Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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rous, that could well be made without
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ſome ſuch Engine as ours) ſome things
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might be ſpeciouſly enough alleadg'd; we
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thought fit to make a tryal or two, in or
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der to the Diſcovery of what the Air does
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in conveying of ſounds, reſerving divers
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other Experiments tryable in our Engine
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concerning ſounds, till we can obtain more
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leaſure to proſecute them. </
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>Conceiving it
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then the beſt way to make our tryal with
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ſuch a noiſe as might not be loud enough
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to make it difficult to diſcern ſlighter va
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riations in it, but rather might be, both
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laſting, that we might take notice by what
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degrees it decreaſ'd; and ſo ſmall, that
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it could not grow much weaker with
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out becoming imperceptible. </
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>We took
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a Watch, whoſe Caſe we open'd, that
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the contain'd Air might have free egreſs
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into that of the Receiver. </
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>And this Watch
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was ſuſpended in the cavity of the Veſſel
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onely by a Pack-thred, as the unlikelieſt
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thing to convey a ſound to the top of the
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Receiver: And then cloſing up the Veſ
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ſel with melted Plaiſter, we liſten'd near
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the ſides of it, and plainly enough heard
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the noiſe made by the ballance. </
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<
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>Thoſe al
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ſo of us, that watch'd for that Circum
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ſtance, obſerv'd, that the noiſe ſeem'd to </
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