Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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6862HERONIS
XLV.
Et ſphæræ trepudiant hoc modo.
Lebes aquam ha-
52[Figure 52] bens cooperto ore
ſuccenditur.
Ab oper-
culo autem procedit
tubus, ex cujus extre-
mo dimidia ſphæra
concava ſimul perfo-
ratur.
Si igitur le-
vem ſphærulam in di-
midiam ſphæram in-
jiciamus, continget
vaporem, qui ex le-
bete per tubum attol-
litur, ſphærulam ele-
vare adeo ut tripudia-
re videatur.
XLVI.
Fit etiam ſphæra perſpicua aërem & aquam intra ſeſe con-
tinens, &
in medio ipſius ſphærulam inſtar mundi.
Fiunt enim duo hemiſphæria ex
53[Figure 53] vitro quorum alterum obtegitur la-
mina ærea, in medio foramen rotun-
dum habente:
fit autem ſphærula mi-
nor, ac levis, &
in aquam quæ eſt in
altero hemiſphærio injicitur.
Poſtea
huic apponitur hemiſphærium obte-
ctum, &
humidi quantitate extracta
ex aqua, qui in medio eſt locus ſphæ-
rulam continebit.
Ergo altero he-
miſphærio perficietur id, quod pro-
poſitum eſt.

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