Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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1niſi ex principijs geométricis, quare ficat de lride multa
pertractantur
in Phyſica, quod ramen non tollit omnimodam
eius
cognitionem ad Perſpectiuam referri, ita quamuis mul­
ta
de graui & leui ſumantur ex phyſicis, hoc non obſtat quo­
minus
prout artificiosè mobilia ſunt, ex profeſſo & omnino
ſolum
cognoſcantur in hac ſcientia ex principijs mathemati­
cis
.
Et ſic, grauia æqualia ex æqualibus diſtantijs æquè pon­
derare
, vnumque in libra non poſſe aliud vincere, non ſatis
probatur
ex illo principio physico, quod àctio debeat eſſe ab
inæquali
proportione.
Quando quidem inæqualitas diſtan­
tiæ
non tollit æqualitatem ponderis, nec proportionem illius
ad
alterum, ſi ſecundum ſe ac phyſicis conſideretur, tollit
autem
ſe mathematicè demonſtratur, maiorem diſtantiam à
centro
, vbi grauia falciantur, grauitatem, vel potiùs effe­
ctum
illius, actumque ponderandi in ipſis grauibus augere.
Item maior velocitas, ac facilitas quam experimur in motu
circulari
earum partium, quæ magis diſſant à centro, non
probatur
à priori, nec demonſtratur ex eo quod maius ſpa­
tium
percurrant in æquali tempore, nam hoc eſt idem per
diuerſa
explicare.
Demonſtratur autem per cauſam, & à
priori
, ex illo principio mathematico, quod quanto magis li­
neæ
à centro diſceſſerint, magis participant de motu recto
ac
naturali, minusque retrahuntur in circumuolutione circull,
at
ſuo lo eo explicabitur ex Ariſtotele qui ſanè in hoc alijsque
dogmatibus
mechanicis non vtitur demonſtrationibus geo­
metricis
ad exemplum, vt in logica vel phyſica, neque ad
confirmationem
veritatis probatæ; ſed ve abſolutè probet
quod
aſſumpſerat, quodque aliter omninò probare nequiret.

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