Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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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.</
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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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horizõt
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alia æqualia ſint, æquè velocitèr aquæ mo
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les æquales effluunt.
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<
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">ET primò animaduertendum eſt, quòd in prædi
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ctis fiſtulis orificia infima
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perpẽdicularia
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ad di
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rectionem fluxus liquoris è fiſtula egredientis
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tantũ-modò
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modò</
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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
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perpẽ-dicularis
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dicularis</
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impeditur, & ideò perindè aqua excurrit
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perpendicularitèr, ac ſi in fiſtula vitrea contineretur.
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<
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ſtulæ vitreæ magis ſuis aſperitatibus impedit efflu
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uium aquæ, quàm parietes aquei in imaginaria ílla </
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