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

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1
aqua operatur, veluti in ſiphone collocata fuiſſet.
Cap. 3. flui­
dum in ſuo
toto quie­
ſcens pon­
derat.
Cap. 3. flui­
dum in ſuo
toto quie­
ſcens pon­
derat.
PROP. XXIV.
Aqua in ipſamet aqua demerſa undiquè comprimitur ab
ambiente aqua, & vtraque grauitatem exercet.
INtra vas ABCD aqua plenum intelligatur priſma
aqueum FGHE, ductiſque planis FL, & GM pa­
rallelis horizonti.
Dico, quòd aqua FH vndique pre­
mitur ab ambiente aqua FILKG, & vtraque pondus
grauitatemque exercet.
Quia aqua FH cum aquą
ambiente ſiphonem AKD conſtituit, in quo fluidum
ſibi homogeneum agitari poteſt, & quieſcit nihilo­
minùs; ergo vna pars fluidi AK
27[Figure 27]
æquilibratur, proindequè æquè
ponderat, ac pars reliqua latera­
lis IC, portio verò aquæ FH licèt
motu careat, ſitque indifferens
ad motum ſursùm, & deorsùm,
haud inferre licet eam non exer­
cere vim ſuæ grauitatis vnà cum tota aqua ambi­
ente, quia in ſiphonis brachio AK aquæ FH ſu­
prema facies FE deorſum impelli, & comprimi de­
bet ab incumbente aqua AE, pariterque infimą
illius facies GH ſursùm impelletur à ſubiecta a­
qua GK non virtute propria, ſed eius quam exercet
pondus aquæ collateralis IM; porrò nedum aqua FH
impellitur ſurſum ab aqua ſubiecta BH, ſed etiam, vt
experientia conſtat, impulſionem, & conſtrictionem

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