Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO QUARTA.
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E H obſervavi effluente aqua per N M, ſimulque amplitudinem jactus exa-
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minavi.</
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<
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">Duo hæc vidi, quæ prima fronte ſibi contradicere fere videntur; </
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<
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ſcenſus ex C D in E H tardior factus eſt quam in præcedenti experimento
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fuerat, & </
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<
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">& </
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<
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xml:space
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">tamen amplior fuit jactus P Q pro ea-
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dem altitudine o P; </
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<
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">Ambo Phænomena ita explico: </
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<
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">ob foramen e, quod fuit factum prope
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G F quodque aëri liberum tranſitum concedit, ſolvitur nexus, quem alias
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inter ſe habent aquæ in tubo, nec proin aliter transfluunt aquæ ubi eſt fo-
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raminulum e, quam ſi eo ipſo in loco eſſet reſciſſus tubus; </
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<
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">fluerent autem
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tardius, quod paſſim demonſtravi, ſi tubus G N M F ceu divergens brevior
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fieret. </
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">Quod porro aquæ quamvis minori quantitate, tamen majori impetu per
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orificium N M non mutatum fluere poſſint ſine implicita contradictione, ra-
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tio eſt permixtio aëris cum aqua; </
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<
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">nam aër perpetuo irruit in tubum per fo-
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raminulum e & </
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">Denique phænomenon illud,
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quod aquæ actu celerius fluant per M N aperto, quam clauſo foramine e,
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aliter explicari non poſſe mihi videtur, quam quod impedimenta extrinſeca
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minus agant in aquam aëre rarefactam quam naturalem.</
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">Ad theoriam aquarum, quæ ex vaſis ampliſsi-
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mis à puncto quietis usque ad datum veloci-
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tatis gradum effluunt.</
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<
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">Quum aquæ per foramen in lamina tenui factum ex vaſe ampliſſimo
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effluunt, prima ſtatim guttula omni velocitate, quæ altitudini aquæ ſupra fo-
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ramen debetur, erumpit.</
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<
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<
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infinitum, & </
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<
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">quamvis etiam non fuerit ſenſu Geometrico infinitum,
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dummodo ſit valde amplum, nulla pariter guttula ab initio fluxus ob-
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ſervari poteſt, quæ non maxima velocitate effluxerit: </
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explicui §. </
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cenſito vix una aut duæ guttulæ ſenſibiliter à jactu maximo deficere </
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