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

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1to divers ingenious perſons has at firſt
ſight ſeem'd very wonderful.

THe thing that is wont to be admired,

and which may paſs for our ſecond
Experiment is this, That if, when the
Receiver is almoſt empty, a By-ſtander
be deſired to lift up the braſs Key (former
ly deſcribed as a ſtopple in the braſs Co
ver) he will finde it a very difficult thing
to do ſo, if the Veſſel be well exhauſted;
and even when but a moderate quantity of
Air has been drawn out, he will, when he
has lifted it up a little, ſo that it is ſome
what looſe from the ſides of the lip or
ſocket, which (with the help of a little
oyl) it exactly filled before, he will (I ſay)
finde it ſo difficult to be lifted up, that
he will imagine there is ſome great weight
faſtned to the bottom of it. And if (as
ſometimes has been done for merriment)
onely a Bladder be tyed to it, it is plea
ſant to ſee how men will marvail that ſo
light a Body, filled at moſt but with Air,
ſhould ſo forcibly draw down their hand
as if it were fill'd with ſome very ponder
ous thing: whereas the cauſe of this pret
ty Phænomenon ſeems plainly enough to

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