Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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Receiver it ſelf; and conſequently, the
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Particles of the remaining Air, having
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more room to extend themſelves in, will
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leſs preſs out one another. </
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>This you will
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eaſily perceive, by finding, that you ſtill
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force leſs and leſs Air out of the Cylin
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der; ſo that when the Receiver is almoſt
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exhauſted, you may force up the Sucker
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almoſt to the top of the Cylinder, be
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fore you will need to unſtop the Valve to
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let out any Air: And if at ſuch time, the
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Valve being ſhut, you let go the handle of
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the Pump, you will finde the Sucker for
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cibly carryed up to the top of the Cylin
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der, by the protruſion of the external Air;
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which, being much leſs rarified then that
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within the Cylinder, muſt have a more
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forcible preſſure upon the Sucker, then
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the internal is able to reſiſt: And by this
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means you may know how far you have
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emptyed the Receiver. </
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>And to this we
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may adde, on this occaſion, that conſtant
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ly upon the turning of the Key to let out
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the Air from the Receiver, into the em
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ptied Cylinder, there is immediately pro
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duced a conſiderably brisk noiſe, eſpeci
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ally whil'ſt there is any plenty of Air in
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the Receiver. </
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