Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

Table of figures

< >
< >
page |< < of 862 > >|
    <archimedes>
      <text>
        <body>
          <chap>
            <pb xlink:href="013/01/164.jpg" pagenum="134"/>
            <p type="main">
              <s>If Your Lordſhip ſhould now ask me
                <lb/>
              what are the true cauſes of this varying al­
                <lb/>
              titude of the Mercurial Cylinder; I ſhould
                <lb/>
              not undertake to anſwer ſo difficult a que­
                <lb/>
              ſtion, and ſhould venter to ſay no more,
                <lb/>
              then that among divers poſſible cauſes to
                <lb/>
              which it may be aſcribed, it would not be,
                <lb/>
              perhaps, abſurd to reckon theſe that fol­
                <lb/>
              low. </s>
            </p>
            <p type="main">
              <s>Firſt then we may conſider, that the Air
                <lb/>
              in the upper part of the Tube is much
                <lb/>
              more rarified, and therefore more weak
                <lb/>
              then the external Air, as may appear by
                <lb/>
              this among other things, That upon the in­
                <lb/>
              clining of the Tube the Quick-ſilver will
                <lb/>
              readily aſcend almoſt to the very top of
                <lb/>
              it, and ſo take up eight or nine tenth parts,
                <lb/>
              and perhaps more of that ſpace which it
                <lb/>
              deſerted before: which would not happen
                <lb/>
              if that whole ſpace had been full of unra­
                <lb/>
              rified Air, ſince that (as tryal may eaſily
                <lb/>
              ſatisfie you) would not have ſuffer'd it
                <lb/>
              ſelf to be thruſt into ſo narrow a room by
                <lb/>
              ſo weak a preſſure. </s>
              <s>So that although in
                <lb/>
              our Tube when the included Air was
                <lb/>
              heated, the Quick-ſilver was ſomewhat
                <lb/>
              depreſſ'd: Yet there is this difference be­
                <lb/>
              twixt ſuch a Tube and common Weather­
                <lb/>
              Glaſſes, that in theſe the included and the </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
Impressum