Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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101 - 110
111 - 120
121 - 130
131 - 140
141 - 150
151 - 160
161 - 170
171 - 180
181 - 190
191 - 200
201 - 210
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221 - 230
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SECTIO TERTIA.
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xima videbatur, quo temporis puncto diſtantiam menſuravi ſuperficiei à loco
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A antea notato; </
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<
s
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">diſtantia illa, quam eandem cum maximo deſcenſu A E fore pu-
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tabam, opinione longe minor fuit; </
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<
s
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echoid-s1605
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xml:space
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">unde edoctus fui partem aquæ, quæ
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in experimento jam per B effluxerat, tubum rurſus ingreſſam fuiſſe.</
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<
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<
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<
s
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xml:space
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">His ita obſervatis, magnitudines B P & </
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<
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">A E calculo quæſivi ad normam
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§. </
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<
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">27. </
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<
s
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echoid-s1610
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xml:space
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">ponendo m primo = n deinde mm = 2nn, inveni autem in caſu prio-
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re B P = 79. </
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<
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xml:space
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">quæ in experimento non ſuperavit 33. </
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<
s
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echoid-s1612
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xml:space
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">maximumque deſcen-
<
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ſum AE proxime reperi = 250. </
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<
s
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xml:space
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">quem experimentum dedit 88. </
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<
s
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echoid-s1614
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xml:space
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">dein pro
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caſu mm = 2 nn oritur B P præter propter dupla illius, quæ obſervata
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fuit & </
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<
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">A E = 186. </
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<
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xml:space
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">quæ 54. </
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<
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<
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<
s
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xml:space
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">Enormes has differentias maxima ex parte adhæſioni aquæ ad latera tu-
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bi tribuo, quæ certe adhæſio in hujusmodi caſibus incredibilem exercere po-
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teſt effectum, uſus enim ſum tubo vix ultra duas lineas in diametro haben-
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tem, majorem utique conſenſum experturus cum tubo ampliore. </
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<
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xml:space
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">Interim
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veriſimile eſt, curvaturam tubi in parte inferiore, aliquid etiam motui derogare.</
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<
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<
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xml:space
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">Eodem tubo recurvo, quem modo deſcripſi, uſus ſum: </
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<
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culum autem poſui in B minimo foramine pertuſum: </
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<
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xml:space
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">feci ut totus aquâ
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eſſet plenus præter particulam F G B, in quo ſitu aquam detinui ope digiti
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orificio C appoſiti. </
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<
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xml:space
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">Remoto digito deſcendit aqua, & </
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<
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xml:space
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">cum perveniſſet in
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ſitum H D B, guttulæ aliquot tanto impetu per foraminulum in B fuerunt
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veluti exploſæ, ut ad altitudinem plusquam decem pedum aſcenderint, quam-
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vis altitudo H A altitudinem dimidii pedis vix ſuperaret. </
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<
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xml:space
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">Interim ob exigui-
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tatem foraminuli tantam reſiſtentiam offendit aqua dum tranſiret orificium, ut
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fracto impetu aqua non ſolum non ad altitudinem A H aſcenderit (ſupra quam
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tamen remotis omnibus impedimentis aſſilire paullulum continue debuiſſet)
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ſed vix guttula una aut altera notabili temporis mora fuerit expreſſa, ita ut mihi
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perſuadeam, ſi absque impetu ſola aquæ preſſione naturali tantus jactus pro-
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ducendus fuiſſet, id fieri non potuiſſe niſi altitudine minimum centum pedum.</
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<
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xml:space
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">Dein etiam obſervavi jactum aquæ diminui eo magis quo minus ante
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experimentum relinquitur ſpatium G B; </
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<
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">quæ omnia theoriæ ſunt conformia.
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</
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<
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xml:space
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">Menſuras ſuperfluum fuiſſet ſumere, quia ob nimia impedimenta tantus eſſe
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utique nequit jactus aquæ, quantus illis remotis futurus fuiſſet. </
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<
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& </
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ſumſi ampliorem, ut impedimenta adhæſionis maxima parte auferrem, </
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