Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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HYDRODYNAMICÆ.
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D F B parvula erat, minorque etiam pars G B, quam in experimento ab aqua
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relinquebam vacuam: </
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<
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">ac denique operculum foramine non admodum parvo
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erat pertuſum. </
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<
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xml:space
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">Et tunc vidi ſaltum non multum admodum defeciſſe ab altitu-
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dine {mmδ/nnß} a, quam §. </
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<
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<
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xml:space
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">pro hoc negotio dedi, imo memini me præſenti
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Amico altitudinem ſaltus recte prædixiſſe, poſtquam perpendiſſem, quantum
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in calculo præter propter impedimentis eſſet dandum.</
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">Similem aquæ exploſionem momentaneam eamque à ſimili cauſa oriun-
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dam facillime obtinebis cum fontibus, qui aquas per fiſtulam pleno orificio eji-
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ciunt. </
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<
s
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xml:space
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">Si enim digitum orificio fiſtulæ ſubito ita apponas, ut pars orificii aper-
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ta maneat, protinus aquas magno impetu expelli videbis, moxque tenue aquæ
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filum intra priſtinos velocitatis limites reduci. </
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<
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">Obſervabis etiam aquas eò ma-
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jori impetu atque longius projici quo minus digito relinquas foramen, atque
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pro eodem relicto foramine, jactum inſolitum eò magis protrahi (utut ſemper
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breviſſimum) fierique oculis ſenſibiliorem, quo longior eſt fiſtula, ita ut in
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fontibus ſalientibus, ad quos aquæ ex caſtello per longiſſimos canales ferun-
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tur, ſi canales non eſſent admodum ampli & </
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<
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">aquæ pleno effluerent orificio,
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non dubito quin ſic per notabile temporis ſpatium vehemens aquæ jactus pro-
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trahi poſſet, gradatim ad ſolitam velocitatem rediturus: </
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mia ſunt cum iis, quæ §. </
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ni coram V. </
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monem de rebus iſtis aquariis forte delapſus eram. </
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">Quamvis autem hic nullus
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ſit aër, qui accuſari poſſit, revera tamen phænomenon iſtud ab eo, quod D.
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</
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<
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">utrumque ab eo provenit, quod
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motus aquæ in canali contentæ, vel ſaltem motus iſtius pars perire non poſſit,
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fine ullo inde proveniente effectu, quem ipſe enormis aquarum jactus con-
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ſtituit.</
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