1Stop-cock, there was ſpeedily apply'd a
tapering Valve of braſs, ſuch as is deſcrib'd
in the 9th fig: made fit to go with its nar
rower end into the cavity of the branch,
and to fill the orifice of that cavity with
its broader part. And that the Air might
not get in at the litle intervals, left here
and there between the convex ſurface of
the ſtopple and the internall edge of the
branch, thoſe intervals were ſtop't with
a little Diachylon. And to the doore,
or, (if you pleaſe) that part of the Valve
which was to move to and fro, and in
this Experiment hung perpendicular to
the Horizon, there was, at a button of
braſs belonging to the Valve faſten'd a
broad ſcale wherein weights were to be
put. This done the key of the Stop-cock
was turn'd, and the externall Air beating
like a forcible ſtreame upon the Valve
to get in there, it did ſuddenly both ſhut
the Valve and keep it ſhut ſo ſtrongly,
that we had time to caſt in diverſe weights
one after another into the Scale; till at
length the weight overpowering the preſ
ſure of the Atmoſphere, drew downe the
Valve by the ſtringes that ty'd the Scale
to it, and gave liberty to the outward Air
to ruſh into the Receiver. Though a-
tapering Valve of braſs, ſuch as is deſcrib'd
in the 9th fig: made fit to go with its nar
rower end into the cavity of the branch,
and to fill the orifice of that cavity with
its broader part. And that the Air might
not get in at the litle intervals, left here
and there between the convex ſurface of
the ſtopple and the internall edge of the
branch, thoſe intervals were ſtop't with
a little Diachylon. And to the doore,
or, (if you pleaſe) that part of the Valve
which was to move to and fro, and in
this Experiment hung perpendicular to
the Horizon, there was, at a button of
braſs belonging to the Valve faſten'd a
broad ſcale wherein weights were to be
put. This done the key of the Stop-cock
was turn'd, and the externall Air beating
like a forcible ſtreame upon the Valve
to get in there, it did ſuddenly both ſhut
the Valve and keep it ſhut ſo ſtrongly,
that we had time to caſt in diverſe weights
one after another into the Scale; till at
length the weight overpowering the preſ
ſure of the Atmoſphere, drew downe the
Valve by the ſtringes that ty'd the Scale
to it, and gave liberty to the outward Air
to ruſh into the Receiver. Though a-