Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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the Tube totally to ſubſide; becauſe,
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when the Receiver was conſiderably em
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pty'd of its Air, and conſequently that
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little that remain'd grown unable to reſiſt
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the Irruption of the external, that Air
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would (in ſpight of whatever we could
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do) preſs in at ſome little Avenue or
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other; and though much could not there
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at get in, yet a little was ſufficient to coun
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terballance the preſſure of ſo ſmall a Cy
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linder of Quick-ſilver, as then remain'd
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in the Tube. </
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<
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>Now (to ſatisfie our ſelves further, that
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the failing of the Quick-ſilver in the
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Tube to a determinate height, proceeds
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from the
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Æquilibrium,
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wherein it is at
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that height with the external Air, the one
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gravitating, the other preſſing with equal
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force upon the ſubjacent Mercury) we Re
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turned the Key and let in ſome new Air;
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upon which the Mercury immediatly be
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gan to aſcend (or rather to be impell'd up
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wards) in the Tube, and continu'd aſcend
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ing, till having Return'd the Key it im
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mediatly reſted at the height which it had
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then attain'd: And ſo, by Turning and
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Returning the Key, we did ſeveral times
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at pleaſure impel it upwards, and check its
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aſcent. </
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<
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