Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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HYDRODYNAMICÆ.
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quantulum perforavi, haud procul à G, rurſusque obſervavi, paullo lentius
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deſcendere ſuperficiem internam, cujus rei me certum fecit quod numera-
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bam oſcillationes alicujus penduli, quibus ſuperficies per datum ſpatium
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deſcendit: </
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<
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xml:space
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">ratione autem aquarum effluentium vidi aliquando aquas pleno
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orificio effluere & </
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<
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xml:space
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">tunc aquas ſolito minus eſſe pellucidas, jactum autem or-
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dinarium vel ordinario paullo majorem facere; </
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<
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xml:space
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">ſæpiſſime autem aquam & </
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<
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aërem juxta ſe ferri, illam in parte tubi inferiore juxta latus F M, hunc in
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ſuperiori juxta G N & </
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<
s
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">tunc aquas eſſe limpidas atque velocitate ejici ſolito
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non ſolum haud minori, ſed & </
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<
s
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xml:space
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">multo majori, quod fieri poſſe haud obſcu-
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re prævideram. </
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<
s
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xml:space
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">De hâc re in ſequenti Sectione aliud experimentum majori
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præciſione inſtitutum apponam.</
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<
s
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xml:space
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">Dabitur autem fortaſſe alibi locus demonſtrandi aquas ſufficienti aëris
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quantitate permiſtas, ea proxime effluere copia, qua effluerent reſciſſo tu-
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bo eo in loco ubi eſt perforatus, cui rei ipſam quoque experentiam reſpon-
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dere animadverti.</
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<
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">DUcta in pariete horizontali M N (Fig. </
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">Fig. 27.</
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totum aquâ plenum, cruraque ambo inter ſe parallela habentem, ita
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poſui, ut extremitas altera B horizontalem M N raderet, ſimulque
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crura eſſent verticalia, dum interea orificium C digito obturabam aquæ ef-
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fluxum ſic compeſcens.</
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<
s
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">Dein remoto digito obſervavi, altitudinem maximam B P, ad quam
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aquæ effluentes aſcendebant, aliisque vicibus attendi ad locum E, ad quem
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deſcendit aquæ ſuperficies; </
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<
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">feci autem fub duabus diverſis circumſtantiis ex-
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perimentum; </
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">primo enim loco nullum in B poſueram operculum; </
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<
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de operculum adhibui tali lumine perforatum, quod amplitudinem haberet
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ratione amplitudinis tubi ut 1. </
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">C A
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= 345; </
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<
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">A D B = 530; </
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<
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">B P = 33; </
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">& </
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">A E = 88. </
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<
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">particulis, quarum 375
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longitudinem Pedis Lond. </
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<
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">Hæc ita fuere in caſu priori, in al-
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tero autem manentibus reliquis vidi B P = 64 & </
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<
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ſitu, quod alio explorare cupiens modo maximum deſcenſum A E, poſt fini-
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tum experimentum inclinaverim tubum, donec aqua jam jam effluxui per B </
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