Gravesande, Willem Jacob 's, An essay on perspective

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              <pb o="4" file="0022" n="22" rhead="An ESSAY"/>
            different Situations of the Perſpective Plane, [or
              <lb/>
            Picture] which ought to be well obſerv’d.</s>
            <s xml:id="echoid-s225" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s226" xml:space="preserve">The Interſection of the Perſpective Plane and the
              <lb/>
              <note position="left" xlink:label="note-0022-01" xlink:href="note-0022-01a" xml:space="preserve">Def. 4.</note>
            Geometrical Plane, is call’d the Baſe-Line: </s>
            <s xml:id="echoid-s227" xml:space="preserve">As
              <lb/>
            F G.</s>
            <s xml:id="echoid-s228" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s229" xml:space="preserve">The different Situation of the Eye, alters the
              <lb/>
            Repreſentation of Objects in the perſpective Plane;
              <lb/>
            </s>
            <s xml:id="echoid-s230" xml:space="preserve">for the Rays proceeding from the Object, and
              <lb/>
            concurring in ſome other Point, will likewiſe fall
              <lb/>
            upon the Perſpective Plane in different Places. </s>
            <s xml:id="echoid-s231" xml:space="preserve">And
              <lb/>
            for determining this Situation of the Eye, in re-
              <lb/>
            ſpect to the Perſpective Plane, we ſuppoſe,</s>
          </p>
          <p style="it">
            <s xml:id="echoid-s232" xml:space="preserve">A Plane parallel to the Horizon, paſſing thro’ the
              <lb/>
              <note position="left" xlink:label="note-0022-02" xlink:href="note-0022-02a" xml:space="preserve">Def. 5.</note>
            Eye, and every way extending it ſelf; </s>
            <s xml:id="echoid-s233" xml:space="preserve">and this is
              <lb/>
            call’d the Horizontal Plane: </s>
            <s xml:id="echoid-s234" xml:space="preserve">As OMVNL.</s>
            <s xml:id="echoid-s235" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s236" xml:space="preserve">The Interſection of this Plane and the Perſpective
              <lb/>
              <note position="left" xlink:label="note-0022-03" xlink:href="note-0022-03a" xml:space="preserve">Def. 6.</note>
            Plane, is the Horizontal Line. </s>
            <s xml:id="echoid-s237" xml:space="preserve">As M V N.</s>
            <s xml:id="echoid-s238" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s239" xml:space="preserve">The Perpendicular drawn from the Eye to the Ho-
              <lb/>
              <note position="left" xlink:label="note-0022-04" xlink:href="note-0022-04a" xml:space="preserve">Def. 7.</note>
            rizontal Line, is the principal Ray. </s>
            <s xml:id="echoid-s240" xml:space="preserve">As O V.</s>
            <s xml:id="echoid-s241" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s242" xml:space="preserve">The Point V, wherein the ſaid Perpendicular meets
              <lb/>
              <note position="left" xlink:label="note-0022-05" xlink:href="note-0022-05a" xml:space="preserve">Def. 8.</note>
            the Horizontal Line, is the Point of Sight, or prin-
              <lb/>
            cipal Point.</s>
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          </p>
          <p>
            <s xml:id="echoid-s244" xml:space="preserve">Note, There is a Perpendicular, let fall from
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            the Eye upon the Geometrical Plane, meaſuring
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            the Height of the Eye.</s>
            <s xml:id="echoid-s245" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s246" xml:space="preserve">The Point S, wherein the ſaid Perpendicular meets
              <lb/>
              <note position="left" xlink:label="note-0022-06" xlink:href="note-0022-06a" xml:space="preserve">Def. 9.</note>
            the Geometrical Plane, is the Station-Point.</s>
            <s xml:id="echoid-s247" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s248" xml:space="preserve">The Plane paſſing thro’ the aforeſaid Perpendicular,
              <lb/>
              <note position="left" xlink:label="note-0022-07" xlink:href="note-0022-07a" xml:space="preserve">Def. 10.</note>
            and the principal Ray, is call’d the Vertical Plane.
              <lb/>
            </s>
            <s xml:id="echoid-s249" xml:space="preserve">As SOLI.</s>
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