Gravesande, Willem Jacob 's, An essay on perspective

Page concordance

< >
Scan Original
101 47
102 48
103
104
105
106 49
107 50
108 51
109 52
110
111
112
113 53
114 54
115 55
116 56
117
118
119
120 57
121 58
122
123
124
125 59
126 60
127
128
129
130 61
< >
page |< < (105) of 237 > >|
    <echo version="1.0RC">
      <text xml:lang="en" type="free">
        <div xml:id="echoid-div367" type="section" level="1" n="200">
          <p>
            <s xml:id="echoid-s2306" xml:space="preserve">
              <pb o="105" file="0181" n="210" rhead="PERSPECTIVE."/>
            more conveniently go in at the Door in the Side
              <lb/>
            of the Machine.</s>
            <s xml:id="echoid-s2307" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2308" xml:space="preserve">6. </s>
            <s xml:id="echoid-s2309" xml:space="preserve">There are two Tin-Tubes bent at each End,
              <lb/>
            (one of which is repreſented in Fig. </s>
            <s xml:id="echoid-s2310" xml:space="preserve">76. </s>
            <s xml:id="echoid-s2311" xml:space="preserve">becauſe
              <lb/>
            they could not be ſhewn in the Figure of the
              <lb/>
            Machine) placed in the Furniture, near the
              <lb/>
            Back-ſide of the Machine, each having one End
              <lb/>
            without the Machine. </s>
            <s xml:id="echoid-s2312" xml:space="preserve">Theſe Tubes ſerve to give
              <lb/>
            Air to Perſons ſhut up in the Machine, yet ſo,
              <lb/>
            that no Light may enter through them.</s>
            <s xml:id="echoid-s2313" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2314" xml:space="preserve">7. </s>
            <s xml:id="echoid-s2315" xml:space="preserve">At the Places c, c, c, c, on the Out-ſide of
              <lb/>
            the Back-part of the Machine, are four Iron-Sta-
              <lb/>
            ples, in which ſlide two Wooden Rulers D E, D E,
              <lb/>
            about 3 Inches broad, having two other thin
              <lb/>
            Rulers going through holes made at their Tops, at
              <lb/>
            the Places D, D, to which thin Rulers the Board
              <lb/>
            F is fixed; </s>
            <s xml:id="echoid-s2316" xml:space="preserve">and ſo by this Means the ſaid Board
              <lb/>
            may be vertically moved backwards or for-
              <lb/>
            wards.</s>
            <s xml:id="echoid-s2317" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2318" xml:space="preserve">8. </s>
            <s xml:id="echoid-s2319" xml:space="preserve">On the Top of the Machine, there is a
              <lb/>
            Board about 15 Inches long, and 9 Inches broad,
              <lb/>
            having an hole PMOQ quite through it, about
              <lb/>
            9 or 10 Inches long, and four Inches broad.</s>
            <s xml:id="echoid-s2320" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2321" xml:space="preserve">9. </s>
            <s xml:id="echoid-s2322" xml:space="preserve">Upon the aforeſaid Board are fix’d two Dove-
              <lb/>
            tail’d Rulers, between which another Board ſlides
              <lb/>
            of the ſame Length as that, and whoſe breadth is
              <lb/>
            about 6 Inches. </s>
            <s xml:id="echoid-s2323" xml:space="preserve">In the middle of this ſecond
              <lb/>
            Board is a round Hole about three Inches Diame-
              <lb/>
            ter, hollowed into a female Screw, in which is
              <lb/>
            fitted a Cylinder about four Inches long, which
              <lb/>
            carries the Convex Glaſs; </s>
            <s xml:id="echoid-s2324" xml:space="preserve">Of which more here-
              <lb/>
            after.</s>
            <s xml:id="echoid-s2325" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2326" xml:space="preserve">10 The Figure X is a ſquare Box about 7 or
              <lb/>
            8 Inches broad, and 10 in height, which ſlides
              <lb/>
            upon the plain Board mentioned in Numb. </s>
            <s xml:id="echoid-s2327" xml:space="preserve">8. </s>
            <s xml:id="echoid-s2328" xml:space="preserve">the
              <lb/>
            Side B ſerving as a Door, is next to the fore-ſide
              <lb/>
            of the Machine, as it appears in the Figure; </s>
            <s xml:id="echoid-s2329" xml:space="preserve"/>
          </p>
        </div>
      </text>
    </echo>
Impressum