Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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HYDRODYNAMICÆ
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ſionem ex motu peti, prius ex circumſtantiis definiendo; </
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>
<
s
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echoid-s264
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xml:space
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">nec crediderim ali-
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am viam tuto iniri poſſe præter eam, quam ego ſecutus ſum: </
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>
<
s
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echoid-s265
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xml:space
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">conſideravi au-
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tem canalem, per quem aquæ fluunt eo in loco eoque temporis puncto, quæ
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quæſtioni conveniunt, amputatum; </
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<
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xml:space
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">poſteaque per regulas noſtras præmiſſas
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accelerationem indagavi particulæ aquæ imminentis, proximeque effluxuræ. </
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<
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xml:space
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">Ex
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iſta acceleratione colligere licebat compresſionem illius particulæ aqueæ, quæ
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compresſio per naturam fluidorum æqualis eſt presſioni in latera canalis. </
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>
<
s
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xml:space
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">Co-
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gnita hac presſione apparet, quid fieri debeat, ſi canalis eodem in loco per-
<
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foratus fuerit, tubulusque foramini reſpondeat; </
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<
s
xml:id
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echoid-s269
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xml:space
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">fore nempe, ut aqua in eo
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aſcendat ad certum uſque gradum ſtagnans in tubulo, & </
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>
<
s
xml:id
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echoid-s270
"
xml:space
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">ab aqua inferius per
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canalem præterfluente ſuſtenta, ſic, ut hic æquilibrium adſit inter aquas flu-
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entes & </
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<
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<
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xml:space
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">hoc vero nomine Theoriam iſtam hydraulico-ſtaticam com-
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mode vocari poſſe exiſtimavi. </
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<
s
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xml:space
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">Notari porro meretur, ipſam hanc Theoriam
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fundamentum rurſus eſſe & </
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<
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xml:space
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">fontem aliorum motuum antehac incognitorum.
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</
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<
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">Theoremata, quæ exponuntur, non nova ſolum, ſed & </
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<
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">pleraque inexpectata
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ſunt, quorum omnium veritatem nec ipſe plane mihi perſuadere potui, pri-
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uſquam experimenta inſtituiſſem, quæ mihi omnem ſcrupulum demebant. </
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Habent autem inſignem uſum, quandoquidem iis innititur vera presſionis
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aquarum, per aquæductus ſeu rivos fluentium, æſtimatio, hincque deducendæ
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tuborum firmitates requiſitæ. </
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<
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xml:space
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">Inde quoque pendent accuratæ menſuræ aqua-
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rum per modulos, rivo lateraliter inſertos, erogatarum: </
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<
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xml:space
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">in Phyſiologia re-
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ctius jam intelligentur, quæ pertinent ad motum humorum in corpore animali,
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& </
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">Denique progredior ad alios quosdam modos, quibus aqua ni-
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ſum facere poteſt, explicandos: </
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<
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">ita nempe aqua, dum per foramen effluit, in
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contrarium premit vas non aliter, atque globus retropellit tormentum, ex
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quo exploditur: </
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>
<
s
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xml:space
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">iſtius retropulſionis plures proprietates deteguntur novæ,
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quæ presſionum naturam egregie illuſtrant, earumque leges, quas affectant, ge-
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nerales in mechanicis rem iſtam ſerio meditantibus indicabunt. </
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<
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xml:space
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">Has diſqui-
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ſitiones feci, quia mihi viſum eſt, poſſe ea novæ aliquando navigationi ſine
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remorum, aut venti adminiculo excogitandæ occaſionem præbere; </
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>
<
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xml:space
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">qua de
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re ſuo loco pauca quædam afferam, etſi non ignoro, omnium hujusmodi re-
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rum primordia per ſe pleriſque videri ridicula. </
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<
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xml:space
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">Tandem etiam de vi aqua-
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rum ex impulſu hincque nato renixu, quam corpora in fluidis mota offen-
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dunt, Theoremata quædam adjiciuntur.</
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