1a Liquor, we inclin'd the Engine that con
tain'd it, ſometimes to one ſide, and ſome
times to the other; and obſerv'd the
ſmoak to keep its ſurface almoſt Hori
zontal, notwithſtanding the ſtooping of
the Veſſel that held it, as Water or an
other Liquor would in the like caſe have
done. And if by a quicker rocking of the
Engine the ſmoke were more ſwiftly ſha
ken, it would, like Water, either Vibrate
to and fro from one ſide to the other of
the Glaſs, or elſe have its ſurface manifeſt
ly curll'd with Waves, but preſerve its
ſelf in an intire and diſtinct Body from the
incumbent Air; and being permitted to
reſt awhile, would ſoon recover its for
mer ſmooth and level ſuperficies: If alſo
the Key were turn'd and the Valve un
ſtopp'd, ſo that there was a free, though
but a narrow paſſage open'd betwixt the
external Air and the cavity of the Recei
ver, then would ſome of this ſmoak fall
down, as it were, in a ſtream into the ſub
jacent Cylinder, and a proportionate
quantity of the outward Air, would ma
nifeſtly aſcend through it into the incum
bent Air, much after the ſame manner as
if you invert a Viol with a long Neck, and
well fill'd with Red-Wine, into a Glaſs
tain'd it, ſometimes to one ſide, and ſome
times to the other; and obſerv'd the
ſmoak to keep its ſurface almoſt Hori
zontal, notwithſtanding the ſtooping of
the Veſſel that held it, as Water or an
other Liquor would in the like caſe have
done. And if by a quicker rocking of the
Engine the ſmoke were more ſwiftly ſha
ken, it would, like Water, either Vibrate
to and fro from one ſide to the other of
the Glaſs, or elſe have its ſurface manifeſt
ly curll'd with Waves, but preſerve its
ſelf in an intire and diſtinct Body from the
incumbent Air; and being permitted to
reſt awhile, would ſoon recover its for
mer ſmooth and level ſuperficies: If alſo
the Key were turn'd and the Valve un
ſtopp'd, ſo that there was a free, though
but a narrow paſſage open'd betwixt the
external Air and the cavity of the Recei
ver, then would ſome of this ſmoak fall
down, as it were, in a ſtream into the ſub
jacent Cylinder, and a proportionate
quantity of the outward Air, would ma
nifeſtly aſcend through it into the incum
bent Air, much after the ſame manner as
if you invert a Viol with a long Neck, and
well fill'd with Red-Wine, into a Glaſs