Gravesande, Willem Jacob 's, An essay on perspective

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          <pb o="v" file="0013" n="13" rhead="The PREFACE."/>
          <p style="it">
            <s xml:id="echoid-s82" xml:space="preserve">The Practice of Perſpective may be made
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            eaſy, by the Three following Things in this
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            Treatiſe: </s>
            <s xml:id="echoid-s83" xml:space="preserve">Viz. </s>
            <s xml:id="echoid-s84" xml:space="preserve">1. </s>
            <s xml:id="echoid-s85" xml:space="preserve">In giving ſeveral new
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            and eaſier Ways (than thoſe commonly uſed)
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            of ſolving the moſt general Problems upon
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            which the whole Practice is founded: </s>
            <s xml:id="echoid-s86" xml:space="preserve">And the
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            Reaſon why we have laid down ſeveral So-
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            lutions, is, becauſe the ſame Way is not always
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            equally convenient in all Caſes; </s>
            <s xml:id="echoid-s87" xml:space="preserve">whence it is
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            neceſſary to have ſeveral, that ſo we may
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            chuſe one beſt ſuiting our Purpoſe. </s>
            <s xml:id="echoid-s88" xml:space="preserve">2. </s>
            <s xml:id="echoid-s89" xml:space="preserve">The
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            general Methods, which have been us’d hi-
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            therto, not being practicable on ſome particu-
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            lar Occaſions; </s>
            <s xml:id="echoid-s90" xml:space="preserve">to remedy this, we have ad-
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            ded others to them; </s>
            <s xml:id="echoid-s91" xml:space="preserve">which are indeed more
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            difficult, but (in ſome Caſes) there is an ab-
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            ſolute Neceſſity for them. </s>
            <s xml:id="echoid-s92" xml:space="preserve">3. </s>
            <s xml:id="echoid-s93" xml:space="preserve">When it is ve-
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            ry difficult to reſolve a particular Problem,
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            by means of general ones; </s>
            <s xml:id="echoid-s94" xml:space="preserve">then we have
              <lb/>
            thought it convenient to give a particular So-
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            lution thereof.</s>
            <s xml:id="echoid-s95" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s96" xml:space="preserve">By this means, the Study of Perſpective
              <lb/>
            becomes indeed more difficult; </s>
            <s xml:id="echoid-s97" xml:space="preserve">but the Diſ-
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            advantage is well recompenſed by the Faci-
              <lb/>
            cility of the Practice, which we have entire-
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            ly had in view. </s>
            <s xml:id="echoid-s98" xml:space="preserve">It is true, that a few ge-
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            neral Rules do not ſo much burthen the Me-
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            mory; </s>
            <s xml:id="echoid-s99" xml:space="preserve">but when one has ſeveral general
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            ones, and alſo particular ones, by them we
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            can abridge Matters. </s>
            <s xml:id="echoid-s100" xml:space="preserve">And this Method </s>
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