Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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<
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">De affectionibus atque motibus fluidorum elaſti-
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corum, præcipue autem aëris.</
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">FLuida nunc elaſtica conſideraturis licebit nobis talem iis affinge-
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re conſtitutionem, quæ cum omnibus adhuc cognitis conveniat
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affectionibus, ut ſic ad reliquas etiam nondum ſatis exploratas
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detur aditus. </
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<
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xml:space
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">Fluidorum autem elaſticorum præcipuæ affectio-
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nes in eo poſitæ ſunt: </
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. </
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<
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xml:space
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">ut ſint gravia, 2
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. </
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<
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">ut ſe in omnes plagas expli-
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cent, niſi contineantur, & </
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. </
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<
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">ut ſe continue magis magisque comprimi
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patiantur creſcentibus potentiis compreſſionis: </
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<
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">Ita comparatus eſt aër, ad
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quem potiſſimum præſentes noſtræ pertinent cogitationes.</
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<
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">Finge itaque vas cylindricum verticaliter poſitum A C D B
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(Fig. </
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<
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">atque in illo operculum mobile E F, cui pondus P ſuper in-
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cumbat: </
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<
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">contineat cavitas E C D F corpuſcula minima motu rapidiſſimo
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hinc inde agitata: </
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<
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">ſic corpuſcula, dum impingunt in operculum E F idem-
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que ſuis ſuſtinent impetibus continue repetitis fluidum componunt elaſticum
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quod remoto aut diminuto pondere P ſeſe expandit: </
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<
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">quod eodem aucto
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condenſatur & </
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<
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">quod in fundum horizontalem C D haud aliter gravitat, ac ſi
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nulla virtute elaſtica eſſet præditum: </
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<
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">ſive enim quieſcant corpusſcula ſive agi-
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tentur, non mutant gravitatem, ita ut fundum tum pondus tum elaſticita-
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tem fluidi ſuſtineat. </
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<
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">Tale igitur fluidum quod cum primariis convenit flui-
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dorum elaſticorum affectionibus ſubſtituemus aëri, atque ſic alias, quæ jam
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in aëre detectæ fuerunt explicabimus aliasque nondum ſatis perpenſas ulte-
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rius illuſtrabimus proprietates.</
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">Corpuſcula cavitati cylindri incluſa conſiderabimus tanquam nu-
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mero infinita, & </
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<
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">cum ſpatium E C D F occupant, tunc aërem illa dicemus
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formare naturalem, ad cujus menſuras omnia ſunt referenda: </
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