Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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formér floating poſture: And this Expe
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riment taught us, among other things,
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that it was a work of more time and la
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bor then we imagin'd, to exhauſt our En
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gine as much as it may be exhauſted: for
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although before the emerging of the ſmall
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Viol, we did (as has been touch'd alrea
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dy) think we had very conſiderably em
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ptyed the Receiver, becauſe there ſeem'd
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to come out but very little or almoſt
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no ſenſible Air at each exſuction into
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and out of the Cylinder; yet after
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wards, at each drawing down the Suc
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ker, the Air included in the Viol did
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manifeſtly dilate it ſelf, ſo long, that
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it did no leſs then nine times turn its
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mouth upwards, and diſcharge a bub
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ble by conjecture about the bigneſs of
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a Pea, after the manner newly recited.
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>But as for that Violl which had the
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weight in it, it roſe not at all. </
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>So
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that being not able by quick pumping
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to gain another bubble from the Air
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in the ſwimming Glaſs, which proceed
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ed from ſome ſmall leak in the Veſſel,
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though it held in this Experiment more
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ſtanch then was uſual, we thought fit
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to let in leaſurely the Air from with
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out, upon whoſe admiſſion that with-</
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