Gravesande, Willem Jacob 's, An essay on perspective

Table of figures

< >
[31] page 48.Plate 13.Fig. 32.V S R L P B D Q T M I F A E Y C G O H Z N
[32] page 52.Plate. 14.Fig. 34D C F G A B H L E
[33] Fig. 33S X 8 1 h 6 g 3 z q 9 m 2 4 m a 5 Y
[34] Fig. 35O M D P T Q R m p q B A S C
[35] page 56.Plate. 15F H O Z D G
[36] Fig. 36T N M L a R Q E I A C P B
[37] Fig. 37F S V T I E M A N X P C B
[38] page 58.Plate. 16Fig. 39Fig. 38F Q O p l r s 1 2 3 4 G
[39] page 60.Plate. 17F V
[40] Fig. 40c θ b e a F G H I K L A B E C D
[41] page 64Plate. 18.d v
[42] Fig. 41E b a G F H C B A D
[43] Fig. 42G Q A M I S E H T B L Z F P a X Y N C D R O
[44] page 68Plate. 19Fig. 43B D E a G H I C F L
[45] Fig. 44O V X S H I T
[46] Fig. 45Q F V X S a H B C D E L M P T A
[47] page 72Plate. 20Fig. 46V I X a E M P A T
[48] Fig. 47V F X a Q G H D N A T R
[49] Page 34.Plate. 21Fig. 48F O D X S b a G N A E T B P C
[50] Fig. 49H F O D G X a M N L R Q
[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
< >
page |< < (13) of 237 > >|
    <echo version="1.0RC">
      <text xml:lang="en" type="free">
        <div xml:id="echoid-div54" type="section" level="1" n="26">
          <p>
            <s xml:id="echoid-s439" xml:space="preserve">
              <pb o="13" file="0033" n="34" rhead="on PERSPECTIVE."/>
            and the Objects ſtand; </s>
            <s xml:id="echoid-s440" xml:space="preserve">and the Perſpective
              <lb/>
            Plane, as a Window between the Spectator and
              <lb/>
            the Objects, in which the Objects are requir’d
              <lb/>
            to be repreſented. </s>
            <s xml:id="echoid-s441" xml:space="preserve">But, in Practice, this Matter
              <lb/>
            muſt be quite otherwiſe conceiv’d; </s>
            <s xml:id="echoid-s442" xml:space="preserve">which I
              <lb/>
            ſhall now endeavour to explain as clear as poſ-
              <lb/>
            ſible.</s>
            <s xml:id="echoid-s443" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s444" xml:space="preserve">Suppoſe then, that a Painter has a mind to
              <lb/>
            draw upon his Perſpective Plane, or Picture,
              <lb/>
            (whoſe Bigneſs is as he thinks fit) a Proſpect of
              <lb/>
            a Country, wherein are Trees, Houſes, Rivers, & </s>
            <s xml:id="echoid-s445" xml:space="preserve">c.
              <lb/>
            </s>
            <s xml:id="echoid-s446" xml:space="preserve">Now, from what has been ſaid, this Country
              <lb/>
            will be his Geometrical Plane; </s>
            <s xml:id="echoid-s447" xml:space="preserve">and he ought to
              <lb/>
            conſider his Perſpective Plane as a Window, up-
              <lb/>
            on which the Points thro’ which the Rays com-
              <lb/>
            ing from all the Points of the Objects towards
              <lb/>
            the Eye, muſt be found. </s>
            <s xml:id="echoid-s448" xml:space="preserve">But theſe Interſections
              <lb/>
            of the Rays and the Window cannot be deter-
              <lb/>
            min’d, unleſs by Lines being drawn in the Geo-
              <lb/>
            metrical Plane to the Baſe Line.</s>
            <s xml:id="echoid-s449" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s450" xml:space="preserve">Now, it is impoſſible for Painters to draw Lines
              <lb/>
            of this Nature on the Ground; </s>
            <s xml:id="echoid-s451" xml:space="preserve">wherefore they
              <lb/>
            uſe another more convenient Geometrical Plane
              <lb/>
            thus. </s>
            <s xml:id="echoid-s452" xml:space="preserve">At the Foot of their Perſpective Plane,
              <lb/>
            they place a Plane, upon which are drawn in
              <lb/>
            Minature the Baſes of Houſes and Trees, which
              <lb/>
            are in the Country to be repreſented; </s>
            <s xml:id="echoid-s453" xml:space="preserve">and the
              <lb/>
            Seats of the Points which, in the Objects, are
              <lb/>
            elevated above the Country; </s>
            <s xml:id="echoid-s454" xml:space="preserve">always obſerving,
              <lb/>
            that there be the ſame Diſpoſition between the
              <lb/>
            Objects and their different Parts, upon this new
              <lb/>
            Geometrical Plane, as the Objects truly have in
              <lb/>
            the Country to be repreſented.</s>
            <s xml:id="echoid-s455" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s456" xml:space="preserve">Now, to determine the Magnitude of the
              <lb/>
            Space the Figures muſt take up upon this Geo-
              <lb/>
            metrical Plane, a Painter muſt firſt chuſe the
              <lb/>
            Diſpoſition of his Eye in reſpect to the </s>
          </p>
        </div>
      </text>
    </echo>