Harriot, Thomas, Mss. 6788

List of thumbnails

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841
841 (421r) 		842
842 (421v)
843
843 (422r) 		844
844 (422v)
845
845 (423r) 		846
846 (423v)
847
847 (424r) 		848
848 (424v)
849
849 (425r) 		850
850 (425v)
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page |< < (488r) of 1134 > >|
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          <pb file="0975.jpg" o="488r" n="975"/>
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          <p>
            <s xml:space="preserve"> Hight of the
              <lb/>
            ey above the
              <lb/>
            water in
              <lb/>
            </s>
          </p>
          <p>
            <s xml:space="preserve"> Surplus of
              <lb/>
            the Horizon
              <lb/>
            in </s>
          </p>
          <p>
            <s xml:space="preserve"> those thinges being regarded which I have specifyed concerning
              <lb/>
            the staffe: you may henceforward make as true observations as need to
              <lb/>
            be: the starre or sonne being of any
              <emph style="st">Which before</emph>
              <emph style="super">Heretofore</emph>
              <emph style="st">seamaster</emph>
              <lb/>
              <emph style="st">ship</emph>
            seamaster durst not to trust to the altitude of the sonne or starre
              <lb/>
            being 60 degrees & upward. because of the difference from the Astrolabe,
              <lb/>
            imputing the error to the uncertenty in beholding; when as in deed they
              <lb/>
            know not the abatement I before spake of. the parallaxis & surplus
              <lb/>
            & that is the cause
              <emph style="super">also</emph>
            of there experimental opening of
              <emph style="super">the</emph>
            Horizon.
              <lb/>
            And although the error about 30
              <emph style="super">in stars of ordinary [???] be</emph>
              <emph style="st">be but [???] as al</emph>
            no great
              <lb/>
            matter of some
              <math>
                <mstyle>
                  <mn>1</mn>
                  <mn>0</mn>
                  <mo>"</mo>
                </mstyle>
              </math>
            or there aboute, yet in the hight of 60 & upward it
              <lb/>
            amounteth to
              <emph style="ul">nere a degree, & more</emph>
            . In starres of the largest size
              <lb/>
            the error was the lesse; but now by reason of the former correction, the
              <lb/>
            longer & shorter sorte will </s>
          </p>
          <p>
            <s xml:space="preserve"> ffor taking the sonnes high also by the staffe I thinke good also to
              <lb/>
            prescribe uncertenty, & to remember unto you the meanes for it
              <lb/>
            may be done without offense to the </s>
          </p>
          <p>
            <s xml:space="preserve"> Those men that set a glasse at the end of there staffe or end of the crosse
              <lb/>
            do
              <emph style="st">[???]</emph>
              <emph style="super">subiect them selves to</emph>
            error. It is manifest without any further reason by a common
              <lb/>
            experiment of looking thorugh glasse windows, that the thinges seene
              <lb/>
            thourough, are seen distorted,
              <emph style="super">or</emph>
            out of there
              <emph style="super">true</emph>
            places, by reason of refraction
              <lb/>
            of the visuall beames in the
              <emph style="st">[???]</emph>
            arte of optickes demonstratively appro-
              <lb/>
            ved. Therefore such meanes I wish to be </s>
          </p>
          <p>
            <s xml:space="preserve"> The best way that I can præscribe, which some do also use, is to take the high of
              <lb/>
            the upper edge of the sonne, hiding the whole body with the breadth of the crosse:
              <lb/>
            And when you have don, to abate 16 minuts; because the diameter or breadth
              <lb/>
            of the
              <emph style="st">sonne</emph>
            sonne is
              <math>
                <mstyle>
                  <mn>3</mn>
                  <mn>2</mn>
                  <mo>"</mo>
                </mstyle>
              </math>
            . and then you have the hight of the center of the
              <lb/>
            sonne which you ought to </s>
          </p>
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Impressum