Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſatur, conſtipaturque, & primum vocatur augmen
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tum grauitatis extenſiuum, reliquum verò
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intenſiuũ
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.
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<
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grauitatis commodè deſumitur à vi contraria, quæ
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depreſſionem eius prohibere poteſt, & hic
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notandũ
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eſt minimè nos ſollicitos eſſe de velocitate motus,
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qua deorsùm eadem grauia feruntur, ſed tantummo
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dò conſiderare vim, & conatum ponderis eius, qui
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in libra à vi oppoſiti
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æquipõdij
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præcisè menſuratur.
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Vis compri
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mens exten
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ſiuè augetur
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multiplicata
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mole corpo
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ris.</
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<
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abbr
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Intẽſiuè
">Intenſiuè</
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ve
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rò conſtipa
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ta, & conden
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ſata mate
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ria.</
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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Gradus præ
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dictæ graui
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tatis menſu
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ratur à vi
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abbr
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cõtraria
">con
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traria</
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, quæ
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<
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depreſſionẽ
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eius prohi
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bere poteſt.</
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Hic no agi
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tur de velo
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citate
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abbr
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deſcẽ-ſus
">deſcen
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ſus</
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, ſed de vi
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<
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abbr
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.</
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SVPPOSITIO IX.
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Vis ſursùm
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abbr
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impellẽs
">impellens</
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quę
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leuitas voca
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tur augeri po
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teſt extenſi
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uè multipli
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cato eodem
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corpore le
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ui.</
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<
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corpora, quæ leuia appellantur ſursùm moue
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ri nituntur, quæritur non velocitas, ſed vis, quæ
<
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ſursùm impellit, quæ leuitas appellari ſolet, & hæc
<
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quoque duplici modo augeri poteſt, aut extenſiuè,
<
lb
/>
aut
<
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abbr
="
intẽſiuè
">intenſiuè</
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>
, ſcilicèt aut
<
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abbr
="
multiplicãdo
">multiplicando</
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>
molem
<
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abbr
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eiuſdẽ
">eiuſdem</
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>
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corporis leuis, vt ſphæra aeris palmaris octies
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abbr
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maio-rẽ
">maio
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rem</
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<
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leuitatẽ
">leuitatem</
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habebit,
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abbr
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quã
">quam</
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ſphæra
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abbr
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eiuſdẽ
">eiuſdem</
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aeris ſemipal
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maris, propterea quod vis illa leuitatis tantumdem
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multiplicatur, quantum maſſa eius corporea exten
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ditur, cùm omnes partes eiuſdem aeris æquè leues
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ſint, & æquè raræ, requiraturque vis contraria pro
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hibens illius aſcenſum octiès maior quam in huius
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aeris minori mole requiratur. </
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<
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ri poteſt leuitas expandendo, & rarefaciendo
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