Schott, Gaspar, Mechanica hydraulico-pneumatica. Pars I. Mechanicae Hydraulico-pnevmaticae Theoriam continet. , 1657
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              Propoſitio VII.
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              Cauſam adſignare, cur quando oſculum externi cruris
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              ſiphonis inverſi, eſt altius, aut æquè altum ac aquæ ſuperficies
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              ſuprema in vaſe, aqua non fluat; quando verò
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              eſt demiſſius, fluat.
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              <s>VIdimus, experientiam docere, quando perpendiculum cru­
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              ris externi ſiphonis inverſi, eſt minus, aut æquale perpendi­
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              culo cruris interni, uſque ad ſupremam aquæ ſuperficiem aquam
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              non effluere poſſe per os externi cruris, ceſſante ſuctu, ſeu attra­
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              ctione; quando verò perpendiculum externi eſt majus quàm in­
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              terni cruris in ſenſu expoſito, fluere donec æqualia fiant perpen­
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              dicula, aut donec tota effluxerit aqua ex vaſe. </s>
              <s>Quæritur nunc
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              hujus phænomeni cauſa.
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              Siphonis
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              crus longius
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              ſuperat bre­
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              vius, non
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              capacius mi­
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              nus capax.
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              <s>Hero Alexandrinus in libello de Spiritalibus cap 1. ait,
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              quoſdam putare, cauſam eſſe, quòd aqua cruris externi debeat
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              trahere aquam cruris interni, ac proinde illa debeat eſſe major
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              ac copioſior, quàm hæc. </s>
              <s>Sed hoc minimè verum eſſe, patet ex
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              eo (quod etiam Hero advertit) quòd licet crus externum ſit lon­
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              gè amplius atque capacius interno,
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              plùs aquæ conti­
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              neat; ſi tamen longius non eſt, nequaquam effluit ex ipſo aqua,
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              ſed ubi ceſſat violenta ſuctio, ſeu tractio, tota refluit per crus in­
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              ternum longius intra vas. </s>
              <s>Non ergo externum crus ſuperat in­
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              ternum, quòd aquæ plùs contineat. </s>
              <s>Itaque videamus natura­
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              lem cauſam & genuinam, ex Heronis primò, deinde ex noſtra
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              ſententia. </s>
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              <s>Diximus cap. 1. Propriet. II. aquæ continuæ & quieſcentis
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              ſuperficiem ſuperiorem eſſe ſphæricam (etiam in parvis vaſis, &
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              receptaculis, licet inſenfibiliter) centrum habentem idem quod
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              Terra, ſeu globus Terraqueus; non quieſcentem verò aquam
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              tam diu fluere, donec partes continuæ in una ſuperficie ſphærica
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              conſtituantur, hoc eſt, donec omnes extimæ ſuperficiei partes
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              continuæ æqualiter diſtent à centro Terræ. </s>
              <s>Hoc poſito putat
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              Hero, cauſam ob quam, quando externi cruris orificium eſt </s>
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