Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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quidnam admiſſo, vel negato prædicto peripatetico
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aſmpto ſubſequatur. </
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. LIX.
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Aliter id ipſum ostendere, poſito, quòd aer vi leuitatis per
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diuerſa media fluida aſcendat.
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<
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">SIt igitur idem mobile B, quod ſit lignum leuiſſi
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mum, vel veſica aere plena, impellaturque vſque
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ad fundum vaſis DCFE cuius medietas infima reple
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atur aqua A, reliqua medietas ſuprema O repleatur
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oleo, vel ſpiritu vini, & ponamus leuitatem aereæ
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veſicæ B eſſe trium graduum, & leuitatem ſpiritus
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vini duorum graduum, at leuitatem aquæ magis
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eſſe vnius gradus. </
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<
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">Manifeſtum eſt, quòd reſiſten
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tia aquæ A, & partium tenacitas, quæ penetrari de
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bet à ligno, vel veſica B dùm ſursùm aſcendit, erit
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tò</
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maior reſiſtentia ſpiritus vi
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ni O quantùm illa eſt magis
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ſa</
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, & conſtipata quàm iſte, ſci
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licèt ſi
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moles æquales
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eorumdem fluidorum, quantò
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maior eſt corpulentia, & mate
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ria, quæ prędictum aqueum ſpa
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tium replet ea materia quæ molem ſpiritus vini oc
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cupat, & quia
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leuitatẽ
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ſpiritus vini ad
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leuitatẽ
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aquæ
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eamdem proportionem habere aiunt, quam illius
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raritas ad huius raritatem, igitur tantò magis diſtra
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hibilis, & minùs reſiſtens erit ſpiritus vini, quàm̨ </
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