Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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ſelf, does leſs potently preſs upon the ſub
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jacent Mercury. </
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>And ſince we are fallen upon the conſi
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deration of the Altitude of the Mercurial
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Cylinder, I muſt not conceal from Your
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Lordſhip an Experiment relating thereun
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to, which perhaps will ſet both You and
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many of your Friends the
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Virtuoſi
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a think
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ing; and, by diſcloſing ſome things a
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bout the Air or Atmoſphere that have
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ſcarce hitherto been taken notice of, may
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afford you ſome hints conducive to a fur
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ther diſcovery of the ſubject of this E
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piſtle. </
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>WE took a Glaſs Tube, which,
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though it were not much above
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three Foot long, we made choice of be
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cauſe it was of a more then ordinarily
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even thickneſs. </
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>This we fill'd with Mer
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cury, though not with as much care as we
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could, yet with ſomewhat more then is
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wont to be uſed in making the
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Torricellian
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Experiment. </
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>Then, having according to
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the manner inverted the Tube, and open'd
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the mouth of it beneath the ſurface of
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ſome other Quick-ſilver, that in the Tube
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fell down to the wonted heigth, leaving, </
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