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

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TO proceed now to the Phænomena,

exhibited to us by the Engine above
deſcribed; I hold it not unfit to begin
with what does conſtantly and regularly
offer it ſelf to our obſervation, as depend
ing upon the Fabrick of the Engine it ſelf,
and not upon the nature of this or that
particular Experiment which 'tis employ
ed to try.

Experi
ment 1.

Firſt, Then upon the drawing down
of the Sucker, (the Valve being ſhut) the
Cylindrical ſpace, deſerted by the Sucker,
is left de void of Air; and therefore, up
on the turning of the Key, the Air con
tained in the Receiver ruſhes into the em
ptyed Cylinder, till the Air in both thoſe
Veſſels be brought to about an equal
meaſure of dilatation. And therefore,
upon ſhutting the Receiver by returning
the Key, if you open the Valve, and force
up the Sucker again, you will finde, that
after this firſt exſuction you will drive
out almoſt a whole Cylinder full of Air:
But at the following exſuctions, you will
draw leſs and leſs of Air out of the Recei
ver into the Cylinder, becauſe that there
will ſtill remain leſs and leſs Air in the

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