Gravesande, Willem Jacob 's, An essay on perspective

Page concordance

< >
Scan Original
31 10
32 11
33 12
34 13
35 14
36 15
37 16
38
39
40
41 17
42 18
43 19
44 20
45
46
47
48 21
49 22
50 23
51 24
52
53
54
55 25
56 26
57
58
59
60 27
< >
page |< < (58) of 237 > >|
    <echo version="1.0RC">
      <text xml:lang="en" type="free">
        <div xml:id="echoid-div203" type="section" level="1" n="107">
          <p>
            <s xml:id="echoid-s1397" xml:space="preserve">
              <pb o="58" file="0106" n="121" rhead="An ESSAY"/>
            their accidental Point F, afterwards find the Re-
              <lb/>
            preſentation of their Baſes: </s>
            <s xml:id="echoid-s1398" xml:space="preserve">This being done,
              <lb/>
            denote the Appearances of the Lines wherein
              <lb/>
            the Shores meet the Wall, upon the Perſpective
              <lb/>
            of the Wall; </s>
            <s xml:id="echoid-s1399" xml:space="preserve">the Appearances here are the
              <lb/>
            Lines p t, r s, which repreſent Lines parallel to
              <lb/>
            the Geometrical Plane, from the Suppoſition,
              <lb/>
            that the Shores are parallel between themſelves,
              <lb/>
            and their Baſes equally diſtant from the Wall.
              <lb/>
            </s>
            <s xml:id="echoid-s1400" xml:space="preserve">Finally, draw Lines from the Angles of the Re-
              <lb/>
            preſentations 1 2 3 4, to the Point F, which
              <lb/>
            will be terminated by their Interſections with
              <lb/>
            p t and r s, and will give the Appearances ſought,
              <lb/>
            as you ſee in the Figure.</s>
            <s xml:id="echoid-s1401" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div205" type="section" level="1" n="108">
          <head xml:id="echoid-head114" xml:space="preserve">
            <emph style="sc">Example</emph>
          II.</head>
          <p style="it">
            <s xml:id="echoid-s1402" xml:space="preserve">To throw ſeveral parallel Roofs of a Houſe into
              <lb/>
            Perſpective.</s>
            <s xml:id="echoid-s1403" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1404" xml:space="preserve">Having found the accidental Points G and Q
              <lb/>
              <note position="left" xlink:label="note-0106-01" xlink:href="note-0106-01a" xml:space="preserve">Fig. 39.</note>
            of the ſaid Roofs, in the Repreſentation of
              <lb/>
            the Wall ſuſtaining them, denote the Points
              <lb/>
            a b c d, wherein the ſaid Roofs meet the Wall:
              <lb/>
            </s>
            <s xml:id="echoid-s1405" xml:space="preserve">Then from the Point G draw Lines through the
              <lb/>
            Points a b c; </s>
            <s xml:id="echoid-s1406" xml:space="preserve">and from the Point Q others to
              <lb/>
            the Points b c d; </s>
            <s xml:id="echoid-s1407" xml:space="preserve">theſe Lines by their mutual
              <lb/>
            Interſection will determine each other, and give
              <lb/>
            the Repreſentations ſought.</s>
            <s xml:id="echoid-s1408" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div207" type="section" level="1" n="109">
          <head xml:id="echoid-head115" xml:space="preserve">
            <emph style="sc">Conclusion</emph>
          .</head>
          <p>
            <s xml:id="echoid-s1409" xml:space="preserve">74. </s>
            <s xml:id="echoid-s1410" xml:space="preserve">From what has been already ſaid, it will
              <lb/>
            not be difficult to throw any Objects whatſoever
              <lb/>
            into Perſpective. </s>
            <s xml:id="echoid-s1411" xml:space="preserve">But ſince it is very difficult,
              <lb/>
            and indeed impoſſible for a Painter to make a
              <lb/>
            Deſign entirely according to the Rules we have
              <lb/>
            preſcribed; </s>
            <s xml:id="echoid-s1412" xml:space="preserve">the Number of Points to be found
              <lb/>
            being almoſt infinite: </s>
            <s xml:id="echoid-s1413" xml:space="preserve">therefore the </s>
          </p>
        </div>
      </text>
    </echo>
Impressum