Heron <Alexandrinus> - Heronis Alexandrini spiritalium liber

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5953SPIRITAL. LIBER.

44[Figure 44] coactæ per trochleam religentur ad pondus plumbeum, per quod deſcen-
dens valvæ claudentur. Siphon autem K L M habeat exterius crus in vas
ſuſpenſum deferens: & per quoddam foramen P aqua in ſphæram infun-
datur, adeo ut ad dimidium perveniat, quod quidem foramen poſt in-
fuſionem obturetur. Continget igitur igne evaporante aërem, qui eſt in
arula calefactum in ampliorem locum fundi. Hic autem per tubum F G
in ſphæram procedens, humorem, qui in ea continetur per ſiphonem
KLM in ſuſpenſum vas extrudet. Quod vas deſcendens attrahet catenu-
las, & valvas aperiet. Rurſus extincto igne aër quidem attenuatus exce-
det per raritates parietis ſphæræ. Inflexus autem ſiphon K L M humo-
rem ex vaſe ſuſpenſo attrahet, ita ut repleatur locus excretarum raritatum.
Erit enim ipſius extremitas immerſa in aqua, quæ in vaſe ſuſpenſo contine-
tur. Exinanito autem vaſe, & obid leviori facto, rurſus pondus ſuſpen-
ſum deorſum repens valvas occludet. Sunt qui pro aqua utuntur hydrar-
gyro, quoniam & aqua gravius eſt, & à caliditate facile ſolvitur.

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