1nothing but the ordinary preſſure of the
contiguous Air. I know not whether it
be requiſite to take notice, that this Ex
periment was made indeed in a moiſt
Night, but in a Room, in whoſe Chim
ney there was burning a good Fire, which
did perhaps ſomewhat rarifie the Air of
which the bubble conſiſted.
contiguous Air. I know not whether it
be requiſite to take notice, that this Ex
periment was made indeed in a moiſt
Night, but in a Room, in whoſe Chim
ney there was burning a good Fire, which
did perhaps ſomewhat rarifie the Air of
which the bubble conſiſted.
It has ſeem'd almoſt incredible which is
related by the Induſtrious Merſennus, That
the Air by the violence of heat, though
as great as our Veſſels can ſupport with
out fuſion, can be ſo dilated as to take up
ſeventy times as much room as before:
Wherefore becauſe we were willing to
have a confirmation of ſo ſtrange a Phæno
menon; we once more convey'd into the
Tube a bubble of the bigneſs of the for
mer, and proſecuting the Experiment as
before with the ſame Water, we obſerved
that the Air did manifeſtly ſtretch it ſelf
ſo far, as to appear ſeveral times a good
way below the ſurface of the Water in the
Viol, and that too with a ſurface very
convex toward the bottom of the Pipe.
Nay, the Pump being ply'd a little lon
ger, the Air did manifeſtly reach to that
place where the bottom of the Tube
lean'd upon the bottom of the Viol, and
related by the Induſtrious Merſennus, That
the Air by the violence of heat, though
as great as our Veſſels can ſupport with
out fuſion, can be ſo dilated as to take up
ſeventy times as much room as before:
Wherefore becauſe we were willing to
have a confirmation of ſo ſtrange a Phæno
menon; we once more convey'd into the
Tube a bubble of the bigneſs of the for
mer, and proſecuting the Experiment as
before with the ſame Water, we obſerved
that the Air did manifeſtly ſtretch it ſelf
ſo far, as to appear ſeveral times a good
way below the ſurface of the Water in the
Viol, and that too with a ſurface very
convex toward the bottom of the Pipe.
Nay, the Pump being ply'd a little lon
ger, the Air did manifeſtly reach to that
place where the bottom of the Tube
lean'd upon the bottom of the Viol, and