Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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HYDRODYNAMICÆ.
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<
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style
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xml:space
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">De Velocitatibus maximis fluidorum per foramina
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valde ampla effluentium.</
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xml:space
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<
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<
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">longitudinis quatuor pollicum
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<
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">Fig. 22.</
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oblique ad horizontem poſui, in eoque ſitu firmavi, erat autem
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amplitudo tubi ad amplitudinem luminis in A ut 2 ad 1. </
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<
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">& </
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<
s
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xml:space
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">quidem dia-
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meter tubi præter propter ſeptem lineas exæquabat; </
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<
s
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xml:space
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">Dein menſuris acceptis
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in particulis æqualibus linearum F E, A B & </
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<
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xml:space
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ſe patet) illas inveni 81. </
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<
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<
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<
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<
s
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">His ita præparatis, tubum aquâ replevi, digito interim obturato ori-
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ficio A, eoque confeſtim remoto aquæ breviſſimo tempuſculo effluxere om-
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nes: </
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<
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">obſervare tamen potui, primas & </
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<
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">ultimas propius ad verticalem AB,
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quam medias cecidiſſe; </
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<
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xml:space
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">guttas autem longiſſime projectas incidiſſe in locum
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C invenique poſt ſæpius repetitum experimentum BC particularum, qui-
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bus antea uſus fueram, 235.</
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<
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">Jam vero ſi per præmiſſum lemma quæratur altitudo E G, ad quam guttæ
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maxima velocitate ejectæ aſcendere poſſint, reperitur E G = 56. </
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<
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<
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beret autem vi §. </
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<
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= 62. </
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<
s
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xml:space
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">niſi attritus aquæ ejusquæ adhæ-
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ſio ad latera tubi impedimentum motui afferret: </
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<
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expectavi.</
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<
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">Poſitis quæ prius, diminuto tantum ad dimidium foramine A,
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ita ut amplitudo tubi eſſet quadrupla amplitudinis ad lumen pertinentis, ob-
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ſervavi B C = 252; </
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<
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xml:space
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<
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theoriam autem debuiſſet eſſe = 70; </
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<
s
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">numeri hi minus differunt quam
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præcedentes, quia hîc multo minus fuit attritus impedimentum ob diminu-
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tam velocitatem internæ aquæ. </
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<
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profecto theoriam confirmat.</
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