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

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1
G, tunc manifeſtum eſt, terminum
46[Figure 46]
A eleuari ſursùm versùs Hab ex­
ceſſu quo vis M ſuperat faculta­
tem motiuam F, & è contrà op­
poſitus libræ terminus B depri­

metur deorsùm versùs I ab ex­
ceſſu quo pondus G ſuperat vim
grauitatis D; & quia prædicti
duo impulſus differentiales con­
trarij ſunt, vnus quidèm ſursùm̨,
alter verò deorsùm, applicanturque terminis oppoſi­
tis eiuſdem libræ; igitur ſe mutuo adiuuant promo­
uenturque, & proindè conatus, vis, atque impetus,
quo vniuerſa libra reuoluitur, æqualis erit aggrega­
to prædictarum differentiarum.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
Prop. 49.
PROP. LI.
Vis motiua, qua ſolidum grauius ſpecie, quàm fluidum, de­
ſcendit, æqualis est differentiæ ponderis ſolidi ſupra
pondus fluidi ei æqualis mole.
47[Figure 47]
HIs declaratis intelligatur
vas RGS aqua plenum, in
eoque immergatur corpus aliquod
graue durum, ac conſiſtens DE,
quod grauius ſit aqua collaterali
F patet ex dictis prop. 9. & ex
Archimede, duo pondera DE, & F collocari in libra
quadam imaginaria, & perpetua AB in qua exceſſus

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