Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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

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1
tangat ſuperficies internas ambarum baſium plana
rum & cauam ſuperficiem curuam eiuſdem tympani:
oportet autem vt ad inſtar epiſtomij exactiſſimè dia
phragma illud reuolutum abſque vlla rima occludat
egreſſumque impediat aquæ vel mercurio in ſemicy
lindro FAG contento, remanente reliquo ſpatio G
BF aere, vel oleo oppleto, ſitque præterea moles to
tius tympani ſuſpenſa in ipſo axi C aflixo duobus ful
cris vt liberè circumuolui tympanum poſſit in plano
perpendiculari ad horizontem; tunc ſi vi manus ma
nubrium H eique annexum diaphragma FCG perpe
tuò in ſitu verticali ad horizontem retineretur, pro
culdubio (dicèbat amicus) haberemus in tali caſu li
bram radiorum æqualium perpetuam imaginariam
ACB quæ ab inæqualibus ponderibus premeretur,
ſcilicèt à pondere emiſphærij mercurialis vel aquei
FAG radius CA grauaretur, dum oppoſitus radius C
B à leuiori pondere olei, vel aeris deprimeretur. &
quia horum inæqualium ponderum centrum grauita
tis ſemper in aliquo puncto D intercepto inter C &
A caderet, igitur ſemper libra AB flecti deberet de
orſum ad partes A, vel potius conſtitueretur pendu
lum horizontale CD ſuſpenſum in centro C & ideò
pendulum deſcendere deberet per arcum DE; quią
verò fluidum grauius FAG de primi non poſſet ob im
pedimentum diaphragmatis FCG in ſitu verticali à
virtute manus retenti, ſequeretur vt vniuerſum ſe
micylindricum mercurij comprimendo & calcando
curuam ſuperficiem tympani AG, quæ volubilis eſt

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