Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſe ſumptum, tamen ſi grauitas ſpecifica conſidere
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tur, erit aggregatum ex oleo, & aere minùs graue,
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quàm oleum ſolum, quia nempè pondus aggregati
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ex oleo & aere, minorem proportionem habet ad
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grauitatem molis aqueæ ei æqualis, quàm pondus
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ſolius olei habeat ad
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grauitatẽ
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aquæ molis prædicto
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oleo æqualis, ſcilicèt ſi aggregati ex oleo, & aere
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grauitas ſubdupla fuerit pondere molis aquæ ſibi æ
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qualis, pondus olei ſolius maius erit medietate
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põ-deris
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deris</
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molis aquæ oleo æqualis, & hinc ſit vt maiori
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impetu ſursùm per expreſſionem impellatur aggre
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gatum ex oleo & aere à ſuperabundanti grauitate
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aquæ circumfuſæ, quæ maiori differentia ſpecificam
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grauitatem eius ſuperat, quàm moueatur oleum ſur
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sùm extruſum à pondere minùs excedenti eiuſdem̨
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aquæ ambientis. </
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<
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tollentur, & euaneſcent omnes difficultates, quæ
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contra prædictam doctrinam afferri poſſunt. </
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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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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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<
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">Præter ea, quæ iam dicta ſunt affert idem author
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alia experimenta ex quibus putat euidentèr deduci
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poſſe exiſtentiam leuitatis poſitiuæ, quia inquit:
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Cylindrus ligneus è fundo aquæ ſursùm tanto impetu fertur
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vt multotiès exiliat totus ſupra aquam ille igitur ſaltus in
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dicium eſt impetus ab intrinſeca leuitate facti, quia aqua
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non poteſt illud vltrà trudere quam ſit ipſi opus vt locum
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inferiorem occupet niſi ipſa ſursùm priùs feratur, quod eſt
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contra ipſius grauitatem.
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