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="013/01/140.jpg" pagenum="110"/>
              the Tube totally to ſubſide; becauſe,
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              when the Receiver was conſiderably em­
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              pty'd of its Air, and conſequently that
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              little that remain'd grown unable to reſiſt
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              the Irruption of the external, that Air
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              would (in ſpight of whatever we could
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              do) preſs in at ſome little Avenue or
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              other; and though much could not there­
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              at get in, yet a little was ſufficient to coun­
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              terballance the preſſure of ſo ſmall a Cy­
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              linder of Quick-ſilver, as then remain'd
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              in the Tube. </s>
            </p>
            <p type="main">
              <s>Now (to ſatisfie our ſelves further, that
                <lb/>
              the failing of the Quick-ſilver in the
                <lb/>
              Tube to a determinate height, proceeds
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              from the
                <emph type="italics"/>
              Æquilibrium,
                <emph.end type="italics"/>
              wherein it is at
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              that height with the external Air, the one
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              gravitating, the other preſſing with equal
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              force upon the ſubjacent Mercury) we Re­
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              turned the Key and let in ſome new Air;
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              upon which the Mercury immediatly be­
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              gan to aſcend (or rather to be impell'd up­
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              wards) in the Tube, and continu'd aſcend­
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              ing, till having Return'd the Key it im­
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              mediatly reſted at the height which it had
                <lb/>
              then attain'd: And ſo, by Turning and
                <lb/>
              Returning the Key, we did ſeveral times
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              at pleaſure impel it upwards, and check its
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              aſcent. </s>
              <s>And laſtly, having given a free </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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