Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

Table of figures

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              Cap. 11. gra­
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              uia in fluido
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              velocitati­
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              bus inæqua­
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              libus ferri
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              debere.</s>
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              PROP. CCXVII.
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              E fiſtulis inæqualitèr amplis, & æquè altis quarum infima
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              ostiola
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              alia æqualia ſint, æquè velocitèr aquæ mo­
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              les æquales effluunt.
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              <s id="s.002400">ET primò animaduertendum eſt, quòd in prædi­
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              ctis fiſtulis orificia infima
                <expan abbr="perpẽdicularia">perpendicularia</expan>
              ad di­
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              rectionem fluxus liquoris è fiſtula egredientis
                <expan abbr="tantũ-modò">tantunm
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                modò</expan>
              conſideranda veniunt, & nil refert an internæ
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              cauitates ampliores ſint orificijs ipſis (non enim hìc
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              agimus de fiſtulis infernè dilatatis ad inſtar coni);
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              quandoquidem ratio haberi debet illius portionis a­
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              quæ, quæ deorsùm fluit, non verò illius, quæ in quiete
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              conſiſtit, vt v.g. ſi fuerit fiſtula aliqua vitrea ad hori­
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              zontem perpendicularis, & puteus æquè altus, iņ
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              cuius fundo aperiatur foramen prorsùs æquale infi­
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              mo fiſtulæ foramini, tunc aqua ab orificio putei pro­
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              fluit eadem ferè velocitate, & æquali mole, ac ex il­
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              la fiſtula vitrea æquè plena egreditur, proptereą
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              quòd in aqua putei concipi debet fiſtula perpendi­
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              culariter horizonti erecta ab infimo foramine vſque
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              ad ſummitatem aquæ, & ſolummodò prædicta aqua
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              in fiſtula imaginaria contenta fluit, reliqua verò col­
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              lateralis innititur ſuftentaturque à fundo impenetra­
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              bili, & firmo ipſius putei, à quo aquæ fluxus
                <expan abbr="perpẽ-dicularis">perpen­
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                dicularis</expan>
              impeditur, & ideò perindè aqua excurrit
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              perpendicularitèr, ac ſi in fiſtula vitrea contineretur.
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              <s id="s.002401">Verum tamen eſt, quòd ſuperficies dura interna fi­
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              ſtulæ vitreæ magis ſuis aſperitatibus impedit efflu­
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              uium aquæ, quàm parietes aquei in imaginaria ílla </s>
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