Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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currat in aqua, nihilominùs retrocedet reſpectu ſpa
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tij mundani, ſed curſu magis tardo, & lento, quàm̨
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flumen mouetur. </
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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. LXXXVII.
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Alia ratione poſitiuam leuitatem non dari
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oſtenditur.
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infernè perforato in B intelligantur demerſi glo
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buli aerei, ſed perpendiculariter imminentes ſuper
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infimum foramen B, ſcilicèt intra cylindrum aqueum
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DBE, qui ad modum fluminis intra
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aquam vaſis repleti defluit egre
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diturque per foramen B. </
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namus maiori celeritate, ſcilicèt
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dupla, aquam fluere à D vſque ad
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B, quàm globus aereus G mouea
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tur ſur sùm translatus à naturali eius
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leuitate, itaut, quando aqua prædi
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cti cylindri fluentis
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ſpatium
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GI debeat aereus globus G ſursùm impelli, &
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ſigere</
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ſpatium æquale IH ſubduplum ipſius GI, eo
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quod medium fluidum in quo globus aereus G
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non eſt ſtabile, ſed deorsùm defluit, non ſecùs ac
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flumen, igitur quando aqua ſpatium GI tranſegerit,
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globus aereus contrario curſu medietatem itineris
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IH perficiet, qua proptèr ex hiſce duabus contrarijs
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velocitatibus reſultabit tertia quędam celeritas, quæ </
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