1ther, will gather up all the little bubbles,
and unite them with itſelf into one great
one, ſo that if by reinverting the Tube
you let that bubble return to the open
end of it, you will have a much cloſer Mer
curial Cylinder then before, and need but
to adde a very little Quick-ſilver more to
fill up the Tube exactly. And laſtly, as for
thoſe leſſer and inconſpicuous parcels of
Air which cannot this way be gleaned up,
You may endeavor before you invert the
Tube, to free the Quick-ſilver from them
by ſhaking the Tube, and gently knock
ing on the out-ſide of it, after every little
parcel of Quick-ſilver which you pour in;
and afterwards, by forcing the ſmall la
titant bubbles of Air to diſcloſe them
ſelves and break, by imploying a hot Iron
in ſuch manner as we lately mention'd. I
remember that by carefully filling the
Tube, though yet it were not quite free
from Air, we have made the Mercurial
Cylinder reach to 30 Inches and above an
eighth, and this in a very ſhort Tube:
which we therefore mention, becauſe we
have found, by experience, that in ſhort
Tubes a little Air is more prejudicial to
the Experiment then in long ones, where
the Air having more room to expand it
and unite them with itſelf into one great
one, ſo that if by reinverting the Tube
you let that bubble return to the open
end of it, you will have a much cloſer Mer
curial Cylinder then before, and need but
to adde a very little Quick-ſilver more to
fill up the Tube exactly. And laſtly, as for
thoſe leſſer and inconſpicuous parcels of
Air which cannot this way be gleaned up,
You may endeavor before you invert the
Tube, to free the Quick-ſilver from them
by ſhaking the Tube, and gently knock
ing on the out-ſide of it, after every little
parcel of Quick-ſilver which you pour in;
and afterwards, by forcing the ſmall la
titant bubbles of Air to diſcloſe them
ſelves and break, by imploying a hot Iron
in ſuch manner as we lately mention'd. I
remember that by carefully filling the
Tube, though yet it were not quite free
from Air, we have made the Mercurial
Cylinder reach to 30 Inches and above an
eighth, and this in a very ſhort Tube:
which we therefore mention, becauſe we
have found, by experience, that in ſhort
Tubes a little Air is more prejudicial to
the Experiment then in long ones, where
the Air having more room to expand it