Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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FBAG, quæ æqualibus motibus inter ſe contrarijs
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mouentur, tantumdem enim ſolidum aſcendit, quan
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tum aqua collateralis deprimi
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tur: & ſiquidem ſolidum eiuſ
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dem grauitatis ſpecificæ, ac a
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qua fuerit, tunc perindè eſt ac
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ſi portio aquea FBAG eſſet e
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iuſdem ſubſtantiæ, ac lignum̨
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BEQA, vel è contrà lignum eſ
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ſet aqua, & tunc patet, quod
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centrum grauitatis aggregati
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ex ligno, & aqua collaterali ei
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æquali inſiſtet præcisè perpen
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dicularitèr ſuper libræ centrum, ſeu fulcimentum B,
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& ideò nulla ratio ſuadet, quod prædictum æquili
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brium alteretur, & proindè neque lignum aſcendet,
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neque aqua deprimetur, vel è contrà, ſed in
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ſi
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tu intra fluidum fixè perſiſtet. </
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graue ſpecie fuerit, quam aqua collateralis, tunc
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patet, quod centrum communis grauitatis ſolidi, &
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fluidi non inſiſtet vt priùs perpendicularitèr ſuprą
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fulcimentum B libræ ſubiectæ, ſed cadet vltra ipſum
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versùs F, & tunc iuxtà naturam penduli libram FE
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flectetur, vel potiùs in ſiphone aqua deſcendet, &
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lignum eleuabitur. </
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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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<
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">Id quod dictum eſt de radio phyſico, ſeù ſe
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ctore FE, dicendum eſt de reliquis omnibus partibus
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tùm aquæ ambientis, cùm cylindri lignei, vndè con
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ſtituuntur innumeræ libræ, ſeù potiùs libra ſuperfi-</
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