Casati, Paolo, Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae

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                <pb xlink:href="018/01/155.jpg" pagenum="141"/>
              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. </s>
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              <s>
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              Gal.
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              Aëris, & ignis copiam in terrâ de­
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                <arrow.to.target n="note69"/>
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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. </s>
              <s>Quamuis autem
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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. </s>
              <s>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. </s>
              <s>Et quidem ſubiit ani­
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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
                <expan abbr="cõmunem">communem</expan>
              phialæ incluſum ex­
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              penderem; vt exploratâ deinde eiuſdem </s>
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