Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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tangat ſuperficies internas ambarum baſium plana
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rum & cauam ſuperficiem curuam eiuſdem tympani:
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oportet autem vt ad inſtar epiſtomij exactiſſimè dia
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phragma illud reuolutum abſque vlla rima occludat
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egreſſumque impediat aquæ vel mercurio in ſemicy
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lindro FAG contento, remanente reliquo ſpatio G
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BF aere, vel oleo oppleto, ſitque præterea moles to
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tius tympani ſuſpenſa in ipſo axi C aflixo duobus ful
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cris vt liberè circumuolui tympanum poſſit in plano
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perpendiculari ad horizontem; tunc ſi vi manus ma
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nubrium H eique annexum diaphragma FCG perpe
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tuò in ſitu verticali ad horizontem retineretur, pro
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culdubio (dicèbat amicus) haberemus in tali caſu li
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bram radiorum æqualium perpetuam imaginariam
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ACB quæ ab inæqualibus ponderibus premeretur,
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ſcilicèt à pondere emiſphærij mercurialis vel aquei
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FAG radius CA grauaretur, dum oppoſitus radius C
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B à leuiori pondere olei, vel aeris deprimeretur. </
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quia horum inæqualium ponderum centrum grauita
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tis ſemper in aliquo puncto D intercepto inter C &
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A caderet, igitur ſemper libra AB flecti deberet de
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orſum ad partes A, vel potius conſtitueretur pendu
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lum horizontale CD ſuſpenſum in centro C & ideò
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pendulum deſcendere deberet per arcum DE; quią
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verò fluidum grauius FAG de primi non poſſet ob im
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pedimentum diaphragmatis FCG in ſitu verticali à
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virtute manus retenti, ſequeretur vt vniuerſum ſe
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micylindricum mercurij comprimendo & calcando
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curuam ſuperficiem tympani AG, quæ volubilis eſt </
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