Harriot, Thomas, Mss. 6789

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          <pb file="0371.jpg" o="186r" n="371"/>
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            <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>
              . On this sheet, Harriot considers his third and fourth guesses for the secondary cardinal (made on
                <ref target="http://echo.mpiwg-berlin.mpg.de/ECHOdocuView?url=%2Fmpiwg%2Fonline%2Fpermanent%2Flibrary%2F0VGM2B80&start=390&viewMode=image&pn=373"> f. 187</ref>
              , 'E') in the glass prism; his calculations show that the 'good cardinal' should be chosen at a point equidistant between the two. </s>
              <s xml:space="preserve">]</s>
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          <head xml:space="preserve">F</head>
          <p xml:lang="lat">
            <s xml:space="preserve"> In triangulo bde. per 4 cardinalem.
              <lb/>
            [
              <emph style="bf">Translation: </emph>
            In triangle
              <math>
                <mstyle>
                  <mi>b</mi>
                  <mi>d</mi>
                  <mi>e</mi>
                </mstyle>
              </math>
            , by means of the fourth cardinal. ]
              <lb/>
            </s>
            <s xml:space="preserve"> In triangulo bde per 3 cardinalem.
              <lb/>
            [
              <emph style="bf">Translation: </emph>
            In triangle
              <math>
                <mstyle>
                  <mi>b</mi>
                  <mi>d</mi>
                  <mi>e</mi>
                </mstyle>
              </math>
            , by means of the third cardinal. ] </s>
          </p>
          <p xml:lang="lat">
            <s xml:space="preserve"> 4
              <emph style="super">tus</emph>
            cardinalis 39° 41′ deficit
              <lb/>
            3
              <emph style="super">us</emph>
            cardinalis 39° 42′ excedit.
              <lb/>
            Ergo bonus cardinalis 39° 41′ 30″ υ 6386559.
              <lb/>
            [
              <emph style="bf">Translation: </emph>
            The fourth cardinal 39° 41′ falls short.
              <lb/>
            The third cardinal 39° 42′ goes too far.
              <lb/>
            And so the good cardinal is 39° 41′ 30″, the sine of which is 6386559. ] </s>
          </p>
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