Casati, Paolo
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Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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Ita verò ſe habuit obſeruatio. </
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<
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>Æream Æo
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lipilam propemodùm candentem omnique
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humore deſtitutam expendi primùm bilan
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ce iuſtiſsimâ; deinde eiuſdem refrigeratæ &
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ad naturalem temperiem reſtitutæ pondus
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examinaui, & animaduerti illam factam̨
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fuiſſe quatuor vt minimum grauis grauio
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rem: Hinc intuli aërem, qui rarefactionę
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exierat, & naturali condenſatione fuerat ite
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rùm in Æolipilam admiſſus, habere in gra
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uitate quatuor grana. </
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<
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>Iterum Æolipilam,
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vt priùs, calefeci, quæ eiuſdem quoquè pon
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deris, vt priùs, inuenta eſt: & illicò eius ro
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ſtrum in aquam immerſi, vt aquam ſugeret:
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ſuxit autem aquæ vncias 9, drachmas 3, gra
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na 25; quæ ſunt in vniuerſum (ſi ſingulis
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drachmis grana 72 tribuantur, & vnciis gra
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na 576) grana 5425; quod eſt pondus aquæ
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occupantis idem ſpatium, quod occupabat
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aër vi rarefactionis excluſus. </
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<
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>Eſt igitur gra
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uitas aquæ granorum 5425 ad grauitatem̨
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aëris ſecundùm molem æqualis gran 4, hoc
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eſt vt 1356 ad 1. Quarè ſatis liberaliter age
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re mihi videor, ſi dixero aërem ad aquam in
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leuitate eſſe vt 1200 ad 1. </
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Guld.
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<
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> Quàm vellem hæc omninò veri
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tati congruere! Sed veniam dabis non qui
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dem improbanti conatum, ſed penſicula</
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