Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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come directly in a ſtraight Line from the
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Watch unto the Ear. </
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<
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>And it was obſerva
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ble to this purpoſe, that we found a mani
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feſt diſparity of noiſe, by holding our Ears
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near the ſides of the Receiver, and near the
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Cover of it: which difference ſeem'd to
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proceed from that of the Texture of the
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Glaſs, from the ſtructure of the cover (and
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of the Cement) through which the ſound
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was propagated from the Watch to the
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Ear. </
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<
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>But let us proſecute our Experiment.
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<
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>The Pump after this being imployd, it
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ſeemd that from time to time the ſound
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grew fainter and fainter; ſo that when the
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Rec iver was empty'd as much as it uſ'd
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to be for the foregoing Experiments, nei
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ther we, nor ſome ſtrangers that chanc'd
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to be then in the room, could, by applying
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our Ears to the very ſides, hear any noiſe
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from within; though we could eaſily per
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ceive that by the moving of the hand
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which mark'd the ſecond minutes, and by
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that of the ballance, that the Watch nei
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ther ſtood ſtil, nor remarkably varied from
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its wonted motion. </
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>And to ſatisfie our
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ſelvs further that it was indeed the abſence
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of the Air about the Watch that hinder'd
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us from hearing it, we let in the external
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Air at the Stop-cock, and then though we </
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