1thereby opening an acceſs to the external
Air, the Sucker would be immediately
drawn down: After this, I ſay, we made
this further Experiment, That having by
a Man's ſtrength forcibly depreſſ'd the
Sucker to the bottom of the Cylinder,
and then faſtned weights to the above
named Iron that makes part of that Suc
ker, the preſſure of the external Air find
ing little or nothing in the cavity of the
evacuated Cylinder to reſiſt it, did pre
ſently begin to impell the Sucker, with
the weights that clogg'd it, towards the
upper part of the Cylinder, till ſome
ſuch accidental Impediment as we former
ly mention'd, check'd its courſe; and
when that rub, which eaſily might be, was
taken out of the way, it would continue
its aſcent to the top, to the no ſmall won
der of thoſe By ſtanders, that could not
comprehend how ſuch a weight could aſ
cend, as it were, of it ſelf; that is, with
out any viſible force, or ſo much as Su
ction to lift it up. And indeed it is very
conſiderable, that though poſſibly there
might remain ſome particles of Air in the
Cylinder, after the drawing down of the
Sucker; yet the preſſure of a Cylinder of
the Atmoſphere, ſomewhat leſs then
Air, the Sucker would be immediately
drawn down: After this, I ſay, we made
this further Experiment, That having by
a Man's ſtrength forcibly depreſſ'd the
Sucker to the bottom of the Cylinder,
and then faſtned weights to the above
named Iron that makes part of that Suc
ker, the preſſure of the external Air find
ing little or nothing in the cavity of the
evacuated Cylinder to reſiſt it, did pre
ſently begin to impell the Sucker, with
the weights that clogg'd it, towards the
upper part of the Cylinder, till ſome
ſuch accidental Impediment as we former
ly mention'd, check'd its courſe; and
when that rub, which eaſily might be, was
taken out of the way, it would continue
its aſcent to the top, to the no ſmall won
der of thoſe By ſtanders, that could not
comprehend how ſuch a weight could aſ
cend, as it were, of it ſelf; that is, with
out any viſible force, or ſo much as Su
ction to lift it up. And indeed it is very
conſiderable, that though poſſibly there
might remain ſome particles of Air in the
Cylinder, after the drawing down of the
Sucker; yet the preſſure of a Cylinder of
the Atmoſphere, ſomewhat leſs then