Boyle, Robert - New experiments physico-mechanicall, touching the spring of the air and its effects

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1Receiver it ſelf; and conſequently, the
Particles of the remaining Air, having
more room to extend themſelves in, will
leſs preſs out one another. This you will
eaſily perceive, by finding, that you ſtill
force leſs and leſs Air out of the Cylin
der; ſo that when the Receiver is almoſt
exhauſted, you may force up the Sucker
almoſt to the top of the Cylinder, be
fore you will need to unſtop the Valve to
let out any Air: And if at ſuch time, the
Valve being ſhut, you let go the handle of
the Pump, you will finde the Sucker for
cibly carryed up to the top of the Cylin
der, by the protruſion of the external Air;
which, being much leſs rarified then that
within the Cylinder, muſt have a more
forcible preſſure upon the Sucker, then
the internal is able to reſiſt: And by this
means you may know how far you have
emptyed the Receiver. And to this we
may adde, on this occaſion, that conſtant
ly upon the turning of the Key to let out
the Air from the Receiver, into the em
ptied Cylinder, there is immediately pro
duced a conſiderably brisk noiſe, eſpeci
ally whil'ſt there is any plenty of Air in
the Receiver.

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