Gravesande, Willem Jacob 's, An essay on perspective

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            ſtill difficulter: </s>
            <s xml:id="echoid-s130" xml:space="preserve">Whence we are obliged to
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            give particular Methods for the Reſolution of
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            theſe two Problems.</s>
            <s xml:id="echoid-s131" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s132" xml:space="preserve">The reſt of the Third Chapter is concern-
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            ing Inclin’d Lines, and how to find their Ap-
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            pearance by the Accidental Point.</s>
            <s xml:id="echoid-s133" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s134" xml:space="preserve">The Fourth Chapter ſhews the Manner of
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            working on a perſpective Plane, to be view’d
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            afar off, very obliquely, or which muſt ſtand
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            in an high Place. </s>
            <s xml:id="echoid-s135" xml:space="preserve">Theſe different Situations
              <lb/>
            require new Rules: </s>
            <s xml:id="echoid-s136" xml:space="preserve">For if the common Me-
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            thods were to be uſed here, the perſpective
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            Plane muſt be ſo large, as that it would be
              <lb/>
            impoſſible to work upon it.</s>
            <s xml:id="echoid-s137" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s138" xml:space="preserve">In the Two following Chapters, we treat
              <lb/>
            of the perſpective Plane, conſider’d as Hori-
              <lb/>
            zontal, or Inclin’d: </s>
            <s xml:id="echoid-s139" xml:space="preserve">Where there are laid
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            down ſeveral general Ways of working;
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            </s>
            <s xml:id="echoid-s140" xml:space="preserve">which, together with thoſe of the foregoing
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            Chapters, will ſuffice (in my Opinion) for
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            throwing any Object whatſoever into Perſpe-
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            ctive, with Eaſe enough.</s>
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          <p style="it">
            <s xml:id="echoid-s142" xml:space="preserve">In the Seventh Chapter, which treats of
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            Shadows, there is nothing particular, but
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            what may be ſeen elſewhere: </s>
            <s xml:id="echoid-s143" xml:space="preserve">But that lit-
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            tle we have ſaid concerning this Matter, is
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            enough for giving an Idea of them, which
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            the Reading of what goes before will make
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            eaſy.</s>
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