Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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fill up all the crannies, or other little ca
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vities, at which the Air might otherwiſe
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get entrance. </
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>All things being thus fitted, and the
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lower ſhank (O) of the ſtop-cock being
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put into the upper Orifice of the Cylin
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der (&), into which it was exactly ground;
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the Experimenter is firſt, by turning the
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handle, to force the Sucker to the top of
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the Cylinder, that there may be no Air
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left in the upper part of it: Then ſhut
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ting the Valve with the Plug, and turning
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the other way, he is to draw down the
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Sucker to the bottom of the Cylinder;
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by which motion of the Sucker, the Air
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that was formerly in the Cylinder being
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thruſt out, and none being permitted to
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ſucceed in its room, 'tis manifeſt that the
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cavity of the Cylinder muſt be empty,
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in reference to the Air: So that if there
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upon the Key of the Stop-cock be ſo
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turn'd, as that through the perforation of
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it, a free paſſage be opened betwixt the
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Cylinder and the Receiver, part of the
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Air formerly contain'd in the Receiver,
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will nimbly deſcend into the Cylinder.
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>And this Air, being by the turning back
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of the Key hinder'd from the returning
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into the Receiver, may, by the opening </
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