Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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