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

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1
habebant; ſed hinc non licet inferre, ſupremam la­
nam dum mouetur grauitatem exercere, quia illą
conſtipatio non dependet ab actione grauitatis in­
cumbentis lanæ quæ actio perſeueret exerceaturque
tempore deſcenſus, ſed illa conſtipatio eſt effectus
compreſſionis in præcedenti quiete factæ, in actu e­
nim deſcenſus nullo pacto impellere poteſt ſuprema
lana ſubiectam pani velocitate ictum fugientem, &
ideo ſuper eam minimè pondus exercebit.
Cap. 3. flui­
dum in ſuo
toto quie­
ſcens ponde­
rat.
PROP. XXI.
Aqua deſcendens per aerem, nullam grauitatem habet, &
ſolummodò eam exercet, quando quieſcit ſuper
aquam.
SImili modo aqua non deſcendit, quando fulci­
tur à ſuperficie terræ, & maris, ſed quando
extra ſuum locum peregrinatur, & mouetur, vt iņ
aere, & tunc ſi conſideretur cylindrus aqueus per ae­
rem deſcendens, diuidaturque in partes æquales à
planis horizonti æquidiſtantibus; quia partes æqua­
les eiuſdem aquæ ſunt æquè graues, habent impe­
tus æquales à natura ſibi aſſignatos quibus deſcen­
dere deorſum nituntur, igitur pars ſuprema eiuſdem
cylindri aquei æquè velox erit, ac pars ei ſubiecta,
igitur ſuprema non poterit impellere, vel compri­
mere aquam ei ſubiectam, cùm æquali velocitatę
hęc ictum, & percuſſionem fugiat cum quanta à ſu­
perincumbente inſectatur perſequiturque, ſicuti

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