Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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a Liquor, we inclin'd the Engine that con
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tain'd it, ſometimes to one ſide, and ſome
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times to the other; and obſerv'd the
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ſmoak to keep its ſurface almoſt Hori
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zontal, notwithſtanding the ſtooping of
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the Veſſel that held it, as Water or an
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other Liquor would in the like caſe have
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>And if by a quicker rocking of the
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Engine the ſmoke were more ſwiftly ſha
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ken, it would, like Water, either Vibrate
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to and fro from one ſide to the other of
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the Glaſs, or elſe have its ſurface manifeſt
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ly curll'd with Waves, but preſerve its
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ſelf in an intire and diſtinct Body from the
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incumbent Air; and being permitted to
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reſt awhile, would ſoon recover its for
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mer ſmooth and level
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ſuperficies:
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If alſo
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the Key were turn'd and the Valve un
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ſtopp'd, ſo that there was a free, though
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but a narrow paſſage open'd betwixt the
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external Air and the cavity of the Recei
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ver, then would ſome of this ſmoak fall
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down, as it were, in a ſtream into the ſub
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jacent Cylinder, and a proportionate
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quantity of the outward Air, would ma
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nifeſtly aſcend through it into the incum
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bent Air, much after the ſame manner as
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if you invert a Viol with a long Neck, and
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well fill'd with Red-Wine, into a Glaſs </
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