Boyle, Robert - New experiments physico-mechanicall, touching the spring of the air and its effects

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1parcel of Air might by this its own Spring
be dilated. And though we were not pro
vided of Inſtruments fit to meaſure the
dilatation of the Air any thing accurately,
yet becauſe an imperfect meaſure of it was
more deſireable then none at all, we de
viſ'd the following Method as very eaſily
practicable.

Experi
ment 6.

We took a limber Lambs Bladder
which was thorowly wetted in fair Water,
that the ſides of it being ſqueez'd roge
ther, there might be no Air left in its
folds: (as indeed we could not afterwards
upon tryal diſcern any) The neck of this
Bladder was ſtrongly tyed about that of
a ſmall Glaſs, (capable of holding five
full drachmes of Water) the Bladder be
ing firſt ſo compreſſ'd, that all the inclu
ded Air was onely in the Glaſs, without
being preſſ'd there; then the Pump be
ing ſet awork after a few exſuctions, the
Air in the little Viol began to dilate it
ſelf and produce a ſmall Tumor in the
Neck of the Bladder; and as the ambi
ent Air was more and more drawn away,
ſo the included Air penetrated further and
further into the Bladder, and by degrees
lifted up the ſides and diſplay'd its folds,
till at length it ſeem'd to have blown it

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