Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO DECIMA.
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dus columnæ A g, antequam novus caloris gradus ſuperveniret, = A, alte-
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rius B h = α, pondus columnæ g C = B, columnæ h D = β: </
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<
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xml:space
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lumnæ A g rarefactæ = C, pondus columnæ B h itidem rarefactæ = γ: </
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titudo mercurii in g ante expanſionem aëris A g & </
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xml:space
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">B h = l, altitudo ſimilis
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poſt iſtam expanſionem = x & </
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<
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">habebimus hanc analogiam
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B + β: </
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<
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xml:space
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xml:space
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">: B + A - C + β + α - γ: </
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<
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xml:space
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<
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xml:space
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">unde eſt
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x = {B + A - C + β + α - γ/B + β}l.</
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<
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<
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">Igitur aſcendet mercurius ab rarefacto aëre inferiore per altitudinem
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x - l = {A - C + α - γ/B + β} l = (poſitis omnibus in utroque tubo paribus) {A - C/B} l.</
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">Refrigeſcente autem rurſus aëre in A g & </
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<
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">B h iterum deſcendet mercu-
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rius in utroque barometro.</
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">Notandum hic eſt, poſſe hoc modo à parvula caloris mutatione in A g
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atque B h notabilem oriri in barometro variationem ob inſignem aëris denſi-
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tatem in partibus inferioribus, qua fieri poteſt, ut in parte A g multo plus
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aëris contineatur (imo infinities, ſi aër vi infinita preſſus in infinitè parvum
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ſpatium condenſari ponatur) quam in reliqua g C, etiamſi longitudine infini-
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ta. </
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">Unde ſi pondus A admodum majus ſit pondere B, ſimulque manente
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cauſa aërem rarefaciente, pondus C datam ſervet rationem ad A, quod ita
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fere fit, apparet aſcenſum mercurii à minimo caloris gradu ſuperveniente in
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A g poſſe utcunque magnum eſſe.</
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<
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">Equidem ſi fingatur, partes A g & </
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">B h ſtrictiores admodum eſſe præ
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amplitudinibus in g C & </
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">h D, intelligitur variationes barometi ab aucto di-
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minutove caloris gradu in A g & </
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">B h ita fieri minus notabiles, quia ponde-
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ra A & </
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">α ipſaque C & </
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">γ prioribus proportionalia hocmodo decreſcunt; </
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men variationes barometricæ, quæ ab hac cauſa proveniant, etiamnum ut-
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cunque magnæ concipi poterunt.</
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<
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xml:space
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">Hæc dum ita perpenduntur, veriſimile fit variationes barome-
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tricas maxima parte petendas eſſe à celeribus caloris mutationibus in cryp-
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tis ſubterraneis. </
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notum eſt: </
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<
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">in terra etiam ſolida pori facere poſſunt quod cryptæ: </
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nes cavitates (tum quæ à cavernis, tum quæ à poris aërem continentibus </
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