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

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1
Cap. 3. flui­
dum in ſuo
toto quie­
ſcens pon­
derat.
PROP. XXXI.
Diuiſio quæ effici poteſt à compresſione inſtrumenti non acu­
ti, veluti eſt malleus, paritèr ad cunei actionem
reducitur.
QVandoquidem particulę corporis à malleo con­
preſſæ inſinuantur directè, promouenturque
intra alias collaterales particulas, & quia in­
ſinuatio prædictarum partium effici non poteſt niſi
collaterales particulæ non contuſæ locali motu late­
rali tranſportentur, hinc fit, quòd particulæ illæ con­
preſſæ immediatè actionem cunei referant: malleus
verò ſit inſtrumentalis cauſa mediata, ſeù potiùs vir­
tus impellens particulas compreſſas, cuneos refe­
rentes.
PROP. XXXII.
Veſica arena, vel aqua repleta vndique, & in omni­
bus partibus eius ab innumeris cuneis compreſſaneque
ſcindi, neque flecti, neque figuram commu­
tare poteſt.
SVpponatur modò veſica ABCD, quæ repleatur
aqua, vel hydrargyro, aut arena, vel globulis
cryſtallinis minutiſſimis, tunc ſi huiuſmodi veſica à
pauimento RS fulciatur, atque ei ſuperponatur acies
ſecuris, vel nouaculæ I, procùl dubio, aut veſicą
ſcindetur, aut ſaltèm fluidum, ſiue arena contentą

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