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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">Ut appareat, non differre valorem iſtius potentiæ ab illa, quam
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pro globo ejusdem ponderis p invenimus articulo V. </
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<
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xml:space
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">nempe {m N p/M}, demon-
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ſtranda eſt æqualitas inter {n p (g - f)/Mc} & </
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<
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">{m N p/M} ſeu inter n (g - f) & </
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<
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">m N c: </
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<
s
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">iſta
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vero æqualitas deducenda eſt ex eo, quod extremitates aquæ l & </
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<
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xml:space
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">o in eadem
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ab horizonte altitudine poſitæ ſint; </
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<
s
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xml:space
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">inde enim ſequitur, ut demonſtravi-
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mus art. </
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<
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">IV. </
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<
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">eſſe aggregatum ex arcu a c multiplicato per {m N/M} & </
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<
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">ex linea M d
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multiplicata per n = aggregato ex arcu a c M p pariter multiplicato per {m N/M}
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& </
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<
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xml:space
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">ex linea M q multiplicata per n. </
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<
s
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xml:space
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">Adhibitis itaque denominationibus præ-
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cedentis articuli, fit M e X {m N/M} + (2 - f) X n = (M e + M c) X {m N/M} +
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(2 - g) X n, vel n (g - f) = m N c; </
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<
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xml:space
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">quæ æqualitas demonſtranda erat ad
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demonſtrandam æqualitatem potentiarum tum pro globo tum pro aqua in
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f applicandarum.</
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</
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">Scholium 2.</
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<
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xml:space
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">(XIV) Quia potentia {n p (g - f)/M c} non differt ab {m N p/M} & </
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<
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">quantitas {m N/M}
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eadem manet, quæcunque aquæ quantitas una revolutione hauriatur aut eji-
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ciatur, erit potentia iſta proportionalis eidem quantitati aquæ ſingulis revolu-
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tionibus ejectæ ſeu ponderi p. </
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<
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">Facile quoque demonſtratu eſt, ſi eadem aqua-
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rum quantitas, eadem potentia movente eademque velocitate ad parem altitudi-
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nem verticalem elevetur ſuper ſimplici plano, quod ad hunc finem debite ver-
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ſus horizontem inclinatum ſit, fore ut tempus elevationis quoque idem ſit.</
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<
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">Igitur eadem potentia abſoluta requiritur in cochlea Archimedis, quam
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ſuper plano inclinato, ad quod omnes machinæ reduci poſſunt, nec ullam
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habet iſta cochlea prærogativam præ reliquis machinis in theoria ſpectatis.
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<
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<
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improbo ejus uſum, ſed nec eam præfero præ antliis Cteſibianis.</
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