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="013/01/239.jpg" pagenum="209"/>
              is no intercourſe betwixt the external and
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              internal Air, can be heard by thoſe with­
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              out, unleſs the ſounding Body do imme­
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              diately ſtrike againſt ſome part of the in­
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              cloſing Body. </s>
              <s>But not having now time
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              to handle Controverſies, we ſhall onely
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              annex, That after the foregoing Experi­
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              ment, we took a Bell of about two Inches
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              in Diameter at the bottom, which was
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              ſupported in the midſt of the cavity of
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              the Receiver by a bent ſtick, which by
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              reaſon of its Spring preſſ'd with its two
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              ends againſt the oppoſite parts of the in­
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              ſide of the Veſſel: in which, when it was
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              cloſ'd up, we obſerv'd that the Bell ſeem'd
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              to ſound more dead then it did when juſt
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              before it ſounded in the open Air. </s>
              <s>And
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              yet, when afterwards we had as formerly
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              emptyed the Receiver, we could not diſ­
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              cern any conſiderable change (for ſome
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              ſaid they obſerv'd a ſmall one) in the loud­
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              neſs of the ſound, whereby it ſeem'd that
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              though the Air be the principal medium
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              of ſound, yet either a more ſubtle mat­
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              ter may be alſo a medium of it, or elſe an
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              ambient Body that contains but very
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              few particles of Air, in compariſon of
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              thoſe it is eaſily capable of, is ſufficient
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              for that purpoſe. </s>
              <s>And this, among o-</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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