Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO TERTIA,
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<
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style
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xml:space
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">De velocitate aquæ ex vaſe ampliſſimo
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erumpentis.</
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<
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xml:space
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<
s
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xml:space
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">IN iſto paragrapho dicimus, ſi vas ſit ampliſſimum, aquam mox, poſt-
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quam ſuperficies interna aliquantulum deſcendit, erumpere velocitate,
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quæ conſtanter reſpondeat altitudini aquæ ſupra foramen. </
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<
s
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xml:space
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">Sinas autem
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ſub quâcunque directione (neque enim in vaſis ampliſſimis directio venæ
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quicquam velocitatem mutare poteſt) aquam effluere, & </
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<
s
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xml:space
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">obſerves quocun-
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que temporis puncto, in quanta diſtantia ab verticali vena in horizontem
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impingat, & </
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>
<
s
xml:id
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xml:space
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">exinde per præmiſſam regulam quære altitudinem velocitati
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aquæ effluentis eo temporis puncto reſpondentem, ſic ſemper iſtam altitu-
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dinem invenies æqualem altitudini aquæ ſupra centrum foraminis, ſi modo
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excipias primas guttulas, quæ vi §. </
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<
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<
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actu effluunt: </
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<
s
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xml:space
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">Neque impedimenta, quorum ſæpius mentionem injecimus,
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ullam notabilem moram fluxui injicient, ſi modo diameter foraminis duas
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aut tres lineas minimum exæquet, & </
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>
<
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xml:space
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">diameter ipſius vaſis non ſit infra ali-
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quot pollices, & </
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<
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">denique altitudo aquæ nimia non ſit, veluti plurium pedum.</
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<
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</
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<
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<
s
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xml:space
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">Hæc omnia ſæpe expertus ſum, experimenti autem genus nimis eſt tri-
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viale, quam ut prolixe deſcribi mereatur.</
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<
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">De vaſis quæ ſunt Tubis verticalibus inſtructa.</
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<
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">Ad §. 22. & 23.</
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<
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repetii; </
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<
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">ea vero quæ ad rem præſentem faciunt huc potiſſimum re-
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deunt.</
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<
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<
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<
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24. 25.
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& 26.</
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inter ſe æquales, ſolâ B exiſtente paullo majore in ratione ut 16 ad 25, am-
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plitudines quoque, ut & </
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<
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timo, cujus longitudo quadrupla eſt: </
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<
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">tubi autem duobus cylindris interme-
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diis annexi, triplam habent longitudinem cylindrorum. </
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<
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aqua repletis de ejus effluxu obſervatum fuit.</
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Fig. </
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<
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