1fill up all the crannies, or other little ca
vities, at which the Air might otherwiſe
get entrance.
vities, at which the Air might otherwiſe
get entrance.
All things being thus fitted, and the
lower ſhank (O) of the ſtop-cock being
put into the upper Orifice of the Cylin
der (&), into which it was exactly ground;
the Experimenter is firſt, by turning the
handle, to force the Sucker to the top of
the Cylinder, that there may be no Air
left in the upper part of it: Then ſhut
ting the Valve with the Plug, and turning
the other way, he is to draw down the
Sucker to the bottom of the Cylinder;
by which motion of the Sucker, the Air
that was formerly in the Cylinder being
thruſt out, and none being permitted to
ſucceed in its room, 'tis manifeſt that the
cavity of the Cylinder muſt be empty,
in reference to the Air: So that if there
upon the Key of the Stop-cock be ſo
turn'd, as that through the perforation of
it, a free paſſage be opened betwixt the
Cylinder and the Receiver, part of the
Air formerly contain'd in the Receiver,
will nimbly deſcend into the Cylinder.
And this Air, being by the turning back
of the Key hinder'd from the returning
into the Receiver, may, by the opening
lower ſhank (O) of the ſtop-cock being
put into the upper Orifice of the Cylin
der (&), into which it was exactly ground;
the Experimenter is firſt, by turning the
handle, to force the Sucker to the top of
the Cylinder, that there may be no Air
left in the upper part of it: Then ſhut
ting the Valve with the Plug, and turning
the other way, he is to draw down the
Sucker to the bottom of the Cylinder;
by which motion of the Sucker, the Air
that was formerly in the Cylinder being
thruſt out, and none being permitted to
ſucceed in its room, 'tis manifeſt that the
cavity of the Cylinder muſt be empty,
in reference to the Air: So that if there
upon the Key of the Stop-cock be ſo
turn'd, as that through the perforation of
it, a free paſſage be opened betwixt the
Cylinder and the Receiver, part of the
Air formerly contain'd in the Receiver,
will nimbly deſcend into the Cylinder.
And this Air, being by the turning back
of the Key hinder'd from the returning
into the Receiver, may, by the opening