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

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb xlink:href="013/01/087.jpg" pagenum="47"/>
            <p type="main">
              <s>This Experiment is much of the ſame
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              nature with that which was ſome years
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              agoe ſaid to be made by that eminent Ge­
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              ometrician Monſieur
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              Roberval,
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              with a
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              Carps Bladder empty'd and convey'd into
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              a Tube, wherein the Experiment
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              De Va­
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              cuo
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              was afterwards try'd, which ingeni­
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              ous Experiment of his juſtly deſerves the
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              thanks of thoſe that have been, or ſhall be
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              ſolicitous to diſcover the nature of the
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              Air. </s>
            </p>
            <p type="main">
              <s>But to return to our Experiment, we
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              may take notice of this Circumſtance in
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              it, That after the Receiver has been in
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              ſome meaſure empty'd, the Bladder do's,
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              at each exſuction, ſwell much more con­
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              ſpicuouſly then it did at any of the firſt
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              Exſuctions; inſomuch that towards the
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              end of the pumping, not onely a great
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              fold or cavity in the ſurface of the Blad­
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              der may be made, even by the ſtretching
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              of the inward ſelf-expanding Air: But
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              we have ſometimes ſeen, upon the turn­
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              ing of the Key to let the ambient Air
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              paſs out of the Receiver into the Cylin­
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              der, we have ſeen (I ſay) the Air in the
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              Bladder ſuddenly expand it ſelf ſo much
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              and ſo briskly, that it manifeſtly lifted up
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              ſome light Bodies that lean'd upon it, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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