Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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          <chap>
            <p type="main">
              <s>
                <pb xlink:href="040/01/372.jpg" pagenum="352"/>
                <arrow.to.target n="marg672"/>
                <lb/>
              ſheweth his diſtruſt of a Spherical Inſtrument compoſed by
                <emph type="italics"/>
                <lb/>
              chimedes
                <emph.end type="italics"/>
              hiſmelf to take the Suns ingreſſion into the
                <lb/>
                <lb/>
                <arrow.to.target n="marg673"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg668"/>
                <emph type="italics"/>
              If in the fixed
                <lb/>
              ſtars one ſhould
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              diſcover any
                <lb/>
              nual mutation, the
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              motion of the
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              Earth would be
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              undeniable.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg669"/>
                <emph type="italics"/>
              It is proved what
                <lb/>
              ſmall credit is to be
                <lb/>
              given to
                <lb/>
              mical Inſtruments
                <lb/>
              in minute
                <lb/>
              tions.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg670"/>
              * Braceia Italian.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg671"/>
              * Or Mill.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg672"/>
              Ptolomy
                <emph type="italics"/>
              did not
                <lb/>
              truſt to an
                <lb/>
              ment made by
                <emph.end type="italics"/>
                <lb/>
              chimedes.</s>
            </p>
            <p type="margin">
              <s>
                <margin.target id="marg673"/>
                <emph type="italics"/>
              Inſtruments of
                <emph.end type="italics"/>
                <lb/>
              Tycho
                <emph type="italics"/>
              made with
                <lb/>
              great expence.
                <emph.end type="italics"/>
              </s>
            </p>
            <p type="main">
              <s>SIMP. </s>
              <s>But if the Inſtruments be ſo ſuſpitious, and the
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              vations ſo dubious, how can we ever come to any certainty of
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              things, or free our ſelves from miſtakes? </s>
              <s>I have heard ſtrange
                <lb/>
              things of the Inſtruments of
                <emph type="italics"/>
              Tycho
                <emph.end type="italics"/>
              made with extraordinary coſt,
                <lb/>
              and of his ſingular diligence in obſervations.</s>
            </p>
            <p type="main">
              <s>SALV. </s>
              <s>All this I grant you; but neither one nor other of
                <lb/>
              theſe is ſufficient to aſcertain us in a buſineſſe of this importance. </s>
            </p>
            <p type="main">
              <s>
                <arrow.to.target n="marg674"/>
                <lb/>
              I deſire that we may make uſe of Inſtruments greater by far, and
                <lb/>
              by far certainer than thoſe of
                <emph type="italics"/>
              Tycho,
                <emph.end type="italics"/>
              made with a very ſmall
                <lb/>
              charge; the ſides of which are of 4. 6. 20. 30. and 50. miles, ſo
                <lb/>
                <arrow.to.target n="marg675"/>
                <lb/>
              as that a degree is a mile broad, a minute prim. </s>
              <s>50 ^{*} yards, a
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              ſecond but little leſſe than a yard, and in ſhort we may without
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              a farthing expence procure them of what bigneſſe we pleaſe. </s>
              <s>I
                <lb/>
                <arrow.to.target n="marg676"/>
                <lb/>
              being in a Countrey Seat of mine near to
                <emph type="italics"/>
              Florence,
                <emph.end type="italics"/>
              did plainly
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              obſerve the Suns arrival at, and departure from the Summer
                <lb/>
              Solſtice, whilſt one Evening at the time of its going down it
                <lb/>
              peared upon the top of a Rock on the Mountains of
                <emph type="italics"/>
              Pictrapana,
                <emph.end type="italics"/>
                <lb/>
              about 60. miles from thence, leaving diſcovered of it a ſmall
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              ſtreak or filament towards the North, whoſe breadth was not
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              the hundredth part of its Diameter; and the following Evening
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              at the like ſetting, it ſhew'd ſuch another part of it, but notably
                <lb/>
              more ſmall, a neceſſary argument, that it had begun to recede
                <lb/>
              from the Tropick; and the regreſſion of the Sun from the firſt to
                <lb/>
              the ſecond obſervation, doth not import doubtleſſe a ſecond
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                <arrow.to.target n="marg677"/>
                <lb/>
              nute in the Eaſt. </s>
              <s>The obſervation made afterwards with an
                <lb/>
              quiſite Teleſcope, and that multiplyeth the
                <emph type="italics"/>
              Diſcus
                <emph.end type="italics"/>
              of the Sun
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              more than a thouſand times, would prove eaſie, and with all
                <lb/>
              delightful. </s>
              <s>Now with ſuch an Inſtrument as this, I would have
                <lb/>
              obſervations to be made in the fixed ſtars, making uſe of ſome
                <lb/>
              of thoſe wherein the mutation ought to appear more
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              ous, ſuch as are (as hath already been declared) the more
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              mote from the Ecliptick, amongſt which the Harp a very great
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              ſtar, and near to the Pole of the Ecliptick, would be very
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              per in Countries far North, proceeding according to the
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              ner that I ſhall ſhew by and by, but in the uſe of another ſtar;
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              and I have already fancied to my ſelf a place very well adapted
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              for ſuch an obſervation. </s>
              <s>The place is an open Plane, upon
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              which towards the North there riſeth a very eminent Mountain,
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              in the apex or top whereof is built a little Chappel, ſituate Eaſt
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              and Weſt, ſo as that the ridg of its Roof may interſect at right
                <lb/>
              angles, the meridian of ſome building ſtanding in the Plane. </s>
              <s>I
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              will place a beam parallel to the ſaid ridg, or top of the Roof, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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