Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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<
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SECTIO QUINTA.</
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">De motu aquarum ex vaſis conſtanter plenis.</
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<
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">VAſa plena ſervantur, cum continue totidem affunduntur aquæ,
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quot effluunt; </
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<
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">affuſio autem eſſe poteſt vel in eadem cum mo-
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tus ſuperficiei aqueæ directione eademque ſingulis momentis
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velocitate, quaſi ſcilicet nova continue crearetur ſuperficies,
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cui velocitas aquæ proximæ jam inſit, vel lateralis & </
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<
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">ſine im-
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petu, veluti ſi ſuperficies, quæ continue nova creari fingitur, nullo motu
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prædita ſit & </
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<
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">demum ab aqua inferiore ad motum cienda. </
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<
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dendi novas aquas, qui infiniti ſunt, modos præteribo.</
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<
s
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">Regula interim circa hunc motum, præſertim poſteriorem, recepta eſt,
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aquam effluere velocitate conveniente altitudini ſuperficiei ſupra lumen: </
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<
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cile tamen eſt prævidere illam valere non poſſe, niſi pro vaſe ubique infini-
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te amplo, in reliquis autem fore, ut motus à quiete incipiens ſenſim ſenſim-
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que per aliqua temporis intervalla augeatur, & </
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<
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pus omnem velocitatem acquirat. </
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<
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">Attamen, ſi dicendum, quod res eſt,
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fiunt iſtæ accelerationes plerunque tam celeriter, ut minimo tempusculo tan-
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tum non tota velocitas adſit: </
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<
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">Verum res ſecus ſe habet in prælongis aquæ
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ductibus, in quibus velocitatum augmenta oculos non effugiunt & </
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diſtinctis menſuris obſervari poſſunt.</
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<
s
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">Quicquid autem ejus rei ſit, cum nullibi diſplicere poſſit accuratio
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mathematica, conſtitui motum aquarum à principio ad quemvis datum ter-
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minum conſiderare & </
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<
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reduci patiuntur 1⁰. </
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<
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Harum æquationum ſi una habeatur reliquæ inde ſua ſponte fluunt.</
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