Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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ther, will gather up all the little bubbles,
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and unite them with itſelf into one great
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one, ſo that if by reinverting the Tube
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you let that bubble return to the open
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end of it, you will have a much cloſer Mer
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curial Cylinder then before, and need but
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to adde a very little Quick-ſilver more to
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fill up the Tube exactly. </
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>And laſtly, as for
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thoſe leſſer and inconſpicuous parcels of
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Air which cannot this way be gleaned up,
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You may endeavor before you invert the
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Tube, to free the Quick-ſilver from them
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by ſhaking the Tube, and gently knock
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ing on the out-ſide of it, after every little
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parcel of Quick-ſilver which you pour in;
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and afterwards, by forcing the ſmall la
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titant bubbles of Air to diſcloſe them
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ſelves and break, by imploying a hot Iron
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in ſuch manner as we lately mention'd. </
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remember that by carefully filling the
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Tube, though yet it were not quite free
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from Air, we have made the Mercurial
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Cylinder reach to 30 Inches and above an
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eighth, and this in a very ſhort Tube:
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which we therefore mention, becauſe we
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have found, by experience, that in ſhort
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Tubes a little Air is more prejudicial to
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the Experiment then in long ones, where
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the Air having more room to expand it </
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