Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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particularum fluidi non incidant in aſperitates ſuper
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ficiei vaſis, vel fluidi quieſcentis, vnde ſubſequitur
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confricatio, & repercuſſio partium fluidi per totam̨
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longitudinem canalis AD; & hac de cauſa impetus
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fluentis aquæ tranfuerſali motu retardatur extenſiuè,
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& intenſiuè; & quoad extenſionem pertinet, patet
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quòd quam proportionem habet ſuperficies interna
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vaſis AD ad ſuperficiem PS, eamdem habebit impe
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dimentum retardans impetum fluidi AND ad impe
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dimentum impetus fluidi P 3 S, & habet AD ad PS
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proportionem eius, quam habet impetus
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aquæ fluentis AND ad impetum fluentis aquæ P 3 S.
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verùm quoad intenſionem, patet quòd machinulæ
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ambientes particulas fluidorum magis flectuntur, &
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vehementiùs diſtrahuntur, quando maiori vi intra ali
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as denſas, vel fluidas particulas agitantur, & propte
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rea multò magis eorum impetus retardatur; Hinc fit
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vt maior naturalis vis motiua libræ GH & ideò impe
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tus aquæ fluentis AND magis, & intenſiuè retarde
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tur quàm naturalis languidior impetus aquæ P 3 S, &
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propterea oleum EF nedùm celeriùs non aſcendet,
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quàm oleum KY, ſed præterea neceſſe eſt (vt docet ex
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perientia) vt aliquantiſper tardius, quàm illud eleue
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tur. </
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claratis deuenio ad Propoſitionem principalem. </
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Cap. 11. gra
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uia in fluido
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velocitati
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bus inæqua
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libus ferri
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debere.</
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Prop. 233.</
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Cap. 11. gra
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uia in fluido
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velocitati
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bus inæqua
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libus ferri
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debere.</
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PROP. CCXXXV.
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Si fuerint duo cylindri homogenei, æquè alti, quorum baſes
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inæquales, cylinder ſtrictior aliquantùm celerius
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aſcẽdet
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,
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vel deſcendet, quàm latior.
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