Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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cipiet leuitas non contemnendum; cum po
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tiſſimùm ex globi totius grauitate demen
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dum ſit huius aquæ terram circumplectentis
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pondus: iam enim non pars eſſet oneris mo
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uendi, ſed eſſet medium, in quo motus per
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ficeretur. </
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Gal.
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Aëris, & ignis copiam in terrâ de
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liteſcentem certis menſuris definire non poſ
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ſumus, ſed coniecturas tantùm perſequi ne
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ceſſe eſt: illud potius à Philoſopho exigi poſ
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ſe videtur, vt aëris grauitatem cum aquâ
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comparatam determinet. </
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<
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conſtipato intrà vas aëre aliquando depre
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henderim aërem quadringenties aquâ leuio
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rem, mihi tamen omninò non ſatis facio: ex
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illo enim experimento hoc certè euincitur,
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quod aër conſtipatus in aere communi non
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conſtipato grauitat: ſed cum varia ſit aëris
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conſtipatio, inconſtans pariter eſt grauitatis
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menſura, quæ ex illâ colligitur. </
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<
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>Quare aëris
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grauitatem explorare oporteret in medio le
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uiore, quemadmodum aqua non intrà aquam
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ſed in aëre expenditur. </
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<
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mum aliquando hæc cogitatio, vt ſubiectis
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pruni aërem vehementer calefacerem, in
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quo aërem
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phialæ incluſum ex
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penderem; vt exploratâ deinde eiuſdem </
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