Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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47
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<
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>This Experiment is much of the ſame
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nature with that which was ſome years
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agoe ſaid to be made by that eminent Ge
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ometrician Monſieur
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Roberval,
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with a
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Carps Bladder empty'd and convey'd into
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a Tube, wherein the Experiment
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De Va
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cuo
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was afterwards try'd, which ingeni
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ous Experiment of his juſtly deſerves the
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thanks of thoſe that have been, or ſhall be
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ſolicitous to diſcover the nature of the
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Air. </
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<
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>But to return to our Experiment, we
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may take notice of this Circumſtance in
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it, That after the Receiver has been in
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ſome meaſure empty'd, the Bladder do's,
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at each exſuction, ſwell much more con
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ſpicuouſly then it did at any of the firſt
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Exſuctions; inſomuch that towards the
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end of the pumping, not onely a great
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fold or cavity in the ſurface of the Blad
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der may be made, even by the ſtretching
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of the inward ſelf-expanding Air: But
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we have ſometimes ſeen, upon the turn
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ing of the Key to let the ambient Air
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paſs out of the Receiver into the Cylin
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der, we have ſeen (I ſay) the Air in the
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Bladder ſuddenly expand it ſelf ſo much
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and ſo briskly, that it manifeſtly lifted up
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ſome light Bodies that lean'd upon it, </
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