Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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1
motu ferri, quàm minus igitur falſa eſt poſitio.
Cap. 10. de
æquitempo­
ranea natu­
rali veloci­
tate grauium.
Secundò, ſi fieri poteſt, eodem tempore T percur­
rat A minus ſpatium D, quàm F tranſactum à minori
corpore B; & ſumatur tertium corpus G homogeneum
ipſis A, & B, ſed maius, quàm A, quod partes ſit ip­
ſius B; patet corpora B, G æquè velocia eſſe, igitur
eodem tempore T maius corpus G percurrit maius ſpa­
tium F, dùm minus corpus A pertranſit minus ſpa­
tium D; quod eſt abſurdum, & contra hypotheſim,
debuerat enim maius corpus minus ſpatium, ſeù tar­
diori velocitate excurrere.
Quare corpus maius A,
neque celeriùs, neque tardiùs deſcendet, quàm B,
proindeque eadem velocitate feretur; quod erat &c.
PROP. CCIX.
Duo corpora heterogenea æquè grauia comprehenſa ab æqua­
libus perimetris figurarum ſimilium, & æqualium; in eo­
dem medio fluido æquè velocitèr deſcendent ſi in ipſo mo­
tu ſimilitèr diſpoſit a fuerint; idemque in vacuo continget.
SInt duo corpora heterogenea A, & B, æquè gra­
uia, comprehendanturque ambo ab æqualibus
ſuperficiebus ſphæricis, vt nimirum pila A ſit lignea,
& plena, altera verò B ſit phiala vitrea, cuius pars
extima CD ſolida ſit, comprehenſa à duabus ſphæricis
figuris, pars verò inteſtina B ſit excauata, & ab aere
repleta, dico, quod hæc duo corpora in eodem me­
dio fluido aereo v.g. æquali velocitate deſcendent.
Quoniam, vt dictum eſt cap. 2. huius operis, cor-

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