Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO TERTIA.
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<
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xml:space
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inſeruntur.</
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<
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<
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xml:space
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<
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xml:space
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<
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rizontalem G M ampliorem in extremitate N M quam ortu G F fluunt,
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majori velocitate illas ferri per orificium G F (ſi rurſus excipias pri-
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mas guttas) quam ſi vel tubus abeſt, vel Cylindricus eſſet. </
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<
s
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xml:space
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">Id etiam Frontinus
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experientiâ procul dubio edoctus affirmavit, alii vero moderni negarunt.</
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<
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</
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<
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<
s
xml:id
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">Igitur operæ pretium duxi rem experimento explorare. </
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<
s
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xml:space
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altitudo vaſis, quo uſus ſum, ſupra axem tubi = 5 {1/3} poll. </
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<
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<
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xml:space
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bi G N = 2 poll. </
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<
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<
s
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xml:space
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">diameter orificii G F erat = 3, 36. </
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<
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<
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aperturæ M N = 5, 48. </
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<
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<
s
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">erant proin amplitudines orificiorum ut 3. </
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<
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xml:space
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">ad
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8 proxime, amplitudo vaſis ſat magna erat, ut infinita cenſeri poſſet præ
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amplitudine tubi. </
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>
<
s
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xml:space
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">Volui omnes menſuras allegare, ut quivis experimentum
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repetere poſſit. </
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<
s
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xml:space
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">Hoc autem vaſe aqua repleto obſervavi amplitudinem jactus,
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& </
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<
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xml:space
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">ex hâc poſtquam omnes menſuras cognoviſſem requiſitas calculum poſui
<
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de altitudine, quæ velocitati aquæ transfluentis tum in G F, tum in N M
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deberetur: </
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<
s
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xml:space
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">hanc inveni proxime undecim linearum, atque proin alteram
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= poll. </
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<
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xml:space
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<
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<
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xml:space
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etiam experimenti genere inveni. </
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<
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xml:space
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<
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</
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<
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xml:space
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">cum 6 {2/9} lin. </
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<
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xml:space
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">quam 5 {1/3} poll. </
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<
s
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xml:space
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">confirmatur theoria noſtra de acceleratione aquæ
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internæ ab amplificatione tubi verſus extrema, quamvis multum abſit, ut
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duabus potiſſimum rationibus §. </
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<
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<
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">allegatis inductus præmonui, quin tan-
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tum revera acceleretur quantum vi §. </
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<
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<
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xml:space
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">remotis obſtaculis, quorum in cal-
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culo nulla ratio habita fuit, deberet.</
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<
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<
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<
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xml:space
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">Hoc paragrapho in tranſitu monui, multis modis fieri poſ-
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ſe, ut aër aquæ per tubos fluenti miſceatur. </
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<
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xml:space
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">Inde autem futurum, ut aquæ
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minori copia effluant quidem, ſed non minori velocitate, quod utrumque
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ut experirer primo in tubis A A & </
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<
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">A B (Fig. </
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<
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">& </
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<
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">25.) </
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<
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">non procul ab eorun-
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dem Origine parvulum utrobique feci foramen; </
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>
<
s
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tubos, cum aliquo ſtrepitu ferrentut & </
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<
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xml:space
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">turbidæ effluerent, ſuperficies au-
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tem ſolito multo lentius deſcenderet; </
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<
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