Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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HYDRODYNAMICÆ
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">EXPERIMENTA</
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">TUbum adhibui vitreum cylindricum diametri fere quatuor linearum,
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inferius totum apertum. </
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<
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">Eum aquæ, in vaſe pellucido ampliſſimo
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ſtagnanti, ſubmerſi ad altitudinem 44. </
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<
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<
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">digitumque orificio admo-
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vi ſuperno, ne extrahendo tubi partem deſcenderet in illo aqua: </
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<
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deinceps tubum ad alt. </
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<
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<
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<
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">ita ut tam pars tubi ſubmerſa, quam altitudo
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aquæ internæ@ſupra externam eſſet 22. </
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<
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<
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">moxque remoto digito obſervavi
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deſcenſum ſuperficiei in tubo infra ſuperficiem aquæ ſtagnantis eumque vidi
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fuiſſe 9 {1/2} lin,</
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<
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<
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">deſcendere tredecim lineis; </
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<
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trium linearum cum dimidia unice fere adhæſioni aquæ ad latera tubi tribuen-
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dus videtur.</
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<
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<
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">Obſervato deſcenſu totum experimentum repetii, ut aſcenſum quoque
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proximum experirer: </
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<
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<
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<
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mi ſexti, habito reſpectu ad prævium deſcenſum, eſſe debuerat 9 {1/2} lin.
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<
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unica tantum linea cum dimidia defecit, cum in prima experimenti parte ad
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tres uſque lineas cum dimidia defectus adfuit, quia nimirum major ibi facta
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fuit excurſio eaque velocitate majori, ita ut impedimenta, quæ una cum velo-
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citatibus creſcunt, admodum majora offenderit.</
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<
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">Eodem tubo uſus ſum, ſed eo lamina munito, quæ foramine erat per-
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tuſa amplitudine √ {1/2} ratione amplitudinis tubi, cum ſuperficies tubi eſſet
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octodecim lineis elevata ſupra aquam ſtagnantem, totidemque lineis fundum
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ſubmerſum, vidi ſuperficiem tubi in deſcenſu quinque fere lineis infra aquam
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ſtagnantem deſcendiſſe.</
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<
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<
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plusquam 2 {1/2} lin. </
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<
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