years ago buſied my ſelf in
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drawing Figures by the common Methods, I
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found out ſeveral Compendiums; </
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">which, by
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diligent working, naturally enough fall in
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one’s way, without being entirely beholden
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to the Induſtry of others: </
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">And theſe firſt
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Succeſſes made me hope for others more
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conſiderable; </
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">and ſo I thought that a more
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narrow Inſpection into the Theory of Per-
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ſpective, might furniſh me with Rules more
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general, for making the Practice thereof
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eaſy.</
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">I then thought upon ſeveral Methods to this
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Purpoſe; </
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">but, being ſuſpicious that they were
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not ſo eaſy {as} they appear’d, I have try’d
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their Goodneſs, by exactly applying them to
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different Subjects; </
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">and have nicely examin’d
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all the Caſes, and order’d it ſo {as} not to be de-
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ceiv’d by certain Operations, which at firſt
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ſeem eaſy, but, when put in Practice, are
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quite otherwiſe. </
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">Moreover, at convenient
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Times, I look’d over the beſt Part of the
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Authors of this kind, (whoſe Number is
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increas’d very much, without any manner of
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Neceſſity) ſome of which being advantagi-
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ouſly diſtinguiſh’d among the Crowd, have
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been very uſeful to me: </
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">But I dare affirm,
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there are but a very few that give a new
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Turn to the practical Part of Perſpective.</
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