Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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<
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>WE will now proceed to obſerve that
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though, by the help of the handle,
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the Sucker be eaſily drawn down to the
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bottom of the Cylinder; yet, without
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the help of that Leaver, there would be
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required to the ſame effect, a force or
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weight great enough to ſurmount the
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preſſure of the whole Atmoſphere: Since
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otherwiſe the Air would not be driven out
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of its place, when none is permitted to
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ſucceed into the place deſerted by the
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Sucker. </
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<
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>This ſeems evident, from the
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known
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Torricellian
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Experiment, in which,
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if the inverted Tube of
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Mercury
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be but
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25 Digits high, or ſomewhat more, the
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Quick-ſilver will not fall but remain ſuſ
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pended in the Tube; becauſe it cannot
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preſs the ſubjacent
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Mercury
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with ſo great
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a force, as does the incumbent Cylinder
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of the Air reaching thence to the top of
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the Atmoſphere: Whereas, if the Cy
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linder of
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Mercury
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were three or four digits
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longer, it would over-power that of the
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external Air, and run out into the Veſſel'd
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Mercury,
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till the two Cylinders came to
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an
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Æquilibrium,
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and no further. </
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<
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>Hence
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we need not wonder, that though the </
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