Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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HYDRODYNAMICÆ
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tantum ſupra aquam, cui tubus immergitur, quantum infra eandem de-
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preſſa fuerat, niſi cum tubus totus eſt apertus: </
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<
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">iſta vero ſuperficies multo
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minus deprimitur quam antea fuerat elevata. </
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<
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xml:space
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">Horum rationem dedimus in
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ſuperiori ſectione: </
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<
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xml:space
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">Hæc quia ita ſunt, regulas nunc dabo duas pro motu
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aquarum ubique definiendo, easque porro exemplis illuſtrabo talibus, quæ
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nulla adhuc theoria explicari potuerunt, cum noſtra autem egregie admo-
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dum conveniunt.</
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<
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">Regula 1.</
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xml:space
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">Diſpiciendum eſt, aſſumta alicubi in vaſe propoſito velocitate
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fluidi ceu cognita, quænam reliquis fluidi partibus futura ſit velocitas. </
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<
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enim cognoſcetur aſcenſus potentialis totius fluidi ejusque incrementum. </
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<
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">Ha-
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ctenus conſideravimus fluida in infinita ſtrata parallela vel potius ad latera
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vaſis ubique perpendicularia diviſa, ſtatuimusque velocitates hiſce ſtratis re-
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ciproce proportionales: </
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<
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tur fluida; </
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">crediderim autem his in locis motum notabilem nunquam ha-
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bere fluida ita, ut error ex iſta hypotheſi ſenſibilis naſci fere non poſſit:
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</
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<
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">poterit tamen majoris accurationis ergo præfata regula adhiberi. </
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">Præſertim
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vero huc pertinet contractio venarum, cum fluida per foramina in tenuibus
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admodum laminis facta transire coguntur, qua in re magna eſt adhibenda
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circumſpectio: </
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">Effectus hujusmodi contractionum haud male, puto, prævi-
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debuntur, cum recte perpenſa fuerint, quæ in ſectione quarta de illis monui.</
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<
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">Singulis momentis diſpiciendum eſt, quantum vis vivæ, ſeu
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quodnam productum ex aſcenſu potentiali in maſſam oriatur ad fluxum præ-
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cipuum, cujus natura quæritur, nihil conferens. </
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jusque circumſpectæ æſtimationi relinquendum eſt. </
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">Quod ſic oritur, ad-
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dendum eſt facto ex aſcenſu potentiali, quem motus præcipuus involvit, in
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maſſam, aggregatumque productorum demum æquale cenſendum eſt facto
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ex maſsâ omnis aquæ in ejusdem deſcenſum actualem.</
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">ut puto, fere unica ad mo-
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tuum menſuras obtinendas, quiin vaſis irregularibus, pluribusque cavitatibus
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inter ſe communicantibus diviſis fiunt, quod nunc pluribus illuſtrabo exemplis.</
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