Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO QUARTA.
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acu ad inferiorem deſcendiſſe poſt intervalla 24. </
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<
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">automati pulſuum, quæ faciunt
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tempus 10. </
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<
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">minutorum ſecundorum.</
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<
s
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">Quod ſi vero tempus idem quæratur ad Hypotheſin, venam ſe nihil
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contraxiſſe, ſimulque aquas omni velocitate, quam vi theoriæ nullo præſen-
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te impedimento alieno habere debuiſſent, effluxiſſe, reperitur illud = 6 {7/8}
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min. </
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<
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<
s
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">Sic igitur concludi poteſt, fuiſſe amplitudinem foraminis ad ſectionem
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venæ contractæ ut 10. </
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<
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">ad 6 {7/8}, id eſt, α = 1, 45, cum in primo experimento fue-
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rit pro eodem foramine perpenſis omnibus circumſtantiis α = 1, 41.</
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<
s
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">Poſtquam hæc ita expertus fuiſſem, reſiduum erat explorare, an aquæ
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omni velocitate ad ſenſus effluxerint, qua de re eo magis dubitavi, quod
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creſcentibus velocitatibus aquæ, creſcant ſimul impedimenta, hæcque proin
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notabilia eſſe poſſint in majoribus aquæ altitudinibus, qualia in minoribus
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non ſunt.</
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<
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">Feci itaque omni adhibita cura (quod potiſſimum ad præciſionem ex-
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perimenti requiritur) ut aquæ ſub directione perfecte horizontali effluerent,
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& </
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<
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">acceptis menſuris tum amplitudinis jactus, tum altitudinis foraminis ſupra
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tabulam horizontalem, vidi ſubducto calculo, quod cum altitudo aquæ erat
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= 13. </
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<
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">aquæ effluxerint, ſeu potius per ſectionem
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venæ contractam transfluxerint, velocitate, quæ convenit altitudini 158 {1/2} lin.
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</
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<
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">igitur velocitas in calculo diminuenda eſt in ratione ſubduplicata harum altitu-
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dinum atque in eadem ratione proxime decreſcit valor inventus litteræ α, qui
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ita fit paullo minor quam 1, 42 ſeu rurſus 1, 41 & </
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<
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titudinem aquæ mutatam ad ſenſus non mutare contractionem venæ.</
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<
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preſentatur per (Fig. </
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<
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foraminis a c ut 110 ad 1. </
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<
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pore 21. </
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<
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<
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prius aquis effluxum concedendum eſſe, quam nullus in illis motus turbina-
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torius obſervetur; </
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<
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