Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO DECIMA.
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log.</
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xml:space
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">{[√x - √(x - δ)] x [√D + √(D - δ)]/[√x + √(x - δ)] X [√D - √(D - δ)]} = {2n√As/L}</
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<
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<
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<
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xml:space
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xml:space
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">Omnis effluxus fit tempore finito quâ in re iſta quæſtio ab alte-
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ra præcedente differt: </
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<
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xml:space
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">Ceſſat autem aër effluere, cum eſt x = δ, & </
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<
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n = {L/2√As} X log. </
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<
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xml:space
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">{√D + √(D - δ)/√D - √(D - δ)}.</
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<
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">A = 26000 ped. </
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<
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">contineat vas propoſitum unum pedem
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cubicum, foramen autèm habeat amplitudinem unius lineæ quadratæ, erit
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L = 20736; </
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<
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">ponatur inſuper aërem intèrnum ab initio duplo fuiſſe den-
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ſiorem externo; </
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<
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">eſt autem ut conſtat s = 15 {1/12} ped. </
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n = {20736√3/√(181.</
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<
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xml:space
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">26000)} log. </
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<
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xml:space
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">{√2 + 1/√2 - 1} = 29, 2,
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quod ſignificat aërem utrumque ad æquilibrium compoſitum iri tempore
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paullo majori quam viginti novem minutorum ſecundorum, poſt idque
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omnem effluxum ceſſaturum. </
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">Fieri autèm poteſt à contractione, quam flui-
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da præ foramine patiuntur (vid. </
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<
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puto attentionem, ut tempus iſtud augeatur fere in in ratione ut 1 ad √ 2.</
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<
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<
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<
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">Si fingatur aërem non immediate per foramen effluere, ſed
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per longum tubum, non mutabitur propterea velocitas, ſi modo totius tubi
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capacitas ſit veluti infinite parva ratione capacitatis, quæ in vaſe ipſo eſt;
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</
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<
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">Videtur autem denſitatem aëris, quamdiu in tubo eſt, eandem eſſe cum denſitate
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aëris vaſi incluſi, nectamen, quod demonſtrabo inferius, elaſticitas aëris in tubo
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major eſt elaſticitate aëris externi, qui tubum circumdat. </
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<
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eſt, ventum aërem eſſe denſiorem aëre quieſcente, ſed non magis elaſticum: </
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attamen denſitatum differentia parvula quoque erit; </
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<
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30. </
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& </
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<
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">quietum, vix una milleſima ſeptingentiſſima parte denſitate ſuperabit.</
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<
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<
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<
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<
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">Definire influxum aëris per foramen valde parvum in vas aëre
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rariore plenum, poſito rurſus utrobique eodem caloris gradu.</
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