Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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of the ambient Atmoſphere upon the
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incloſed Air; which hereby appears to
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bear up on the Mercury, rather by virtue
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of its ſpring, then of its weight: ſince its
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weight cannot be ſuppoſ'd to amount to
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above two or three Ounces, which is in
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conſiderable in compariſon of ſuch a Cy
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linder of Mercury as it would keep from
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ſubſiding. </
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>All things being thus in a readineſs, the
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Sucker was drawn down; and, immedi
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ately upon the egreſs of a Cylinder of
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Air out of the Receiver; the Quick-ſilver
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in the Tube did, according to expectati
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on, ſubſide: and notice being carefully
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taken (by a mark faſten'd to the outſide)
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of the place where it ſtopt, we cauſ'd him
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that manag'd the Pump to pump again,
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and mark'd how low the Quick-ſilver fell
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at the ſecond exſuction; but continuing
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this work, we were quickly hindred from
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accurately marking the Stages made by
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the Mercury in its deſcent, becauſe it ſoon
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ſunk below the top of the Receiver; ſo
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that we could thenceforward mark it no
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other ways then by the eye. </
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>And thus,
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continuing the labor of pumping for a
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bout a quarter of an hour, we found our
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ſelves unable to bring the Quick-ſilver in </
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