Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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dem verificetur, dum aqua
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in prædicto vaſe contenta
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prorsùs quieſcit, ſaltèm̨
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quoad ſenſus
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apparentiã
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,
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ſi poſtea aqua agitetur, vt
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nimirùm pars EF deſcen
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dat verſus vaſis fundum, reliqua verò pars FG, ſur
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sùm aſcendat motu quodam vertiginoſo, fi verum̨
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eſt, quòd motus aſcenſiuus ipſius aquæ indicat de
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fectum grauitatis eius, tunc perſeuerante dicto mo
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tu aſcenſus minui deberet pondus totius vaſis AC,
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& propterea libra HL non quieſceret, ſed deprime
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retur pondus R, quod tamen repugnat ſenſus eui
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dentiæ; non igitur ex eo quòd aqua mouetur in ali
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quo vaſe carebit propria, & natiua grauitate, ſicuti
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homo aſcendens per ſcalam extremo termino libræ
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alligatam æquali momento libram premeret, ac ſi
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idem homo in ſcala quieſceret, quia nimirùm dum
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aſcendit non minus ſuſtentatur quàm dum quieſcit. </
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Cap. 3. flui
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dum in ſuo
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toto quie
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ſcens pon
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derat.</
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<
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id
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">Sed dices, cum motus vertiginoſus aquæ fieri
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abbr
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nõ
">non</
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>
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poſſit abſque eo quod vna pars deſcendat, & reli
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qua ſubleuetur, eſt valdè probabile, vt ſicut aſcenſus
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aquæ FG indicat defectum grauitatis, cùm prædi
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ctus motus ſupponat impetum à quo ſursùm propel
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latur ſicuti ſaxum quod ſursùm proijcitur in actu ſui
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aſcenſus, neque graue dici poteſt, nec grauitatem
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exercet, proptereà quòd ab impetu impreſſo con
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trario grauitati, vel ipſamet grauitas deſtruitur, vel
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impeditur, & ceſſat eius operatio. </
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<
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