Schott, Gaspar
,
Mechanica hydraulico-pneumatica. Pars I. Mechanicae Hydraulico-pnevmaticae Theoriam continet.
,
1657
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æquè altum ac ſuperficies ſuperior aquæ vaſis, hoc eſt, quando </
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externum crus eſt æquale interno quoad longitudinem, uſque
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ad aquæ ſuperficiem ſupremam vaſis, aqua non effluat ex crure
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externo, etiamſi ſiphon ſit plenus aquâ, eſſe, quia tunc aqua ſi
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phonis continuatur cum aqua vaſis, & utriuſque ſuperficies ex
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trema æqualiter diſtat à centro Mundi: Cauſam verò cur, quan
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do externi cruris orificium eſt demiſſius ſuperficie extrema aquæ
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vaſis, effluat, eſſe, quia tunc ſuperficies aquæ vaſis eſt altior, quàm
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ſuperficies aquæ cruris externi, cum cujus aqua continuatur, ac
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proinde tam diu fluere debet aqua vaſis, poſtquam ſemel fluere
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cœpit, donec ſuperficies fiant æqualiter diſtantes à centro Ter
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ræ. </
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>Ob contrariam ergo cauſam, ſecundùm Heronem non
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effluit aqua ex crure externo breviore, ſed refluit intra vas quia
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nimirum ſuprema ſuperficies aquæ vaſis eſt declivior, quàm ſu
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perficies aquæ cruris externi. </
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Heronis opi
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nio circa a
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quæ fluxum
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è crure ex
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terno ſipho
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nis.
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>Cœterùm cur aqua in ſecundo caſu, ex vaſe aſcendat ad
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ſiphonis ſummitatem, contra ejus naturam, indeque deſcendat
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ad orificium uſque externi cruris, non eſt ob cauſam jam adſigna
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tam, ſed ut impleat, aut impediat vacuum, ſeu quia trahitur vio
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lenter ad impediendum, aut implendum vacuum. </
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<
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>Quoniam
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enim ex crure externo extrahitur aër, trahit is ſecum, nè vacuus
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maneat ſiphon, & diſcontinuentur corpora, nempe aër & aqua,
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trahit inquam ſecum aquam uſque ad orificium cruris externi;
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quò ubi pervenerit, nullam ampliùs violentiam patitur ab aëre,
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nec ab alio extrinſeco agente, ſed naturæ ſuæ relinquitur, ut pars
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illa incipiat, aut proſequatur fluxum, cujus ſuperficies extre
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ma minùs diſtat à centro Mundi, duretque fluxus, donec am
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bæ ſuperficies æquales fiant. </
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Experimentum.
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<
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>ESſe porrò hanc, quam adſignavit Hero, genuinam dicti
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phænomeni cauſam, confirmat ipſe tali Experimento. </
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Si
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ſumentes,
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inquit,
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duo vaſa
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(cujuſmodi ſunt A & B in appo
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ſitis figuris)
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injiciemus humidum in utrumque ipſorum, & implentes
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