Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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thereby opening an acceſs to the external
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Air, the Sucker would be immediately
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drawn down: After this, I ſay, we made
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this further Experiment, That having by
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a Man's ſtrength forcibly depreſſ'd the
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Sucker to the bottom of the Cylinder,
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and then faſtned weights to the above
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named Iron that makes part of that Suc
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ker, the preſſure of the external Air find
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ing little or nothing in the cavity of the
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evacuated Cylinder to reſiſt it, did pre
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ſently begin to impell the Sucker, with
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the weights that clogg'd it, towards the
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upper part of the Cylinder, till ſome
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ſuch accidental Impediment as we former
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ly mention'd, check'd its courſe; and
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when that rub, which eaſily might be, was
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taken out of the way, it would continue
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its aſcent to the top, to the no ſmall won
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der of thoſe By ſtanders, that could not
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comprehend how ſuch a weight could aſ
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cend, as it were, of it ſelf; that is, with
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out any viſible force, or ſo much as Su
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ction to lift it up. </
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>And indeed it is very
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conſiderable, that though poſſibly there
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might remain ſome particles of Air in the
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Cylinder, after the drawing down of the
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Sucker; yet the preſſure of a Cylinder of
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the Atmoſphere, ſomewhat leſs then </
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