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

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1down the Sucker, would finde the reſiſt
ance of the external Air increaſ'd as he
draws it lower, more of the diſplaced Air
being thruſt into it to compreſs it. But, by
what has been diſcourſ'd upon the firſt
Experiment, it ſeems more probable, that
without any ſuch ſtrengthning of the preſ
ſure of the outward Air, the taking quite
away or the debilitating of the reſiſtance
from within, may ſuffice to produce the
effects under conſideration. But this will
perhaps be illuſtrated by ſome or other of
our future Experiments, and therefore
ſhall be no longer inſiſted on here.

Experi
ment 3.

HAving thus taken notice of ſome of

the conſtant Phænomena of our En
gine it ſelf, let us now proceed to the Ex
periments tryable in it.

Experi
ment 4.

We took then a Lambs Bladder large,
well dry'd, and very limber, and leaving in
it about half as much Air as it could con
tain, we cauſ'd the neck of it to be ſtrong
ly ty'd, ſo that none of the included Air,
though by preſſure, could get out. This
Bladder being convey'd into the Receiver,
and the Cover luted on, the Pump
was ſet awork, and after two or three
exſuctions of the ambient Air (where
by the Spring of that which remain'd in

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