Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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6963SPIRITAL. LIBER.
XLVII.
Quæ gutta appellatur, ſtillat ſole in ipſam ingruente.
54[Figure 54]
Sit baſis præcluſa A B C D, per quaminfundibulum impellatur, cujus
caulis à fundo paululum diſtet:
& ſit ſphærula E F, ex qua tubus in baſim
feratur, à fundo vaſis, &
à pariete ſphærulæ parum diſtans. Inflexus
autem ſiphon ſphærulæ aptatus feratur in infundibulum, &
in ſphærulam
aqua injiciatur.
Quando igitur ſol in ſphærulam ingruit, calefactus aër
exiſtens in ipſa humidum expellit.
Quod quidem fertur perſiphonem G,
&
per infundibulum in baſim procedet. Sed cum ſphærula obumbrata fue-
rit excedente aëre, tubus, qui ducitur per ſphærulam humidum aſſumet,
&
locum exinanitum replebit. Atque hoc toties erit, quoties ſol in ipſam
ingruet.

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