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

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1
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
PROP. LXXIV.
Si fluidum ſponte à virtute intrinſeca intra aliud fluidum
diuerſæ conſistentiæ moueatur, in parte poſteriori, ſeù
termino à quo, ſui motus, non erit excauatum,
ſed tumidam, & conuexam figuram
acquiret.
SVpponamus ſecundo loco fluidum
57[Figure 57]
ABC, quod ſit aqua, grauius eſſę
ambiente fluido (quod ſit v. g. oleum)
manifeſtum eſt aquam ABCH deorsùm
in oleo deſcendere ab I versùs E ab in­
trinſeco principio ſuæ grauitatis impnl­
ſum.
Dico iam quod eadem aqua in par­
te poſtica ſui motus H, ſcilicèt versùs
terminum à quo ſui motus, non erit ex­
cauata ad modum ſcutellæ, ſed tumida, & conuexa
erit.
Quia cum primo aqua ABCH demergitur in­
fra olei libellam RX, & inchoat proſequiturque ſuum
deſcenſum, neceſsè eſt vt oleum ſubiectum AEC è ſuo
loco continenter recedat, & recurrat ad replen­
dum locum poſticum AMKC ab aqua derelictum; er­
go aqua AHCB, & oleum ambiens motibus contra­
rijs agitari debent, nempe aqua deſcendet dum am­
biens oleum aſcendit, igitur ratione motus, oleum̨
poſticè recurrens non impellet aquam ictum fugien­
tem, nec proinde eius figuram AHC contundere, &
explanare poterit.
præterea aqua ABCH habet vim

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