1then a Crows Quill, that the changes of
the Air in that. Glaſs Egge might be the
more conſpicuous; Then there was con
vey'd into the Glaſs five or ſix Spoon
fulls of Water, part of which, by blow
ing Air into the Egge, was raiſ'd into the
above-mention'd ſlender part of the Pipe,
ſo that the Water was interpoſ'd between
the external Air, and that included in the
Egge. This Weather-glaſs (delineated
in the fourteenth Figure) was ſo plac'd,
and cloſ'd up in the cavity of one of our
ſmall Receivers, that onely the ſlender
part of the Pipe, to the heigth of four
or five Inches, paſſing thorow a hole in
the Cover, remain'd expoſ'd to the open
Air.
the Air in that. Glaſs Egge might be the
more conſpicuous; Then there was con
vey'd into the Glaſs five or ſix Spoon
fulls of Water, part of which, by blow
ing Air into the Egge, was raiſ'd into the
above-mention'd ſlender part of the Pipe,
ſo that the Water was interpoſ'd between
the external Air, and that included in the
Egge. This Weather-glaſs (delineated
in the fourteenth Figure) was ſo plac'd,
and cloſ'd up in the cavity of one of our
ſmall Receivers, that onely the ſlender
part of the Pipe, to the heigth of four
or five Inches, paſſing thorow a hole in
the Cover, remain'd expoſ'd to the open
Air.
Experi
ment 39.
ment 39.
The Pump being ſet a work, upon
the Exſuction of the Air, the Water in
the Pipe deſcended about a quarter of an
Inch, and this upon two or three reitera
ted tryals; which ſeem'd ſufficiently to
argue that there was no heat produc'd in
the Receiver upon the Exſuction of the
Air: For even a little heat would pro
bably have been diſcover'd by that Wea
ther-glaſs, ſince upon the bare applica
tion of my hand to the outſide of the
Receiver, the warmth having after ſome
the Exſuction of the Air, the Water in
the Pipe deſcended about a quarter of an
Inch, and this upon two or three reitera
ted tryals; which ſeem'd ſufficiently to
argue that there was no heat produc'd in
the Receiver upon the Exſuction of the
Air: For even a little heat would pro
bably have been diſcover'd by that Wea
ther-glaſs, ſince upon the bare applica
tion of my hand to the outſide of the
Receiver, the warmth having after ſome
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