Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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HYDRODYNAMICÆ
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get vas ſuâ velocitate moveri, ſuperficies autem aquæ declivitatem deponet,
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rurſusque ad ſitum horizontalem componetur, veluti ſi quieſcat vas; </
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<
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">in his
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adeoque caſibus non eſt vaſis motus, qui fluidorum ſtatum permutet, ſed
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motus variatio.</
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<
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xml:space
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verticaliter poſito facile extenditur ad vas cujuscunque figuræ: </
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<
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xml:space
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">qualis enim
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eſt inclinatio ſuperficiei aqueæ A B ad horizontem in vaſe cylindrivo, talis
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erit in omnibus reliquis vaſis: </
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<
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">preſſio autem aquæ in latera vaſis ubique de-
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finietur, ſi columna concipiatur verticalis ab eo puncto, pro quo preſſio
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aquæ definienda eſt, usque ad ſuperficiem aquæ, quæ cogitatione producen-
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da erit, ſi id opus fuerit. </
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<
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te inflexus, veluti A C D L (Fig. </
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<
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">69.) </
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">isque moveatur in directione C D,
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tum utraque ſuperficies M, N ſitum mutabit in A, B, donec recta A B debi-
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tam obtineat inclinationem antea definitam; </
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<
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">fieri etiam poteſt ut pars aquæ
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efflat per A, priusquam æquilibrium adſit: </
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">ſi crus D L deorſum ſpectet,
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ut in figura 70. </
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">in utroque enim caſu inclina-
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tio lineæ A B cæteris paribus eadem erit.</
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<
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">erit linea M A eo major, quo longius eſt crus ho-
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rizontale C D: </
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">ſic ut minimæ accelerationes aut etiam retardationes obſer-
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vari poſſint, quod ſæpe aliis rebus inſervire poteſt, veluti dignoſcendis ac-
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celerationibus navium, niſibusque quos exercent ſingulis remorum ſub-
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merſionibus remiges; </
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<
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">in his tamen caſibus, quia non poteſt ſtatus ſuppo-
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ni durationis ſeu permanentiæ, omnis fluidi motus, qui ſingulis vicibus re-
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plicatur, eſſet inquirendus.</
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<
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">Facit eadem hæc ratio, ut nondum liceat omnino ex præmiſſis deter-
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minare, quid fieri debeat cum vaſa fluidum continentia percutiuntur.</
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<
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">Poſſunt autem regulæ percuſſionum ex ordinariis legibus preſſionum de-
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duci, quandoquidem percuſſio nihil aliud ſit, niſi ingens preſſio parum durans.</
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<
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aqua plenus, impingatque globus P in tubi prominentiam A P: </
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ſubito premet vehementer fundum B A verſus P: </
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