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

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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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