Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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0050
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HYDRODYNAMICÆ.
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hamus. </
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<
s
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xml:space
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">Sæpe quidem fit, ut principium iſtud non ſine limitatione adhibe-
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ri poſſit, quod in ſequentibus oſtendemus, nempe cum particulæ aquæ
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motu ſingulæ diverſo ſeruntur, quo fit ut ſingulis momentis aliquid de mo-
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tu, vel ſi mavis de aſcenſu potentiali, perdatur. </
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<
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xml:space
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">Sed in præſenti caſu nihil
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ſimile accidit, quandoquidem omnes particulæ ſimiliter fere moventur & </
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<
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præſertim, quando foramen eſt valde parvum, motus particularum inter-
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narum fere nullus eſt, nihilque adeo inde detrimenti venire poteſt. </
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<
s
xml:id
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echoid-s991
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xml:space
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">Alterum
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autem principium, quo aſſumitur velocitatem cujuslibet particulæ eam eſſe,
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quæ reſpondet inverſæ rationi amplitudinum, duplici quidem laborat in-
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comniodo, primo nempe, quod motus circa latera vaſis tardior paulo ſit
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quam in medio nec proin omnes particulæ eidem amplitudini vaſis reſpon-
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dentes, æquali velocitate ferantur, & </
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<
s
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echoid-s992
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">ſecundo, quod aqua à fundo non ad-
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modum remota motum, quem principium hoc poſtulat, habere non poſ-
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ſit: </
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<
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">Utrumque autem nullum ſenſibilem errorem poſt ſe trahit, quando in
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hoc problemate ſimplici figura vaſis interna nihil fere ad motum aquæ efflu-
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entis attineat; </
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<
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">Ex eadem ratione intelligitur non multum diverſum eſſe poſ-
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ſe motum aquæ ſub alia quacunque directione effluentis, quia ſcilicet mo-
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tus aquæ internus in ima vaſis parte tantum diverſus fit, hæcque diverſitas
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nullius momenti fere eſſe poteſt. </
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<
s
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echoid-s995
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xml:space
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preserve
">Apparet ergo hypotheſes, quibus calcu-
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lus noſtri hujus Problematis innititur, ita convenire cum natura quæſtionis,
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ut error inde nullus ſenſibus perceptibilis oriri poſſit. </
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<
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">At vero impedimen-
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ta ſupra memorata, attritus, tenacitas fluidi aliaque ſimilia majoris efficaciæ
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ſunt, præſertim cum foramen, per quod fluida exiliunt, per quam exi-
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guum, aut altitudo aquæ ſupra foramen admodum magna, aut denique
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tubus valde gracilis eſt, qua de re experimenta plurima extant apud Mariot-
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tum in tract. </
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<
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">de mot. </
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<
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">aquarum. </
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<
s
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xml:space
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">Jam vero progredior ad examinandum mo-
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tum aquarum ex vaſis Cylindricis per foramina cujuscunque magnitudinis
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effluentium. </
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<
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">Vaſa autem compendii & </
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">elegantioris ſolutionis cauſa conſi-
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derabimus verticaliter poſita.</
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