Gravesande, Willem Jacob 's, An essay on perspective

Table of figures

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[51] Page 36Plate 22Fig. 50O R E G N S M
[52] Fig. 51I H T a X
[53] Fig. 52C D X I H G a F E L b T
[54] Fig. 53H I F T x d X L B C
[55] page 64.Plate 23.Fig. 54O M P Q t A X x Q R N
[56] Fig. 55G F b T L a
[57] Fig. 56I F a X b E T C P
[58] page 66.Plate. 24.Fig. 57E A Z C P B
[59] Fig. 58F O D I a b
[60] Fig. 59F E Z C A B
[61] page 88.Plate. 25.Fig. 60O G F f Z L R P D I T S M a Q E R H N A C B
[62] Plate 26Fig. 61O I F T N S Q S H E R M A
[63] Fig. 62C D S Q L C D R P H
[64] page 96.Plate. 27Fig. 63D E C F M H I G P A Q N
[65] Fig. 64X S D E T C R L F H I G P M B O V Q N
[66] page 98.Plate. 28Fig. 65L M F G D H C E I A B
[67] Fig. 66A B VII VIII IV V H C VI VI P V VII IV S VIII E O I III II I XII XIX IX F D
[68] page 100Plate. 29Fig. 675 6p 7 8 9 10 S V VI VII VIII IX X o XI ll l
[69] Fig. 68c P G e o Q
[70] Fig. 69P c G o e Q
[Figure 71]
[Figure 72]
[Figure 73]
[74] Page 120Plate. 30.Fig. 70.X I F B H D D P O M P R C C C C C E E Q
[75] Plate 31page 120Fig. 71D G C B A H F a I E
[76] Fig. 72P G C H A N B R Q M a F
[77] Fig. 73P G C H D N B I A R Q M a F
[78] Fig. 74G N B C H M a A
[79] Fig. 75D G B C A H F I E a
[80] page 120Plate. 32.Fig. 76.
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          <p>
            <s xml:id="echoid-s732" xml:space="preserve">
              <pb o="27" file="0055" n="60" rhead="on PERSPECTIVE."/>
            actly determined, this Method ought not then to
              <lb/>
            be uſed.</s>
            <s xml:id="echoid-s733" xml:space="preserve"/>
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        <div xml:id="echoid-div98" type="section" level="1" n="55">
          <head xml:id="echoid-head57" xml:space="preserve">
            <emph style="sc">Problem</emph>
          III.</head>
          <p style="it">
            <s xml:id="echoid-s734" xml:space="preserve">44. </s>
            <s xml:id="echoid-s735" xml:space="preserve">To find the Appearance of the Diviſions of a
              <lb/>
            Line in the Geometrical Plane.</s>
            <s xml:id="echoid-s736" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s737" xml:space="preserve">Let A B be a Line, whoſe Appearance is ab.
              <lb/>
            </s>
            <s xml:id="echoid-s738" xml:space="preserve">
              <note position="right" xlink:label="note-0055-01" xlink:href="note-0055-01a" xml:space="preserve">Fig. 14.</note>
            Now to find the Repreſentation of the Diviſions
              <lb/>
            of this Line, there muſt be Lines drawn from
              <lb/>
            the Diviſions of the Line to the Eye, whoſe
              <lb/>
            Interſections with a b will give the Points
              <lb/>
            ſought.</s>
            <s xml:id="echoid-s739" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s740" xml:space="preserve">Note, When theſe Lines very obliquely cut
              <lb/>
            a b, the following Way ought to uſed.</s>
            <s xml:id="echoid-s741" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div100" type="section" level="1" n="56">
          <head xml:id="echoid-head58" xml:space="preserve">
            <emph style="sc">Method</emph>
          . II.</head>
          <p>
            <s xml:id="echoid-s742" xml:space="preserve">45. </s>
            <s xml:id="echoid-s743" xml:space="preserve">To find the Repreſentations of the Di-
              <lb/>
            viſions of the Line G C, make choice of the
              <lb/>
              <note position="right" xlink:label="note-0055-02" xlink:href="note-0055-02a" xml:space="preserve">Fig. 14.</note>
            Point D at Pleaſure without this Line, and find
              <lb/>
            the Repreſentation d thereof; </s>
            <s xml:id="echoid-s744" xml:space="preserve">then draw
              <note symbol="*" position="right" xlink:label="note-0055-03" xlink:href="note-0055-03a" xml:space="preserve">21.</note>
            through the propoſed Diviſions to the Point D;
              <lb/>
            </s>
            <s xml:id="echoid-s745" xml:space="preserve">and from the Points wherein theſe Lines con-
              <lb/>
            tinued out cut the Baſe Line, draw other Lines
              <lb/>
            through the Repreſentation d, which will cut c g
              <lb/>
            the Repreſentation of C G in the Points ſought.</s>
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        <div xml:id="echoid-div102" type="section" level="1" n="57">
          <head xml:id="echoid-head59" xml:space="preserve">
            <emph style="sc">Problem</emph>
          IV.</head>
          <p style="it">
            <s xml:id="echoid-s747" xml:space="preserve">46. </s>
            <s xml:id="echoid-s748" xml:space="preserve">To throw a Polygon, or any other regular
              <lb/>
            Figure on the Geometrical Plane into Perſpective.</s>
            <s xml:id="echoid-s749" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s750" xml:space="preserve">The Repreſentation of any Kinds of Figures
              <lb/>
            may be found by any one of the Methods
              <note symbol="*" position="right" xlink:label="note-0055-04" xlink:href="note-0055-04a" xml:space="preserve">21.</note>
            Problem I. </s>
            <s xml:id="echoid-s751" xml:space="preserve">the fourth in general is the eaſieſt;
              <lb/>
            </s>
            <s xml:id="echoid-s752" xml:space="preserve">and may be firſt uſed in finding the
              <note symbol="*" position="right" xlink:label="note-0055-05" xlink:href="note-0055-05a" xml:space="preserve">22.</note>
            ſentations of Points, or ſometimes of one
              <lb/>
            only; </s>
            <s xml:id="echoid-s753" xml:space="preserve">and then the fifth Method ſerves
              <note symbol="*" position="right" xlink:label="note-0055-06" xlink:href="note-0055-06a" xml:space="preserve">31.</note>
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