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

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1
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
Et hinc apertè conijcio non benè perceptum fuiſ­
ſe modum quomodò medium fluidum ſursùm impel­
lat extrudatque lignum minùs graue ipſa aqua, & ideò
operæpretium erit apertè, & diſtinctè hoc declarare.
PROP. LXXX.
Niſi lignum, & ambiens aqua collateralis motibus contra­
rijs ſursùm, & deorsùm ſimul tempore moueri que­
ant, numquam lignum in aqua aſcendet.
61[Figure 61]
SIt vas ABCD aqua plenum iņ
cuius fundo apponatur priſma
ligneum EFGB hìc adeſt aqua li­
gno incumbens AEFH, atque aqua
collateralis HFID, quæ comprimit
ſubiectum aqueum priſma FICG,
Dico primò, quod ſuperincumbens
aqua AEFH nequaquàm ſursùm impellit ſubiectum
lignum, imò id comprimit: neque præterea ſuperna
collateralis aqua HFID prædictum lignum eleuat,
ſed tantummodò æquilibratur cum collaterali aqua
AEFH.
Tantummodò ad rem noſtram facit aquą,
quæ ad latus ipſius ligni apponitur, FGCI, & hæc non
ſemper ſubleuare poteſt lignum BF, niſi habuerit
duas conditiones, primò vt aqua FC deſcenderę
deorsùm valeat, ſecundò vt eodem tempore eadem
aqua lignum GE impellere ſursùm poſſit.
At quan­
dò huiuſmodi motus contrarij ob aliquod impedi­
mentum fieri ſimùl non poſſunt, omninò lignum quie-

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