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

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1
ſupra nihilum, ſeù ſupra vacuum eminet, eodem modo,
ac id, quod linea palmaris nihilum ſuperat, vel ſupra
id eminet, nil aliud planè eſt, quàm entitas finitą
eiuſdem lineæ palmaris.
Cap. 10. de
æquitempo­
ranea natu­
rali veloci­
tate grauium.
PROP. CCV.
Hoc poſito ostendemus velocitatem cuiuslibet corporis gra­
uis in vacuo eſſe finitam, & in tempore abſolui.
SI enim fieri poteſt mobile A in vacuo infinitą
velocitate BC moueatur, & quia non alia de cau­
ſa in aere corpus A tardiùs mouetur,
148[Figure 148]
niſi quia aer pro menſura eius denſi­
tatis impedit, & retardat eam velo­
citatem, quam aptum natum eſt exer­
cere idem corpus A, remotis omnibus
impedimentis; eſtque aeris denſitas
finita, ideoque reſiſtentia, & retar­
datio erit quid finitum; ſit illa BE,
ergo ab abſoluta, & totali velocita­
te BC ablata retardatione BE rema­
nebit velocitas EC, qua per aerem mouebitur corpus
prædictum; ſed ab infinita velocitate BC ablata fini­
ta velocitate retardationis BE, remanebit adhùc infi­
nita velocitas EC, quare corpus A in aere mouebitur
infinita velocitate EC, quod eſt abſurdum, conſtat
enim per aerem velocitate finita, & temporanea mo­
ueri: qua propter in vacuo non mouebitur infinitą,
ſeù inſtantanea velocitate, quod fuerat oſtendendum.

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