Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO NONA.
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<
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<
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<
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xml:space
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">Non deſunt qui putent machinam excogitari poſſe, cujus ope
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minimo labore maxima aquæ quantitas ad quamcunque altitudinem elevari
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poſſit, animumque excrucient, in anquirendis rotis, vectibus, ponderibus
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appendendis: </
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<
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xml:space
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">ſed operam perdunt, neque audiendi ſunt hujuſmodi promiſſo-
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res, cum magni quid ſibi videntur inveniſſe: </
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<
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">Optima machina eſt, ſi ſolum
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ejus effectum reſpiciamus, quæ minimas patitur frictiones, nullosque gene-
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rat motus inutiles, de quo utroque evitando præcepta trademus infrà,</
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<
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<
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<
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xml:space
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">repræſentantur, in quibus ſu-
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perficies aquæ interna A B in eadem propemodum altitudine eſt cum foramine
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F, ſunt potentiæ abſolutæ pro iiſdem temporibus in triplicata ratione velocita-
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tum aquarum exilientium.</
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<
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">Sunt enim potentiæ moventes in duplicata ratione velocitatum, quibus
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aquæ per foramen F erumpunt & </
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<
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ipſam rationem velocitatum aquarum exilientium: </
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ſunt potentiæ abſolutæ ut potentiæ moventes multiplicatæ per ſuas velocitates,
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ergo patet propoſitio.</
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<
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<
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altitudinem F G elevare, magnam potentiæ abſolutæ partem ſine fructu perdi,
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cum aquæ majori impetu erumpunt, quam quæ altitudini F G reſpondeat;
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</
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<
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">fac enim aquas dupla velocitate expelli, requiretur potentia abſoluta octupla,
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neque tamen ratione finis propoſiti effectus plus quam duplus eſt cenſendus,
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quia nempe eodem tempore dupla aquarum quantitas elevatur: </
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iſte effectus obtineri potentia abſoluta ſubquadrupla exprimendo aquas ſimplici
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velocitate per foramen duplum; </
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<
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">Hoc igitur nomine tres quartæ partes iſtius
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potentiæ inutiliter impenſæ dicendæ ſunt. </
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§. </
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<
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