1ting into one of theſe, wherein it had but
little room to expand and diſplay it ſelf,
might preſs as much upon all parts of the
internal ſurface of the Veſſel, and upon
the included Bodies, as a greater quan
tity of Air in a Veſſel in whoſe capacity
it might finde more room to expand it
ſelf.
little room to expand and diſplay it ſelf,
might preſs as much upon all parts of the
internal ſurface of the Veſſel, and upon
the included Bodies, as a greater quan
tity of Air in a Veſſel in whoſe capacity
it might finde more room to expand it
ſelf.
The other thing that we were to ad
vertiſe, is, That 'tis not every ſmall crack
that can make ſuch a Receiver as is of a
roundiſh Figure altogether uſeleſs to our
Experiment, in regard that upon the ex
ſuction of the internal Air, the ambient
Air on all ſides preſſing the Glaſs inwards
or towards the middle, does conſequent
ly thruſt the Lips of the crack cloſer, and
ſo rather cloſe then increaſe it.
vertiſe, is, That 'tis not every ſmall crack
that can make ſuch a Receiver as is of a
roundiſh Figure altogether uſeleſs to our
Experiment, in regard that upon the ex
ſuction of the internal Air, the ambient
Air on all ſides preſſing the Glaſs inwards
or towards the middle, does conſequent
ly thruſt the Lips of the crack cloſer, and
ſo rather cloſe then increaſe it.
This I mention partly becauſe Recei
vers fit for our turn are more eaſily
crack'd then procur'd, and therefore ought
not to be unneceſſarily thrown away as
unſerviceable: And partly becauſe I think
it becomes one that profeſſes himſelf a
faithful Relator of Experiments, not to
conceal from Your Lordſhip, that after a
few of the foregoing Experiments were
made, there happen'd in the great Recei
ver a crack of about a Span long, begin-
vers fit for our turn are more eaſily
crack'd then procur'd, and therefore ought
not to be unneceſſarily thrown away as
unſerviceable: And partly becauſe I think
it becomes one that profeſſes himſelf a
faithful Relator of Experiments, not to
conceal from Your Lordſhip, that after a
few of the foregoing Experiments were
made, there happen'd in the great Recei
ver a crack of about a Span long, begin-
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