Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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<
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">HYDRODYNAMICÆ</
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SECTIO TERTIA.</
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">De velocitatibus fluidorum ex vaſe utcumque for-
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mato per lumen qualecunque effluentium.</
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tentemus, ruminabimur quod in Sectione prima §. </
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<
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">à nobis allatum fuit de principiis ad hoc adhi-
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bendis.</
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<
s
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">Recordabimur nempe aſcenſum potentialem Syſtematis, cujus ſingulæ
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partes velocitate qualicunque moventur, ſignificare altitudinem verticalem,
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ad quam centrum gravitatis illius Syſtematis pervenit, ſi ſingulæ particulæ
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motu ſurſu@ converſo ſua velocitate, quantum poſſunt, aſcendere intelli-
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gantur, & </
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<
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">deſcenſum actualem denotare altitudinem verticalem, per quam
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centrum gravitatis deſcendit, poſtquam ſingulæ particulæ in quiete fuerant.
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<
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">Tum etiam memores erimus neceſſario aſcenſum potentialem æqualem eſſe
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deſcenſui actuali, quando omnis motus in materia ſubſtrata hæret, nihilque
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de eo in materiam inſenſibilem aut aliam ad ſyſtema non pertinentem tran-
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ſit, & </
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<
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">denique motum fluidorum talem proxime eſſe, ut ubique veloci-
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tas reciproce ſit proportionalis amplitudini vaſis reſpondenti, quâ de re ſuo
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loco alia quædam interjiciemus. </
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poſitionem.</
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">Si aqua per canalem utcunque formatum fluat, ejusque ve-
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locitas cognita ſit aliquo in loco, invenire aſcenſum potentialem omnis aquæ
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in canali contentæ.</
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