Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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433
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ra ſuſpenſa, planè non agunt grauitate, quæ non ſur
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sùm, ſed deorsùm operari, & impellere valet; et ta
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men in ijs omnibus, quæ denſiora ſunt, aut copioſio
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ri ſubſtantia materiali donantur magis, & faciliùs
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medij fluidi, & obſtaculorum impedimenta
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abbr
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ſuperãt
">ſuperant</
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.
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</
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<
s
id
="
s.002248
">Non igitur à grauitate, quatenùs talis eſt medij flui
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di
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abbr
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reſiſtẽtia
">reſiſtentia</
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ſuperatur, ſed ab alia
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abbr
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cauſalõgè
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diuerſa. </
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Cap. 10. de
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æquitempo
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ranea natu
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rali veloci
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tate
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abbr
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grauiũ
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.</
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<
s
id
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">Sed ponamus à maiori vi motiua grauiorum cor
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porum magis, & faciliùs medij fluidi reſiſtentiam ſu
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perari, non indè ſequetur, magis grauia celeriorem̨
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motum deſcenſus producere niſi ex accidenti, nam ſi
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reuera efficiens cauſa velocitatis eſſet grauitas, ne
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ceſſariò effectus velocitatum proportionales eſſent
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ſuis cauſis, ſcilicèt grauitatibus, vti Aduerſarius
<
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abbr
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cũ
">cum</
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Ariſtotele ſuſtinere tenetur. </
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<
s
id
="
s.002251
">hoc autem falſum eſſę
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manifeſtum eſt; nam duæ pilæ æquales vna aurea, al
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tera marmorea, quæ in fluidis craſſioribus feruntur
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velocitatibus notabili exceſſu inter ſe differentibus,
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in aere poſtea æquè veloces eſſe videntur. </
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<
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id
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s.002252
">igitur illa
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inſignis differentia velocitatum ab
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expan
abbr
="
impedimẽto
">impedimento</
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>
me
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dij fluidi craſſioris dependet
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expan
abbr
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nõ
">non</
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ab inæqualibus gra
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uitatibus, quæ æquè veloces in aere eſſe videntur. </
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<
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id
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">Sed pro clariori huius rei euidentia ſupponamus
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validum equum æquali velocitate currere, ac canis a
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liquis venaticus, ſubmergantur poſtea omninò am
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/>
bo infra aquam, vel infra lutum, procùl dubio maior
<
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/>
vis, & robur equi minùs impediri poterit à denſitate
<
lb
/>
aquæ, vel luti, quàm canis exigua vis impediatur,
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& propterea equus demerſus velociùs agitari, moue-</
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