Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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ex aſſiduâ plurimorum annorum obſeruatio
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ne id ſibi innotuiſſe, cum videret Lunam
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ad intimam, hoc eſt concauam, huius cru
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ſtæ ſuperficiem ita motus ſuos temperate, vt
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creet admirabilem illam librationem, quæ
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torquet Aſtronomico-Phyſicorum ingenia:
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cuius motûs hypotheſes nondum, quod
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ſciam, publici iuris fecit.
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LXXXIII
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Ignis ſub
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terraneus
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est quarta
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pars globi
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terreni ex
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ſententią
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VVendeli
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ni
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LXXXIV
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Tenteatur
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innestigatio
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leuitatis i
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gnis.
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>Nollem tamen, Guldine, eam tantùm̨
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igni leuitatem tribueres, quam aëri ignito
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intrà Æolipilam candentem conuenire ob
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ſeruaui: longè enim maiore leuitate prædi
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tam ignis ſubſtantiam ſtatuere æquum vide
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tur, quàm ſit leuitas aëris per vim à calorę
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extrinſecùs adueniente rarefacti. </
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>Nam cum
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aquæ intrà Æolipilam exſuctæ pondus fue
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rit granorum 5425, facilè reperiemus illius
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ſoliditatem; in pede ſiquidem cubico ſunt
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digiti ſolidi 4096: Et quia pes cubicus aquæ
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habet in pondere lib. Rom. 80, quarum ſin
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gulæ ſunt vnc. </
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>12, hoc eſt gran. 6912, to
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tius pedis cubici aquæ pondus eſt gran.
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552960. Si igitur grana 552960 dant digi
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tos ſolidos 4096, grana 5425 dabunt di
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gitos ſolidos (40 5/27). Quis autem ſubſtantiæ
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ignis habenti in mole 40 & eo amplius digi
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tos ſolidos, non facilè tribuat longiſsimè </
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