Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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Merſ.
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<
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qua ad propoſitum quæſtionis terminum
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euadamus? </
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Guld.
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bitationis, ad ignota progrediendum cenſeo. </
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Illud autem carere videtur omni dubitatio
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ne, quod ſi aqua in aëre grauis eſt vt 5 1/3, aër </
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viciſsim in aquâ leuis eſt vt 5 1/3. Nam, vt
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herì ratiocinabamur, vas cupreum pedalę
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lib. 80. nihil grauitat in aquâ, ſi aëre implea
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tur, quia ſcilicet aëris incluſi leuitas elidit
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eam cupri grauitatem, quam aqua non tol
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lit: Cum enim cuprum amittat ſolùm lib.
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(9 1/71) ratione aquæ ſecundùm molem æqualis,
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reliquum pondus decedit ratione leuitatis aë
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ris: illud autem eſt pondus aquæ ſecundùm
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molem aëri æqualis. </
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<
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>Quarè ſi æolipila can
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dens amiſit 4 grana ponderis, licebit argue
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re aërem ignitum in aëre communi leuitare
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vt 4. Item quia in eodem aëre communi
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aqua æolipilam implens grauior eſt granis
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5425, ſacomate ſemper in eodem medio exi
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ſtente, colligere poſſumus Rationem ali
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quam inter aquam & aërem ignitum, mu
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tuantes ab Algebrâ numeros defectiuos. </
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LXXXI
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Quomodo
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inueniatur
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quanta ſit
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aëris igniti
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leuitas iņ
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aqua.
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<
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>Eſt ſiquidem in aëre communi æqualium
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molium grauitas ſimili granorum menſurâ
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deprehenſa, Aquæ quidem ſaltem graną </
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