Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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      <text>
        <body>
          <chap>
            <p type="main">
              <s id="s.000330">
                <pb pagenum="14" xlink:href="023/01/035.jpg"/>
              ſimiliter demonſtrabitur totius priſmatis aK grauitatis ef
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              ſe centrum. </s>
              <s id="s.000331">Simili ratione & in aliis priſmatibus illud
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              idem facile demonſtrabitur. </s>
              <s id="s.000332">Quo autem pacto in omni
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              figura rectilinea centrum grauitatis inueniatur, docuimus
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              in commentariis in ſextam propoſitionem Archimedis de
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              quadratura parabolæ.</s>
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            <p type="main">
              <s id="s.000333">Sit cylindrus, uel cylindri portio ce cuius axis ab: ſece­
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                <expan abbr="turq,">turque</expan>
              plano per axem ducto; quod ſectionem faciat paral­
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              lelogrammum cdef: & diuiſis cf, de bifariam in punctis
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                <figure id="id.023.01.035.1.jpg" xlink:href="023/01/035/1.jpg" number="26"/>
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              gh, per ea ducatur planum baſi æquidiſtans. </s>
              <s id="s.000334">erit ſectio gh
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              circulus, uel ellipſis, centrum habens in axe; quod ſit K at­
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                <arrow.to.target n="marg45"/>
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              que erunt ex iis, quæ demonſtrauimus, centra grauitatis
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              planorum oppoſitorum puncta ab: & plani gh ipſum k in
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              quo quidem plano eſt centrum grauitatis cylindri, uel cy­
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              lindri portionis. </s>
              <s id="s.000335">Dico punctum K cylindri quoque, uel cy
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              lindri portionis grauitatis centrum eſſe. </s>
              <s id="s.000336">Si enim fieri po­
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              teſt, ſit l centrum:
                <expan abbr="ducaturq;">ducaturque</expan>
              kl, & extra figuram in m pro­
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              ducatur. </s>
              <s id="s.000337">quam ucro proportionem habet linea mK ad kl </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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