Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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010/01/199.jpg
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tiam corpoream, & plenam, vt nimirum maius
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ſpatium occupet, & in hoc caſu comparari debent
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ſpatia occupata, ſiuè moles æquales inter ſe, &
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medio fluido in quo leuitant, vt ſi fuerint duæ pilæ
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æquales, vna aquea, altera aerea intra
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mercuriũ
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de
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merſę, dicetur maior leuitas intenſiuè aeris reſpectu
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leuitatis aquæ, & leuitates eamdem proportionem
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habebunt, quàm raritates molium æquallum aeris,
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& aquę in mercurio conſideratæ habent. </
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dentia ſenſus ſuadet, ſi enim intra hydrargyrum de
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mergatur ampulla vitrea plumbo repleta, huius qui
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dem gradus leuitatis menſuratur à vi
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cõntraria
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, quæ
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aſcenſum eius in mercurio prohibere poteſt, ſitque
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talis vis contraria pondus duarum vnciarum ſuper
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poſitum, & intra mercutium fixè detinens
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natantẽ
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ampullam. </
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læ ſubtrahatur, patet quod
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præcisè totius am
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pullæ raritas aucta erit, quantum diminuta fuit ſub
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ſtantia corporea ponderoſa intra ampullam eiuſdem
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molis, & figuræ contenta, & tunc gradus leuitatis
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præcisè augebitur vna vncia, nam ſi velimus
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eiuſdem ampullæ prohibere ſuperponi debent non
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duæ vt priùs, ſed tres vnciæ, poſtea ſi ampullæ rari
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tas denuò augeatur detracta altera
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plũbi
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vncia, gra
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dus quoque leuitatis eadem menſura creſcet vt ni
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mirùm requirantur quatuor vnciæ ad prohibendum
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eius aſcenſum è mercurio, idemque verificatur ſi
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vlterius pondus internum ampullæ diminuatur; qua
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re incrementa leuitatis proportionalia ſunt incre-</
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