Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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Sucker move eaſily enough up and down
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in the Cylinder by the help of the
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Manu
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brium;
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yet if the
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Manubrium
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be taken off,
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it will require & conſiderable ſtrength to
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move it either way. </
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>Nor will it ſeem
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ſtrange, that if, when the Valve and
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Stop-cock are well ſhut, you draw down
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the Sucker, and then let go the
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Manubri
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um;
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the Sucker will, as it were of it ſelf,
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re-aſcend to the top of the Cylinder, ſince
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the ſpring of the external Air findes no
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thing to reſiſt its preſſing up the Sucker.
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<
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>And for the ſame reaſon, when the Re
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ceiver is almoſt evacuated, though, ha
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ving drawn down the Sucker, you open
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the way from the Receiver to the Cylin
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der, and then intercept that way again by
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returning the Key; the Sucker will, up
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on the letting go the
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Manubrium,
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be
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forcibly carried up almoſt to the top of
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the Cylinder: Becauſe the Air within the
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Cylinder, being equally dilated and weak
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ned with that of the Glaſs, is unable to
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withſtand the preſſure of the external Air,
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till it be driven into ſo little ſpace, that
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there is an
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Æquilibrium
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betwixt its force
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and that of the Air without. </
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<
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>And con
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gruouſly hereunto we finde, that in this
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caſe, the Sucker is drawn down with little </
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