1Pipes and Siphons formerly mention'd,
but will return to our Bubble; and take
notice, That we thought fit alſo to en
deavor to meaſure the capacity of the
Bubble we had made uſe of, by filling
it with Water, that we might the better
know how much Water anſwered in
weight to 3/4 of a Grain of Air, but not
withſtanding all the diligence that was
uſed to preſerve ſo brittle a Veſſel, it
broke before we could perfect what we
were about, and we were not then pro
vided of another Bubble fit for our
turn.
but will return to our Bubble; and take
notice, That we thought fit alſo to en
deavor to meaſure the capacity of the
Bubble we had made uſe of, by filling
it with Water, that we might the better
know how much Water anſwered in
weight to 3/4 of a Grain of Air, but not
withſtanding all the diligence that was
uſed to preſerve ſo brittle a Veſſel, it
broke before we could perfect what we
were about, and we were not then pro
vided of another Bubble fit for our
turn.
The haſte I was in, My Lord, when I
ſent away the laſt Sheet, made me forget
to take notice to you of a Problem that
occurr'd to my thoughts, upon the oc
caſion of the ſlow breaking of the Glaſs
Bubble in our evacuated Receiver. For
it may ſeem ſtrange, ſince by our ſixth
Experiment it appears, that the Air, when
permitted, will by its own internal Spring
expand it ſelfe twice as much as Mer
ſennus was able to expand it, by the
heat even of a candent Æolipile: Yet
the Elater of the Air was ſcarce able to
break a very thin Glaſs Bubble, and ut-
ſent away the laſt Sheet, made me forget
to take notice to you of a Problem that
occurr'd to my thoughts, upon the oc
caſion of the ſlow breaking of the Glaſs
Bubble in our evacuated Receiver. For
it may ſeem ſtrange, ſince by our ſixth
Experiment it appears, that the Air, when
permitted, will by its own internal Spring
expand it ſelfe twice as much as Mer
ſennus was able to expand it, by the
heat even of a candent Æolipile: Yet
the Elater of the Air was ſcarce able to
break a very thin Glaſs Bubble, and ut-