Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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HYDRODYNAMICÆ
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quantum & </
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">eorum quidem in ipſo opere
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plurima occurrent, quæ autem ob calculum, quem poſtulant, non allegabo.
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</
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<
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">Triviale autem & </
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">obvium eſt, quod de gutta, in aquam ſtagnantem delapſa,
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obſervatur: </
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<
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">orbes nempe excitat in ſuperficie aquæ ſtagnantis, horumque eo
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plures, quo vel major fuerit gutta, vel altius delapſa, nec dubium eſt, quin
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iſti orbes ſine fine ſe propagaturi eſſent, niſi tenacitas fluidi, aliaque ſimilia
<
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obſtaculo eſſent. </
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<
s
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">Quandoque etiam alium effectum ab hujusmodi ſtillis ob-
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ſervare licet, dum plures guttulæ minores a ſuperficie aquæ inferioris in al-
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tum projiciuntur, tuncque conſtanter apparet, quod præſertim huc pertinet,
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eo altius aſſurgere guttulas, quo pauciores numero atque minores volumine
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fuerint, & </
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<
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">cum altitudo lapſus eſſet duorum pedum, ſæpius guttulæ minores
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ultra altitudinem lapſus aſcendebant, ſtillante præſertim aqua per foramen
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magnum. </
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<
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">Hic notatu quoque dignum eſt illud, quod de particula aquæ per
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canalem tenuem, eumque v. </
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">horizontalem, atque in ea extremitate, ver-
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ſus quam aqua fluit, operculo perforato opertum obſervatur. </
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<
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">Scilicet eo
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temporis puncto, quo aqua ad operculum usque pervenit, magno impetu
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paucæ guttulæ exiliunt, moxque omnis aquæ motus ſiſtitur; </
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<
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">facile autem quis
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ſuſpicari poſſet, aquam foramini imminentem ſua velocitate moveri pergere,
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reliquam ſiſti, id vero conſervationi virium vivarum minime reſponderet; </
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<
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ſpondet autem egregie vehemens iſte aquæ effluxus momentaneus, vel quaſi
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exploſio: </
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<
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">de his alibi plura.</
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<
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">Hæc ſunt, quæ de hypotheſibus noſtris, earumque tum præſtan-
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tia tum defectu volui in anteceſſum monere. </
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<
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">Supereſt ut quædam dicam de
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indole fluidorum, quippe circa quæ lucubrationes noſtræ verſabuntur, non
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quod eam me aliis magis perſpectam habere putem, ſed quod nefas exiſti-
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mem, a more hoc ſcriptoribus omnibus ſolenni recedere. </
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<
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">Et primo quidem
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hoc omnes convenire ſolent, motum fluidis quibusvis ineſſe inteſtinum, ſine
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quo nemo profecto tantam fluiditatem, efferveſcentias diverſorum fluidorum,
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diſſolutiones ſolidorum fluidis ſubmerſorum, evaporationes, aliaque phæno-
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mena infinita recte aſſequetur; </
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<
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">hinc pleræque res ſolidiſſimæ a ſufficiente ca-
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lore, qui omnia in motum rapit, liqueſcunt: </
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<
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">facit autem motus iſte inteſti-
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nus, ut particulæ ſibi non ſint contiguæ, ſed quaſi volitent, quo fit, ut ſine
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frictione a minimo impulſu loco cedant, quod minime ſuccederet, poſitis
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iisdem particulis inter ſe, ſicut in acervo arenæ, contiguis. </
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