Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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

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1
portio K grauitas abſoluta pilæ aqueæ C quæ æqua
lis ſit ipſi AB, ſit que pila C contenta intra eiuſdem̨
aquæ RO profunditatem, vel in altera fiſtula inuerſi
ſiphonis, quæ cum reliqua continuetur, poſtea eadem
pila AB filo DA ab aliqua potentia I ſuſpenſa in me
dio aquæ fixè retineatur. modò ſi poſſibile eſt pilą
aquea C nil prorsùs ponderet in ipſamet aqua, igitur
in ſiphone, vel in libra DE in eius puncto medio F
fulta pila aquea C ſuſpenſa à termino E, quæ nullam
prorſus grauitatem exercere in aqua ſupponitur, nun
quam imminuet pondus contrapoſitæ pilæ AB colli
gatæ termino libræ D, propterea quòd nihilum ab
aliquo pondere ſubtractum ipſum nullo pacto immi
nuit; nec pariter denſitas, & tenacitas aquæ gradum
ponderis pilæ AB diminuere poteſt, propterea quòd
illa reſiſtentia potis eſt retardare, & impedire mo
tum, non autem vim, quam graue AB in quiete con
ſtitutum exercet comprimendo; videmus enim, quòd
pila ferrea quieſcens ſiue fulciatur à molli cera, ſiue
à rigido adamante, ſemper eadem vi comprimit, ſci
licet menſurata à gradu eius ponderis.

Cap. 3. flui
dum in ſuo
toto quie
ſcens pon
derat.

21[Figure 21]

His poſitis ſequitur, quòd pila fer
rea AB pendula intra aquam exerce
bit integram ſuam grauitatem IK,
ſcilicet eam, quam in aere exerce
bat, ſed hoc eſt falſum, imminuitur
enim præcisè pro menſura ponderis
K ſcilicet molis aqueæ C, & ei relin
quitur tantummodò pondus I, ſcili-

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