Harriot, Thomas, Mss. 6789

List of thumbnails

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851
851 (426r) 		852
852 (426v)
853
853 (427r) 		854
854 (427v)
855
855 (428r) 		856
856 (428v)
857
857 (429r) 		858
858 (429v)
859
859 (430r) 		860
860 (430v)
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page |< < (534r) of 1074 > >|
    <echo version="1.0RC">
      <text xml:lang="eng" type="free">
        <div type="section" level="1" n="1">
          <pb file="1065.jpg" o="534r" n="1065"/>
          <head xml:space="preserve"> 1.
            <lb/>
          Of the manner to observe the variation of
            <lb/>
          compasse, or of the wires of the same, by the sonnes
            <lb/>
          rising or </head>
          <p>
            <s xml:space="preserve"> There are two sortes of compasse ordayned for
              <emph style="st">the the observatio</emph>
              <emph style="super">observing the variation</emph>
            of the
              <lb/>
            wires; one hath a moveable
              <emph style="st">fy</emph>
            fly; the other hath none. The
              <foreign xml:lang="fre">flour de</foreign>
              <lb/>
              <foreign xml:lang="fre">lure</foreign>
            or north poynt of the fly standeth directly with the
              <emph style="st">fly</emph>
            wires in both.
              <lb/>
            And the utmost circle of both is devided in to poynts & degrees; there being
              <lb/>
            11 degrees & a quarter betwixt poynte &
              <emph style="super">This being rememebred of your compasses.</emph>
            Then for your observat-
              <lb/>
            on you are to do
              <emph style="st">the l</emph>
            as </s>
          </p>
          <p>
            <s xml:space="preserve"> In
              <emph style="super">the</emph>
            morning or eveninge when you may see the sonne rise or set
              <lb/>
            (your compasse standing fit;) you are to marke
              <emph style="st">upon what</emph>
              <lb/>
              <emph style="super">how many</emph>
            degrees
              <lb/>
            the sonne riseth from the East poynt of the
              <emph style="st">comp</emph>
            fly; or setteth from
              <lb/>
            the west, & note whether to the southwardes or northwards; this observation
              <lb/>
            & as many as you can make enter into your booke; noting the day & place
              <lb/>
              <emph style="st">that</emph>
              <emph style="super">where</emph>
            you made </s>
          </p>
          <p>
            <s xml:space="preserve"> Then for the finding of the variation, I have calculated a speciall
              <lb/>
            table for the purpose; whose title is A table for the sonne rising
              <lb/>
            & setting from the true East & West. which you are to use in
              <lb/>
            this manner. first consider what declination the sonne hath
              <lb/>
            that present day which you
              <emph style="super">may</emph>
            know by your Regiment; Also what
              <lb/>
            is the elevation of the pole at that plane, which you are to know upon
              <lb/>
            reckoning from your last </s>
          </p>
          <p>
            <s xml:space="preserve"> Then in the sayd table of thes onnes rising & setting loke in the
              <lb/>
            head of the table the degrees of the sonnes declination; & on
              <emph style="super">left</emph>
              <emph style="st">right</emph>
              <lb/>
            side
              <emph style="st">or left of the table</emph>
            loke the Degree of elevation & right agaynst the
              <lb/>
            same under the declination you efore noted; (in the common angle)
              <lb/>
            you shall find how much the sonne riseth or setteth from the true east
              <lb/>
            or west in degrees & minuts. rising is always to the northward
              <lb/>
            if the sonne hath north declination, or southward if the declination
              <lb/>
            be south. And this nomber of degrees & minuts for brevity
              <emph style="super">& distinction</emph>
              <lb/>
            sake hereafter to be used is called the sonnes </s>
          </p>
          <p>
            <s xml:space="preserve"> Now to conclude how much
              <emph style="st">your</emph>
            your compasse doth vary the breefest
              <lb/>
            & most intelligible way is this: note upon the same fly you made
              <lb/>
            your observation by, or upon any other in any booke that hath degrees
              <lb/>
            in the utmost circle, the degree that the prime rose be set upon: Then
              <lb/>
            from that marke
              <emph style="st">towards the East</emph>
            reckon or nomber the degrees of the
              <lb/>
            sonnes Amplitude northward if the sonne hath south declination; or reckon
              <lb/>
            southward if the sonne hath north declination & where the degrees end there
              <lb/>
            is the true east or west; which being had,
              <emph style="st">it self</emph>
            it is then manifest
              <lb/>
            both how much your compasse doth vary & which </s>
          </p>
        </div>
      </text>
    </echo>
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