Schott, Gaspar
,
Mechanica hydraulico-pneumatica. Pars I. Mechanicae Hydraulico-pnevmaticae Theoriam continet.
,
1657
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FE internum, crus verò FN
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externum. </
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>Huius ſiphonis
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variæ ſunt proprietates, provt
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variè diſponi poterit crus eius
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externum. </
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Prima Proprietas.
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<
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>Si enim crus exter
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num FN maneat integrum,
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& ex ore N exſugatur aër; ſe
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quetur aqua vaſis, ob vacui
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metum, & tota effluet, aut pœ
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nè tota (donec nimirum aquæ
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ſuperficies ſuperior CD deſcen
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derit vſque ad oſculum E) ſi
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internum crus fundum pœnè
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tangat. </
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>Ratio eſt, quia per
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pendiculum externi cruris eſt
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longius quàm interni. </
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<
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>Si to
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tus ſiphon aquâ impleatur, &
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vtrumque orificium claudatur, ac deinde minus crus EF aquæ
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imponatur, maiori foras prominente, & ſimul vtrumque orifi
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cium aperiatur; idem fiet. </
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<
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>Effluet tamen inæqualiter, cum perpetuo
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celerita
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tis decremento, quia perpendiculum aquæ cruris interni, altitu
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do nempe aquæ à puncto P uſque ad ſuperficiem ſuperiorem
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aquæ vaſis (hæc enim ſola premit actu, reliquæ verò inferiores
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actu non premunt, per dicta cap. 1. Proprietate V.) ſemper ma
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gis ac magis creſcit, ac proinde ſemper magis magiſque reſiſtit
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perpendiculo aquæ cruris externi. </
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<
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>Quò verò crus externum longius fuerit infra ſuperficiem </
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ſuperiorem aquæ vaſis, eò fluet aqua celeriùs, & æqualibus tem
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poribus copioſiùs: quia tunc eò magis perpendiculum externi
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ſuperabit perpendiculum interni cruris in longitudine, & vi pre
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mendi deorſum. </
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<
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