Gravesande, Willem Jacob 's, An essay on perspective

Table of figures

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[Figure 1]
[2] fronting page 8Plate 1.Fig. 1.C A D B e E
[3] Fig. 2.M T O V R L A N D F S I H B G C
[4] Fig. 3.O b B F a A G
[5] Fig. 4.c C b d F B D a A G
[6] Plate 2.page 16.Fig. 5.@ O H F c d E D C G
[7] Fig. 6.E D O @ c F a b A C B G
[8] Fig. 7.D F H V C X a I B G E Z A
[9] Plate. 3.page 20Fig. 8.O Y D C X æ B E Z A
[10] Fig. 9.O I Y H G D V X a B E F C Z L A
[11] Plate 4.Page 24.Fig. 10.f F O G g V D N L a P E H I M A
[12] Plate 5.page 26.Fig. 11.O Y b X a E Z A B
[13] Fig. 12.M O Y F S C L D X a E B Z A
[14] Plate 6.page 28.Fig. 13.O D c b a g E G B A C
[15] Fig. 14.O b 1 2 3 a c 1 2 3 g D A C 3 1 2 2 1 3 B G
[16] page 28.Plate. 7Fig. 16Fig. 15O G F I Vl d c e m n b a h B A H M N C E P D L
[17] page 36.Plate 8Fig. 17O G F c d b a A B D C
[18] Page 36.Plate 9Fig. 18.G F C S V I E B A
[19] Fig. 19.O i M X L D @ b a
[20] Fig. 20.S x G n H S V D l R f Q m P t
[21] Fig. 21.I X f T L B N A C l M E F
[22] page 38Plate 10.Fig. 22.V F I N a G H M P D E B C L A
[23] Fig. 23.O F I H a G D E B C L A M
[24] Fig. 24.@ o f X a e A
[25] page 42Plate 11.Fig. 25.S F V M I N P H a L D E G C A B
[26] Fig. 26.Fig. 27.S V P Q R n l g h G H B N I A C M L
[27] page 46Plate 12.Fig. 28.
[28] Fig. 29.F S V q q q E L p p p I G H q D P n n n T R m m m C B Q A
[29] Fig. 30.O X E L N M G Z Y D
[30] Fig. 31.f 3 c l n m g 4
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            B and C, which will be the two moſt extreme
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            ones that can be ſeen.</s>
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        <div xml:id="echoid-div152" type="section" level="1" n="82">
          <head xml:id="echoid-head88" style="it" xml:space="preserve">To do this another Way.</head>
          <p>
            <s xml:id="echoid-s1100" xml:space="preserve">61. </s>
            <s xml:id="echoid-s1101" xml:space="preserve">If the upper Face of the Cylinder or Priſm
              <lb/>
              <note position="left" xlink:label="note-0080-01" xlink:href="note-0080-01a" xml:space="preserve">Fig. 26,
                <lb/>
              27.</note>
            be otherwiſe requir’d to be found, the ſame Things
              <lb/>
            being given as in the foregoing Method, we draw
              <lb/>
            the Line P Q in the perſpective Plane, parallel
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            to the Baſe Line, whoſe Diſtance therefrom we
              <lb/>
            make equal to the Height of the Priſm or Cy-
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            linder, whoſe Perſpective is requir’d. </s>
            <s xml:id="echoid-s1102" xml:space="preserve">Then we
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            change its Geometrical Plane, ſo that the Baſe
              <lb/>
            Line coincides with P Q, and that in this Tran-
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            ſpoſition a Perpendicular to the Baſe Line coin-
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            cides with this ſame Perpendicular continued to-
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              <note symbol="*" position="left" xlink:label="note-0080-02" xlink:href="note-0080-02a" xml:space="preserve">46.</note>
            wards P Q. </s>
            <s xml:id="echoid-s1103" xml:space="preserve">Finally we find the Perſpective of the Baſe of the Priſm or Cylinder, thus changed
              <lb/>
            in Situation by uſing P Q for a Baſe Line, and
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            the ſaid Perſpective is the Repreſentation of their
              <lb/>
            upper Faces.</s>
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        <div xml:id="echoid-div154" type="section" level="1" n="83">
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            <emph style="sc">Demonstration</emph>
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          <p>
            <s xml:id="echoid-s1105" xml:space="preserve">If we ſuppoſe the Plane of the upper Surface
              <lb/>
            of the Priſm to be continued, it will meet the
              <lb/>
            Perſpective Plane in P Q; </s>
            <s xml:id="echoid-s1106" xml:space="preserve">and the upper Face
              <lb/>
            in this Plane continued, will have the ſame
              <lb/>
            Situation in Reſpect to P Q, as the Baſe hath
              <lb/>
            on the Geometrical Plane with Regard to the
              <lb/>
            Baſe Line. </s>
            <s xml:id="echoid-s1107" xml:space="preserve">If then the ſaid continued Plane be
              <lb/>
            conceived to lye on the perſpective Plane, the
              <lb/>
            upper Faces of the Priſm or Cylinder, will be
              <lb/>
            as the Baſes changed in the Manner aforeſaid;
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            </s>
            <s xml:id="echoid-s1108" xml:space="preserve">therefore the Appearance of the ſaid Baſes
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            changed, will be that of the upper Surfaces.</s>
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          <p>
            <s xml:id="echoid-s1110" xml:space="preserve">Note, By folding the Paper it is eaſy to
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            tranſpoſe Figures, and when the Height of </s>
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