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

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1as is uſual, ſome little Particles of Air in
the ſpace it deſerted, as we gheſt by ob
ſerving, that upon the Application of hot
Bodies to the upper part of the Tube, the
Quick-ſilver would be a little depreſſ'd.
Laſtly, having put both the Tube and the
Veſſel it lean'd on into a convenient
Wooden Frame, to keep them from miſ
chances: we plac'd that Frame in a Win
dow within my Bed-chamber, that I might
both keep the Mercury from being ſtirr'd,
and have opportunity to watch from time
to time the Phænomena it was to exhibit.
For the better diſcovery of which, when
the Quick-ſilver both in the Tube and
ſubjacent Veſſel was perfectly at reſt, we
took notice, by a mark made on the out
ſide of the Glaſs, how high the included
Liquor then reach'd.

Experi
ment 18.

During ſeveral Weeks that the Tube
was kept in that Window (which was very
rarely open'd) I had the opportunity to
obſerve, that the Quick-ſilver did ſome
times faintly imitate the Liquor of a
Weather-glaſs, ſubſiding a little in warm,
and riſing a little in cold Weather, which
we aſcribed to the greater or leſſer preſſure
of that little Air that remain'd at the top
of the Tube, expanded or condenſ'd by

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