Gravesande, Willem Jacob 's, An essay on perspective

Table of handwritten notes

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        <div xml:id="echoid-div8" type="section" level="1" n="8">
          <pb o="5" file="0023" n="23" rhead="on PERSPECTIVE."/>
          <p style="it">
            <s xml:id="echoid-s251" xml:space="preserve">The Interſection V H of this Plane, and the Per-
              <lb/>
              <note position="right" xlink:label="note-0023-01" xlink:href="note-0023-01a" xml:space="preserve">Def. 11.</note>
            ſpective Plane, is the Vertical Line.</s>
            <s xml:id="echoid-s252" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s253" xml:space="preserve">And S H I, the Interſection of it, and the Geo-
              <lb/>
              <note position="right" xlink:label="note-0023-02" xlink:href="note-0023-02a" xml:space="preserve">Def. 12.</note>
            metrical Plane, is the Station Line.</s>
            <s xml:id="echoid-s254" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s255" xml:space="preserve">Points of Diſtance, are two Points in the Hori-
              <lb/>
              <note position="right" xlink:label="note-0023-03" xlink:href="note-0023-03a" xml:space="preserve">Def. 13.</note>
            zontal Line, each way diſtant from the Point of Sight
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            by the length of the principal Ray; </s>
            <s xml:id="echoid-s256" xml:space="preserve">as MN.</s>
            <s xml:id="echoid-s257" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s258" xml:space="preserve">The Geometrical Line, is a Line, that paſſes
              <lb/>
              <note position="right" xlink:label="note-0023-04" xlink:href="note-0023-04a" xml:space="preserve">Def. 14.</note>
            through the Station Point, and is parallel to the baſe
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            Line, as A B.</s>
            <s xml:id="echoid-s259" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s260" xml:space="preserve">The Seat of an Object, is the Concurrence of Per-
              <lb/>
              <note position="right" xlink:label="note-0023-05" xlink:href="note-0023-05a" xml:space="preserve">Def. 15.</note>
            pendiculars let fall from every of its Points upon the
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            Geometrical Plane, and the ſaid Plane.</s>
            <s xml:id="echoid-s261" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s262" xml:space="preserve">The Direction of a Line inclined to the Geometri-
              <lb/>
              <note position="right" xlink:label="note-0023-06" xlink:href="note-0023-06a" xml:space="preserve">Def. 16.</note>
            cal Plane, is the Interſection of the ſaid Plane, and
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            another Plane perpendicular thereto, paſſing through
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            the ſaid inclined Line.</s>
            <s xml:id="echoid-s263" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div26" type="section" level="1" n="9">
          <head xml:id="echoid-head9" xml:space="preserve">CHAP. II.</head>
          <head xml:id="echoid-head10" style="it" xml:space="preserve">The Theory of Perſpective.</head>
          <head xml:id="echoid-head11" xml:space="preserve">
            <emph style="sc">Lemma</emph>
          .</head>
          <p>
            <s xml:id="echoid-s264" xml:space="preserve">3. </s>
            <s xml:id="echoid-s265" xml:space="preserve">THE Perſpective, or Appearance of a
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            Right Line, as A B, which being con-
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            tinued, does not paſsthrough the Eye O, is like-
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              <note position="right" xlink:label="note-0023-07" xlink:href="note-0023-07a" xml:space="preserve">Fig. 3.</note>
            wiſe a right Line: </s>
            <s xml:id="echoid-s266" xml:space="preserve">For the Rays, by which the
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            Line A B is perceived, form a Plane cutting
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            the perſpective Plane; </s>
            <s xml:id="echoid-s267" xml:space="preserve">and the common Section
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            of theſe two Planes is a right Line, as a b.</s>
            <s xml:id="echoid-s268" xml:space="preserve"/>
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