Gravesande, Willem Jacob 's, An essay on perspective

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              <pb o="ii" file="0010" n="10" rhead="The PREFACE."/>
            Reaſons that induc’d me to publiſh the follow-
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            ing Work.</s>
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            <s xml:id="echoid-s45" xml:space="preserve">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; </s>
            <s xml:id="echoid-s46" xml:space="preserve">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: </s>
            <s xml:id="echoid-s47" xml:space="preserve">And theſe firſt
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            Succeſſes made me hope for others more
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            conſiderable; </s>
            <s xml:id="echoid-s48" xml:space="preserve">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.</s>
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            <s xml:id="echoid-s50" xml:space="preserve">I then thought upon ſeveral Methods to this
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            Purpoſe; </s>
            <s xml:id="echoid-s51" xml:space="preserve">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; </s>
            <s xml:id="echoid-s52" xml:space="preserve">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. </s>
            <s xml:id="echoid-s53" xml:space="preserve">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: </s>
            <s xml:id="echoid-s54" xml:space="preserve">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.</s>
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