Harriot, Thomas, Mss. 6789

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page |< < (190r) of 1074 > >|
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      <text xml:lang="eng" type="free">
        <div type="section" level="1" n="1">
          <pb file="0379.jpg" o="190r" n="379"/>
          <div type="page_commentary" level="0" n="0">
            <p>
              <s xml:space="preserve">[
                <emph style="bf">Commentary:</emph>
              </s>
            </p>
            <p>
              <s xml:space="preserve"> This page is part of Harriot's
                <ref target="http://echo.mpiwg-berlin.mpg.de/content/scientific_revolution/harriot/maps/9.2.3_colour.pt"> experiments on refractive colours</ref>
              . A summary of experimental apparatus and the raw observational data that Harriot obtained over four days in April, 1605, observing the coloured fringes on a card viewed through a glass triangular prism and a water-filled triangular prism. In the subsequent pages (now very disordered in the manuscript volume), Harriot will use the data recorded here to obtain a range of 'cardinal rays' for the two substances; or, in effect, a range of refractive indices responsible for the production of the spectrum of colours. </s>
              <s xml:space="preserve">]</s>
            </p>
          </div>
          <head xml:space="preserve"> observations of colours. Aprill 8.
            <emph style="super">9. 10. 11.</emph>
          </head>
          <head xml:space="preserve" xml:lang="lat"> bis observata: id est duobus diversis diebus.
            <emph style="super">tribus. 4
              <emph style="super">or</emph>
            .</emph>
            <lb/>
          [
            <emph style="bf">Translation: </emph>
          Observed twice. That is, on two (three, four) separate days. ] </head>
          <p xml:lang="lat">
            <s xml:space="preserve">Angulus vitreus: 58° 0′
              <lb/>
            Angulus incidentiæ: 51° 0′. distantia puncti ab angulo:
              <math>
                <mstyle>
                  <mfrac>
                    <mrow>
                      <mn>1</mn>
                      <mn>1</mn>
                    </mrow>
                    <mrow>
                      <mn>1</mn>
                      <mn>8</mn>
                    </mrow>
                  </mfrac>
                </mstyle>
              </math>
              <foreign xml:lang="eng">inch</foreign>
            .
              <lb/>
            Superficiei
              <emph style="super">vitri</emph>
              <emph style="st">oculo proximae</emph>
            distantia a charta — 6
              <foreign xml:lang="eng">feete </foreign>
            — 12
              <foreign xml:lang="eng">feete</foreign>
              <lb/>
            flavedo a termino chartae — 1
              <math>
                <mstyle>
                  <mfrac>
                    <mrow>
                      <mn>1</mn>
                    </mrow>
                    <mrow>
                      <mn>2</mn>
                      <mn>5</mn>
                    </mrow>
                  </mfrac>
                </mstyle>
              </math>
              <foreign xml:lang="eng">ynches</foreign>
            — 2
              <foreign xml:lang="eng">inches</foreign>
              <lb/>
            rubedo a termino chartae —
              <math>
                <mstyle>
                  <mfrac>
                    <mrow>
                      <mn>1</mn>
                    </mrow>
                    <mrow>
                      <mn>2</mn>
                    </mrow>
                  </mfrac>
                </mstyle>
              </math>
              <foreign xml:lang="eng">ynch</foreign>
            — 1
              <foreign xml:lang="eng">inch</foreign>
            .
              <lb/>
            quasi. Termini non ita perfecte percipiuntur.
              <lb/>
            centrum perfectis fuit in perpendiculari ad chartam.
              <lb/>
            oculus a vitro 8
              <foreign xml:lang="eng">ynches</foreign>
            .
              <lb/>
            [
              <emph style="bf">Translation: </emph>
            Angle of the glass:
              <lb/>
            Angle of incidence:
              <lb/>
            distance of point from the apex
              <lb/>
            Distance
              <emph style="st">closest to the eye</emph>
            of the surface of the glass to the card:
              <lb/>
            Yellow, from the edge of the card:
              <lb/>
            Red, from the edge of the card:
              <lb/>
            Approximately. The edges were not so clearly perceived.
              <lb/>
            The centre was perfectly in the perpendicular to the card.
              <lb/>
            Eye from glass ] </s>
          </p>
          <p>
            <s xml:space="preserve"> I observed with the angle
              <lb/>
            of 60° of glasse, &
              <foreign xml:lang="lat">sal gemmæ</foreign>
              <lb/>
            & found them all one. </s>
          </p>
          <p xml:lang="lat">
            <s xml:space="preserve"> Angulus aqueus: 60° 0′
              <lb/>
            Angulus incidentiæ: 43°
              <lb/>
            Distantia: 6
              <foreign xml:lang="eng">feete</foreign>
              <lb/>
            flavedo a termino chartæ:
              <math>
                <mstyle>
                  <mfrac>
                    <mrow>
                      <mn>3</mn>
                    </mrow>
                    <mrow>
                      <mn>5</mn>
                    </mrow>
                  </mfrac>
                </mstyle>
              </math>
              <foreign xml:lang="eng">ynches</foreign>
              <lb/>
            rubedo a termino chartæ:
              <math>
                <mstyle>
                  <mfrac>
                    <mrow>
                      <mn>3</mn>
                    </mrow>
                    <mrow>
                      <mn>1</mn>
                      <mn>0</mn>
                    </mrow>
                  </mfrac>
                </mstyle>
              </math>
              <foreign xml:lang="eng">ynches</foreign>
              <lb/>
            [
              <emph style="bf">Translation: </emph>
            Angle of water:
              <lb/>
            Angle of incidence:
              <lb/>
            Distance:
              <lb/>
            Yellow from edge of card:
              <lb/>
            Red from edge of card:
              <lb/>
            ] </s>
          </p>
          <head xml:space="preserve"> Of the same
            <foreign xml:lang="lat">prisma</foreign>
          of glasse with angles and distances as below. </head>
          <p>
            <s xml:space="preserve"> At the angle of incidence 27° 0′
              <lb/>
            this
              <foreign xml:lang="lat">prisma</foreign>
            I found
              <lb/>
            had not three angles
              <lb/>
            equall to two right angles,
              <lb/>
            wanting 1° 30′, & the sides not
              <lb/>
            playne. It was found not pira-
              <lb/>
            midall. The observations
              <lb/>
            therefore not to be trusted. </s>
          </p>
          <p>
            <s xml:space="preserve"> The red is as big
              <emph style="st">upon the</emph>
            or as large
              <lb/>
            from the end of the
              <foreign xml:lang="lat">charta</foreign>
            as the yellow
              <lb/>
            before. That is 1
              <math>
                <mstyle>
                  <mfrac>
                    <mrow>
                      <mn>1</mn>
                    </mrow>
                    <mrow>
                      <mn>2</mn>
                      <mn>5</mn>
                    </mrow>
                  </mfrac>
                </mstyle>
              </math>
            ynches </s>
          </p>
          <p>
            <s xml:space="preserve"> The yellow as large agayne, that is 2
              <math>
                <mstyle>
                  <mfrac>
                    <mrow>
                      <mn>2</mn>
                    </mrow>
                    <mrow>
                      <mn>2</mn>
                      <mn>5</mn>
                    </mrow>
                  </mfrac>
                </mstyle>
              </math>
            ynches,
              <lb/>
            and the image of the
              <foreign xml:lang="lat">charta </foreign>
            in appearance of much
              <lb/>
            less angle then
              <foreign xml:lang="lat">in [¿]reali[?]</foreign>
            , more then half.</s>
          </p>
          <p>
            <s xml:space="preserve"> At the angle of incidence of 67° 0′: The yellow from the ende is
              <math>
                <mstyle>
                  <mfrac>
                    <mrow>
                      <mn>1</mn>
                      <mn>7</mn>
                    </mrow>
                    <mrow>
                      <mn>2</mn>
                      <mn>0</mn>
                    </mrow>
                  </mfrac>
                </mstyle>
              </math>
            ynch or there aboute.
              <lb/>
            The red aboute half that or a litle </s>
          </p>
          <p>
            <s xml:space="preserve"> The
              <foreign xml:lang="lat">imago</foreign>
            & by coniecture double the </s>
          </p>
        </div>
      </text>
    </echo>
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