Gravesande, Willem Jacob 's, An essay on perspective

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        <div xml:id="echoid-div207" type="section" level="1" n="109">
          <p>
            <s xml:id="echoid-s1413" xml:space="preserve">
              <pb o="59" file="0109" n="125" rhead="on PERSPECTIVE."/>
            drawn upon the Geometrical Plane, and the
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            principal Points of the Objects without the ſaid
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            Plane, need only be thrown into Perſpective.
              <lb/>
            </s>
            <s xml:id="echoid-s1414" xml:space="preserve">Which being once obtained, he may make uſe
              <lb/>
            of theſe Appearances ſo found, as a Rule where-
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            by the reſt may be compleated by the Eye, with-
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            out running the Riſque of committing ſome
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            conſiderable Fault, which by this Means may be
              <lb/>
            avoided.</s>
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          </p>
        </div>
        <div xml:id="echoid-div209" type="section" level="1" n="110">
          <head xml:id="echoid-head116" xml:space="preserve">CHAP. IV.</head>
          <p style="it">
            <s xml:id="echoid-s1416" xml:space="preserve">Of the Practice of Peſpective upon the Per-
              <lb/>
            ſpective Plane ſtill conſider’d as being upright.</s>
            <s xml:id="echoid-s1417" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1418" xml:space="preserve">IT often happens that Painters offend all
              <lb/>
            Rules of true Appearance when they paint
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            Pictures to ſtand aloft, to be ſeen Sideways, or at
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            a confiderable Diſtance. </s>
            <s xml:id="echoid-s1419" xml:space="preserve">Their Cuſtom is to
              <lb/>
            paint Pictures to be view’d, after the ſame Man-
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            ner as they themſelves look at them when they
              <lb/>
            are working; </s>
            <s xml:id="echoid-s1420" xml:space="preserve">whence in the following Caſes,
              <lb/>
            this Practice of theirs will be uſeleſs; </s>
            <s xml:id="echoid-s1421" xml:space="preserve">and ſo to
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            avoid enormous Faults, they are neceſſitated to
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            have recourſe to Perſpective But what has been
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            ſaid in the laſt Chapter, does not reach theſe
              <lb/>
            particular Caſes; </s>
            <s xml:id="echoid-s1422" xml:space="preserve">therefore we ſhall here add ſome
              <lb/>
            new Problems, which together with the former
              <lb/>
            ones, will take in all Caſes.</s>
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          </p>
        </div>
        <div xml:id="echoid-div210" type="section" level="1" n="111">
          <head xml:id="echoid-head117" xml:space="preserve">
            <emph style="sc">Problem</emph>
          I.</head>
          <p style="it">
            <s xml:id="echoid-s1424" xml:space="preserve">75. </s>
            <s xml:id="echoid-s1425" xml:space="preserve">To throw Figures which are in the Geometri-
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            cal Plane into Perſpective, when the Eye is at ſo great
              <lb/>
            a Diſtance that it cannot be denoted in the </s>
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