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

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1of the ambient Atmoſphere upon the
incloſed Air; which hereby appears to
bear up on the Mercury, rather by virtue
of its ſpring, then of its weight: ſince its
weight cannot be ſuppoſ'd to amount to
above two or three Ounces, which is in
conſiderable in compariſon of ſuch a Cy
linder of Mercury as it would keep from
ſubſiding.

All things being thus in a readineſs, the
Sucker was drawn down; and, immedi
ately upon the egreſs of a Cylinder of
Air out of the Receiver; the Quick-ſilver
in the Tube did, according to expectati
on, ſubſide: and notice being carefully
taken (by a mark faſten'd to the outſide)
of the place where it ſtopt, we cauſ'd him
that manag'd the Pump to pump again,
and mark'd how low the Quick-ſilver fell
at the ſecond exſuction; but continuing
this work, we were quickly hindred from
accurately marking the Stages made by
the Mercury in its deſcent, becauſe it ſoon
ſunk below the top of the Receiver; ſo
that we could thenceforward mark it no
other ways then by the eye. And thus,
continuing the labor of pumping for a
bout a quarter of an hour, we found our
ſelves unable to bring the Quick-ſilver in

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