Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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a Quart; but that (agreeably to what we
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formerly obſerved) we found it as difficult
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to bring this to be quite empty as to eva
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cuate the greater; the leaſt external Air
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that could get in (and we could not poſſi
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bly keep it all perfectly out) ſufficing in ſo
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ſmall a Veſſel to diſplay a conſiderable
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preſſure upon the ſurface of the Mercury,
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and thereby hinder that in the Tube from
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falling to a level with it. </
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>But this is remark
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able, that having two or three times try'd
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the Experiment in that ſmall Veſſel, upon
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the very firſt Cylinder of Air that was
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drawn out of the Receiver, the Mercury
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fell in the Tube 18 Inches and a half, and
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at another 19 Inches and a half. </
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>But, on this occaſion, I hold it not un
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fit to give Your Lordſhip notice that I
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hop'd, from the deſcent of the Quick
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ſilver in the Tube upon the firſt ſuck, to
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derive this advantage: that I ſhould thence
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be enabled to give a near gueſs at the pro
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portion of force betwixt the preſſure of
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the Air (according to its various ſtates, as
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to Denſity and Rarefaction) and the gra
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vity of Quick-ſilver, then hitherto has
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been done. </
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<
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>For in our Experiment there
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are diverſe things given, that may be
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made uſe of towards ſuch a diſcovery. </
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