1is almoſt empty, ſome of the ſubtler
parts of the external Air may, by the
preſſure of the Atmoſphere, be ſtrain'd
through the very body of the Diachylon
into the Receiver. But this is onely con
jecture:
parts of the external Air may, by the
preſſure of the Atmoſphere, be ſtrain'd
through the very body of the Diachylon
into the Receiver. But this is onely con
jecture:
Another Circumſtance of our Expe
riment was this, That, if (when the
Quick-ſilver in the Tube was fallen low)
too much ingreſs were, at the hole of the
Stop-cock, ſuddenly permitted to the ex
ternal Air; it would ruſh in with that vio
lence, and bear ſo forcibly upon the ſur
face of the ſubjacent Quick-ſilver, that
it would impel it up into the Tube rudely
enough to endanger the breaking of the
Glaſs.
riment was this, That, if (when the
Quick-ſilver in the Tube was fallen low)
too much ingreſs were, at the hole of the
Stop-cock, ſuddenly permitted to the ex
ternal Air; it would ruſh in with that vio
lence, and bear ſo forcibly upon the ſur
face of the ſubjacent Quick-ſilver, that
it would impel it up into the Tube rudely
enough to endanger the breaking of the
Glaſs.
We formerly mention'd, that the
Quick-ſilver did not in its deſcent fall as
much at a time after the two or three firſt
exſuctions of the Air, as at the beginning:
For, having mark'd its ſeveral Stages up
on the Tube, we found, that at the firſt
ſuck it deſcended an Inch and 3/8, and at the
ſecond an Inch and 1/8; and when the Veſ
ſel was almoſt empty'd, it would ſcarce at
one exſuction be drawn down above the
breadth of a Barly-corn. And indeed we
found it very difficult to meaſure in what
Quick-ſilver did not in its deſcent fall as
much at a time after the two or three firſt
exſuctions of the Air, as at the beginning:
For, having mark'd its ſeveral Stages up
on the Tube, we found, that at the firſt
ſuck it deſcended an Inch and 3/8, and at the
ſecond an Inch and 1/8; and when the Veſ
ſel was almoſt empty'd, it would ſcarce at
one exſuction be drawn down above the
breadth of a Barly-corn. And indeed we
found it very difficult to meaſure in what