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

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                <lb/>
              tangat ſuperficies internas ambarum baſium plana­
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              rum & cauam ſuperficiem curuam eiuſdem tympani:
                <lb/>
              oportet autem vt ad inſtar epiſtomij exactiſſimè dia­
                <lb/>
              phragma illud reuolutum abſque vlla rima occludat
                <lb/>
              egreſſumque impediat aquæ vel mercurio in ſemicy­
                <lb/>
              lindro FAG contento, remanente reliquo ſpatio G
                <lb/>
              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
                <lb/>
              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
                <lb/>
              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. </s>
              <s id="s.000071">&
                <lb/>
              quia horum inæqualium ponderum centrum grauita­
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              tis ſemper in aliquo puncto D intercepto inter C &
                <lb/>
              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
                <lb/>
              pendulum deſcendere deberet per arcum DE; quią
                <lb/>
              verò fluidum grauius FAG de primi non poſſet ob im­
                <lb/>
              pedimentum diaphragmatis FCG in ſitu verticali à
                <lb/>
              virtute manus retenti, ſequeretur vt vniuerſum ſe­
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              micylindricum mercurij comprimendo & calcando
                <lb/>
              curuam ſuperficiem tympani AG, quæ volubilis eſt </s>
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