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. XV.
Alia ratione, & experimento probare compresſionem par­
tium aquæ, & rerum in ea contentarum à pon­
dere ipſiuſmet aquæ.
SIt fiſtula vitrea RVX vndique clauſa præterquam
in ſupremo orificio R, hæc verò aqua repleatur,
& in ea ampullula vitrea AD immerga­
19[Figure 19]
tur ſitque ea plena aere, & eius pars ver­
ſus infimum orificium apertum D graui­
or ſit, ad hoc vt ampullula AD ſemper
inuerſo ſitu in ipſa aqua perſiſtat.
in hac
machina obſeruatur quòd vexica vitrea
AD quò magis deprimitur infra ſupre­
mam aquæ libellam, vel potiùs ipſamet
aqua altiùs infunditur, & eleuatur, tune
eò magis aer in ampulla contentus con­
denſatur, atque in minori ſpatio conſtrin­
gitur, & hoc fenſu ipſo patet dum aquą
ingreditur per orificium D atque colli
ampullæ particulam aliquam implet; quod verò hu­
iuſmodi aeris reſtrictio ſit effectus ponderis aquæ ſu­
premæ comprimentis ſenſu ipſo dignoſcitur, nam quò
magis aquæ ſuprema ſuperficies S eleuatur versùs R
ſemper magis, ac magis ſucceſſiuè aeris moles præ­
dicti tubuli conſtringitur ſubintrando nimirùm aqua
magis à C versùs B.
Quòd verò hoc dependeat à con­
preſſione
multiplicati ponderis aquæ ſubleuatæ alià

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