Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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HYDRODYNAMICÆ
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tranſgrediatur altitudinem {mma/mm - nn}. </
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<
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xml:space
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">De his igitur caſibus nihil eſt quod di-
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camus.</
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<
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<
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<
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">Quæſtio hic nunc alia occurrit notatu digna; </
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<
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xml:space
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">nempe quis eſſe
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poſſit modus affuſionis mechanicus, ut vas ſuperius ad debitam durante toto
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fluxu altitudinem plenum ſervetur. </
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<
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xml:space
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">Difficile foret iſtud Problema ob incon-
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ſtantiam altitudinis quæſitæ, niſi peculiare hic artificium occurreret, quod
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nunc tradam.</
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<
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<
s
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">Nititur autem ſuper eo, quod aqua in ſpatio minimo RSDG nullam
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patiatur compreſſionem neque affirmativam neque negativam, quia ex hypo-
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theſi communi velocitate movetur cum aqua proxime ſubſtrata, atque ſic nul-
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la particula nullam nec propellere nec retinere tentet.</
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<
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<
s
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">Fiat igitur vas quod dixi utrumque, ſitque tubus cum vaſe ſuperiore
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firmatus (neque enim aliter quam demonſtrationis gratia illa poſuimus antea
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ſeparata) habeat autem tubus in ſummitate a (Fig. </
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<
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<
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ſpondeat tubulus a m, in hunc tubulum immittatur tubus vitreus recurvus
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a b c d g, obtectis cera oris m n: </
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<
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</
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<
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">His ſic præparatis, ſic erit faciendum, ut durante toto experimento ſummitas
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aquæ conſtanter permaneat in puncto e; </
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<
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">ad hoc requiri videbis, ut ab initio
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ſuperficies aquæ ſit fundo F P proxima, deinde, ut continue elevetur, & </
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<
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nique ut poſt tempus etſi infinitum nunquam tamen tranſcendat altitudinem
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{nna/mm - nn}, facile autem erit aquarum affuſionem ita moderari, ut ſuperficies
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à puncto e non admodum divagetur, @ſi modo circumſtantiæ non ſint ita com-
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paratæ, ut aquæ ab initio nimis celeriter ſint affundendæ.</
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<
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">Quod ſi autem ſuperficiem in tubulo ſupra e elevatam animadvertis, in-
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hibe paullo affuſionem, quod faciendum eſſe alibi demonſtrabo, ſi ſecus fuerit,
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largius aquas affunde.</
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<
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">Nihil habet difficultatis iſtud experimenti genus cujuſmodi ſæpe feci,
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ſed ne error in experimentum irrepat, examinandus eſt tubi vitrei effectus ca-
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pillaris; </
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<
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">hunc effectum invenies, ſi obturato orificio L M, priusque madefa-
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cto tubo, cylindrus aqua impleatur uſque ad ſummitatem, atque ſic invenies
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ſuperficiem aquæ in tubo pertingere uſque in f, locum nempe altiorem quam </
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