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

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            <p type="main">
              <s id="s.000102">
                <pb pagenum="19" xlink:href="010/01/027.jpg"/>
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              Cap. 2. dę
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              momentis
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              grauium in
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              fluido inna­
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              tantium</s>
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            <p type="main">
              <s id="s.000104">SIt pondus A maius, B verò minus alligata extre­
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              mitatibus funis ADB, qui ſupponatur omninò
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              grauitate carere, & reuoluatur circa trochleam CDE
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              conuertibilem circa axim fixum F. patet quòd funes
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              AC, & BE perpendiculariter ad ho­
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                <figure id="id.010.01.027.1.jpg" xlink:href="010/01/027/1.jpg" number="10"/>
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              rizontem CE prementes, & extenſi
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              contingunt peripheriam rotæ in ter­
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              minis oppoſitis C, & E eiuſdem dia­
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              metri, ſeu libræ horizontalis, ergo
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              funes CA, & EB ſunt inter ſe paralle­
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              li;
                <expan abbr="coniũgatur">coniungatur</expan>
              poſtea recta linea AB,
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              ſeceturque bifariam in G, & vt pon­
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              dus A ad B ita fiat diſtantia BI ad IA
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                <expan abbr="manifeſtũ">manifeſtum</expan>
              eſt (ex mechanicis) punc­
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              tum I eſſe centrum grauitatis com­
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              munis duorum colligatorum ponde­
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              rum A & B, funis enim hanc propor­
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              tionem non alterat, cùm nullius gra­
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              uitatis ſupponatur: aſcendat poſtea
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              pondus minus B vbicumque ad L, & deprimatur ma­
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              ius pondus A vſque ad K. dico quod ambo in com­
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              muni centro grauitatis deſcendunt circa libræ cen­
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              trum, ſeu fulcimentum ſtabile G motu directo, & per­
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              pendiculari ad horizontem. </s>
              <s id="s.000105">
                <expan abbr="coniũgatur">coniungatur</expan>
              recta lineą
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              KL quia funis ADB æqualis, imò idem eſt, quàm K
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              DL, igitur ablato communi ADL erit deſcenſus AK
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              æqualis aſcenſui BL; quare in triangulis ſimilibus
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              ob æquidiſtantiam laterum AK & BL homologorum
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              vt AK ad BL ita erit AG ad GB & ita pariter KML </s>
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