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. </s>
              <s>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. </s>
              <s>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. </s>
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