Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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s.001628
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310
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010/01/318.jpg
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iacet in plano horizontali, nullo pacto verificari po
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teſt, niſi in ipſo fluido ponatur virtus aliqua motiua,
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qua ſi omninò careat, nullo pacto poterit aqua fluida
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explanari, & ad libellam horizontalem reduci. </
s
>
<
s
id
="
s.001629
">At
<
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huiuſmodi virtus motiua longè diuerſa eſt ab ea, quæ
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exigitur à Carteſio, eiuſque ſectatoribus, non enim̨
<
lb
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eſt motiua virtus vaga, & irregularis, quæ inordina
<
lb
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tam agitationem ſursùm, & deorsùm, & tranſuersè
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continuato fluxu efficiat, ſed eſt tantummodò vis, at
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que impetus naturalis grauitatis, ope cuius particu
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læ omnes fluidi æquali niſu
<
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abbr
="
tendũt
">tendunt</
expan
>
, ac feruntur deor
<
lb
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sùm; ſic enim æquatis momentis efficitur
<
expan
abbr
="
æquilibriũ
">æquilibrium</
expan
>
<
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partium eiuſdem fluidi, vnde ſubſequitur æqualis di
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ſpoſitio earum
<
expan
abbr
="
horizõtalitèr
">horizontalitèr</
expan
>
; ſi enim huiuſmodi gra
<
lb
/>
uitas in fluido deficeret, non poſſet virtute æquilibrij
<
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/>
æqualitèr diſponi, ſed vna eius pars depreſſa, alia ve
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rò ſublimis efficeret inæqualem, & aſperam ſuperfi
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ciem externam eius, compoſitam ex vallibus, &
<
expan
abbr
="
mõ-tibus
">mon
<
lb
/>
tibus</
expan
>
. </
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<
s
id
="
s.001630
">Neceſſariò ergò fatendum eſt in hiſce fluidis
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lb
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noſtratibus vim motiuam aliquam adeſſe vt omnes
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æquali vi, & impetu, ad eaſdem partes, ſcilicèt deor
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sùm tendant. </
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>
<
s
id
="
s.001631
">Et profectò ſi ponerentur motus vagi
<
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/>
irregulares, & contrarij in eodem corpore fluido, vt
<
lb
/>
aduerſarij exiſtimant, ſequeretur deſtructio
<
expan
abbr
="
eiuſdẽ
">eiuſdem</
expan
>
<
lb
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hypotheſis, nam cùm in eadem aqua v. g. non poſ
<
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ſint omnes particulæ eiuſdem aquæ ex condicto ſi
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mul ad eaſdem partes ordinata ſeriè moueri, vt iņ
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progreſſu alicuius cohortis, vel vt in ſupplicationi
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bus fieri ſolet, omninò neceſsè eſt, vt aliæ partes </
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