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