Bernoulli, Daniel, Hydrodynamica, sive De viribus et motibus fluidorum commentarii

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4228HYDRODYNAMICÆ. mercurio, in vaſe alio ſervato, tantillum, ſic ut pars ſubmerſa tubi ſit C α,
non
ſolum non aſcendit mercurius in tubo uſque in β (ſumta ſcilicet C α =
M
β) ſed &
omnis fere effluit, donec ſuperficies M N pervenit in α. Por-
ro
tubum A C D B vacuum ſat profunde mercurio, qui erat in vaſe alio,
ſubmerſi
, nec tamen prius quicquam influere cœpit ex vaſe in tubum,
quam
ad altitudinem C M eſſet ſubmerſus;
& tunc ſtatim eo usque influit
donec
ab utraque parte ad libellam ſit conſtitutus, nempe usque in M N, ſi
ad
eum locum usque erat ſubmerſus.
Omnia hæc ex mutua particularum
mercurialium
attractione facile deducuntur.
Cæterum dedi operam ut in-
veſtigarem
relationem, quæ eſt inter altitudinem M C &
amplitudinem
foraminuli
o;
veriſimile utique eſt altitudinem illam eſſe in ratione recipro-
ca
diametri ad foraminulum pertinentis;
nec tamen experimento conjectu-
ram
ſatis confirmare potui, tum ob impuritatem mercurii quo utebar, quæ
faciebat
, ut non variato foramine in iteratis experimentis altitudo ſuſpenſi
mercurii
ſibimet ipſi non omnino conſtaret, tum etiam, quod difficile eſt
foraminula
minima accurate metiri;
debent enim foraminula eſſe minima,
quandoquidem
altitudo mercurii ſuſpenſi vix eſt ſex octove linearum, cum
diameter
foraminis ſextam partem lineæ æquat, dicam tamen qua metho-
do
uſus fuerim.
Filis nempe æneis, quibus in inſtrumentis muſicis utun-
tur
, diverſæ craſſitiei, quorum diametros minimas ex longitudine &
pon-
dere
eorum rectiſſime cognovi, chartulam C D perforavi;
ſed ſic ſolent
oriri
circa latera foraminis fimbriæ quæ effluxum impediunt, &
facile ſucce-
dit
ut foramen majus ſit quam eſt craſſities fili.

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