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

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1
35[Figure 35]
cidit præcisè in recta linea MI
perpendiculari ad horizontem,
quæ per centrum ſuſpenſionis
ducitur.
Modò agitetur aqua va­
ſis, vt nimirùm pars EF deſcen­
dat, pars verò KG, ſursùm ten­
dat, & hoc per aliquod tempus
perſeueret continuatis reuolu­
tionibus, dummodò planities libellæ, AD non alte­
retur; frigitur verum eſt in tali caſu, quòd grauitas
aſcendentis aquæ KG deſtruitur quatenus à virtute
impulſiua proiectitia ſursùm impellitur, & è contrà
ſi grauitas, & impetus aquæ deſcendentis EF dupli­
catur, quia eius ponderi ſuperadditur vis proiectiuą
deorsùm, igitur medietas vaſis MAB, aut leuis effi­
cietur, aut valdè eius grauitas priſtina imminutą
erit, & è contrà reliqua vaſis medietas MDC
duplò grauior facta erit, proindeque terminus
libræ L deprimetur, eleuabiturque oppoſitus ter­
minus libræ H, quod tamen falſum eſt, igitur quo­
modocumque aqua agitetur, dum in ipſamet aqua, &
in proprio loco continetur, neque amittit ob aſcen­
ſum, nec acquirit ob deſcenſum nouam grauitatem̨.
Cap. 3. flui­
dum in ſuo
toto quie­
ſcens pon­
derat.
Sed faciliùs hoc experieris, ſi intra vas ABCD in­
ſeratur rota EGKF perpendicularitèr horizonti ere­
cta, & parietibus oppoſitis vaſis infixo axe eius iņ
M vt facilè rota conuerti poſſit.
Et ſiquidem centrum
grauitatis totius aggregati cadit in recta lineą
IM perpendiculari ad horizontem, tunc ſiue rotą

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