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

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="013/01/165.jpg" pagenum="135"/>
              ambient Air are in an
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              Æquilibrium
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              as to
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              preſſure, and the weight of the Water
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              that keeps them ſeparate is ſcarce conſi­
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              derable. </s>
              <s>Whereas in ſuch a Tube as we
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              are ſpeaking of, the Air within is very
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              much more dilated then that without; and
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              'tis not ſo much the ſpring or reſiſtance
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              of the included Air, as the weight of the
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              Mercurial Cylinder it ſelf that hinders the
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              Quick-ſilver from aſcending higher; for
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              if we ſhould ſuppoſe that deſerted part of
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              the Tube perfectly devoid of Air, yet
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              would the Quick-ſilver riſe but a little
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              higher in it, and be far from filling it, in
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              regard the outward Air would not be
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              able to impel up ſuch a weight much
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              higher: whereas it may, by our former
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              Experiments appear, that if all the Air in
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              the upper part of a Weather-Glaſs were
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              away, the Water would be impell'd up to
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              the very top of it, though the Pipe were
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              above thirty Foot long. </s>
            </p>
            <p type="main">
              <s>We may next conſider, that this ra­
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              rified Air at the upper part of our Tube
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              being exactly ſhut up betwixt the Glaſs
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              and the Quick-ſilver, it was ſcarce ſubject
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              to any diſcernable alterations, ſave thoſe
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              it receiv'd from heat and cold. </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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