Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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156
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HYDRODYNAMICÆ
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">Tubum cylindricum vitreum, qui tres præterpropter lineas habebat
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in diametro immerſi ad altitudinem 20. </
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<
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<
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">fecique, ut aqua in illo libraretur,
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elevata prius aquâ ad altitudinem unius fere pollicis. </
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<
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xml:space
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">Ultra quatuor vel
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quinque itus reditusque bene notabiles non fecit, nec adeoque omni rigore
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longitudinem penduli ſimplicis iſochroni examinare potui; </
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<
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viſa fuit 22. </
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">ex quo intuli adhæſionem aquæ ad latera tu-
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bi non ſolum diminuere excurſiones, ſed & </
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<
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oſcillationum: </
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">eſſe præfata longitudo vi-
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ginti tantummodo pollicum. </
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">Idem expertus ſum in oſcillationibus, quas
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in ſuperiori ſectione pertractavimus.</
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">Cæterum obturato vel ad dimidium fere orificio inferiori, obſervare
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non potui, excurſiones inde fuiſſe diminutas aut oſcillationes retardatas,
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quod conforme eſt cum iis, quæ §. </
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<
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">immerſi aquæ orificio ampliore,
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ita ut unicus pollex extra aquam emineret: </
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terius paululum plusquam duplum. </
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">Longitudinem penduli iſochroni cum
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vibrationibus aquæ in tubo libratæ inveni quindecim poll. </
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cundum §. </
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">Denique ſimiliter eodem tubo uſus, ſed ſitu inverſo, deprehendi longitudi-
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nem penduli iſochroni tantillo plusquam duplam ejus, quæ antea fuerat,
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prouti citato paragrapho indicatur.</
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