Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO OCTAVA.
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non differt â priori niſi in eo, quod in ima parte cylindro A B C tubus hori-
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zontalis M D inſertus ſit perforatus lumine D, per quod aquæ verticaliter exi-
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liunt: </
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<
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">Diaphragma vero E F in medio perforatum eſt lumine G ut antea: </
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fra illud parvulum erat foramen K, ut facilius cavitas inferior aquis impleri poſ-
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ſet, quo facto idem obturabatur, reliquumque vaſis replebatur.</
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<
s
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">His ita præparatis, effluentibusque aquis per D, obſervavit Mariottus,
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mox illas aſcendiſſe uſque in I, deinde ſenſim imminuta velocitate uſque in
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N & </
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<
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">tandem, imminente depletione tota cavitatis ſuperioris, A B F E uſque
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in O, tuncque aſſumtis confeſtim novis viribus aſſiliviſſe fere uſque in F. </
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<
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vertit etiam, ſi bene memini, altitudinem jactus initialis eo minorem eſſe, quo mi-
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nus ſit foramen G, ratione alterius D. </
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<
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<
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">de motu aquarum part. </
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">Putat autem horum motuum mutationes explicari poſſe fingendo vaſi
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A B F E ampliſſimo tubum ſtrictiorem adhærere G L M D, per quem aquæ fluant. </
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At vero demonſtravimus & </
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">experientia quotidie docet, motum aquarum ex
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vaſe A B G L M D admodum diverſum eſſe ab eo, qui modo indicatus fuit. </
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Non minus falleretur ſi quis putaret aquam eadem velocitate exilire per fora-
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men D, quaſi illud in diaphragmate E F poſitum eſſet, nam fieri poteſt, ut
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altitudo jactus initialis ſit major & </
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<
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aquæ quantitate, uti facile quis ſuſpicari poſſet, qua eodem tempore effluerent
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ex vaſe ſuperiori ſimplici reſciſſa parte E F D C quamvis ita proxime ſe res ha-
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beat, cum foramen G admodum minus eſt foramine D.</
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">Noſtra vero æquatio, nempe v = {mmx/nn + mm}, recte omnino
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reſpondet phænomenis: </
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<
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">indicat enim aquam mox ab initio fluxus ad certam aſ-
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cendere altitudinem, eamque tanto minorem, quanto minus eſt foramen
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diaphragmatis p@æ foramine altero; </
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">dein iſtum aſcenſum ſenſim diminui, do-
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nec aqua omnis ex cavitate ſuperiori effluxerit, quo ipſo momento protinus
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augmentum capit, totamque aquæ ſuperincumbentis altitudinem tantum non
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attingit, quia tunc ex vaſe ſimplici eoque infinite amplo effluere cenſendæ ſunt
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aquæ: </
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<
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men G, & </
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">ſane notabiliter retardantur, cum foramen ſuperius valde parvum
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eſt, de quo argumento mox quædam dicemus, cum de fluidis heterogeneis
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ſermo erit. </
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">Si figura Mariotti debita proportione reſpondeat argumento in-
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ſtituto, oportet, ut foramen G alterius fecerit paullo pluſqnam dimidium.</
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