Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s id="s.000170">
                <pb pagenum="6" xlink:href="023/01/019.jpg"/>
                <figure id="id.023.01.019.1.jpg" xlink:href="023/01/019/1.jpg" number="11"/>
                <lb/>
              habebit maiorem
                <expan abbr="proportionẽ">proportionem</expan>
              ,
                <lb/>
              quam cb ad ba. </s>
              <s id="s.000171">fiat ob ad ba,
                <lb/>
              ut figura rectilinea ad portio­
                <lb/>
              nes. </s>
              <s id="s.000172">cum igitur à circulo, uel el­
                <lb/>
              lipſi, cuius grauitatis centrum
                <lb/>
              eſt b, auferatur figura rectilinea
                <lb/>
              efghklmn, cuius centrum a;
                <lb/>
              reliquæ magnitudinis ex portio
                <lb/>
                <arrow.to.target n="marg23"/>
                <lb/>
              nibus compoſitæ centrum graui
                <lb/>
              tatis erit in linea ab producta,
                <lb/>
              & in puncto o, extra figuram po
                <lb/>
              ſito. </s>
              <s id="s.000173">quod quidem fieri nullo mo
                <lb/>
              do poſſe perſpicuum eſt. </s>
              <s id="s.000174">ſequi­
                <lb/>
              tur ergo, ut circuli & ellipſis cen
                <lb/>
              trum grauitatis ſit punctum a,
                <lb/>
              idem quod figuræ centrum.</s>
            </p>
            <p type="margin">
              <s id="s.000175">
                <margin.target id="marg21"/>
              8. quinti</s>
            </p>
            <p type="margin">
              <s id="s.000176">
                <margin.target id="marg22"/>
              19. quinti
                <lb/>
              apud
                <expan abbr="Cãpanum">Cam
                  <lb/>
                panum</expan>
              .</s>
            </p>
            <p type="margin">
              <s id="s.000177">
                <margin.target id="marg23"/>
              8. Archi­
                <lb/>
              medis.</s>
            </p>
            <p type="head">
              <s id="s.000178">ALITER.</s>
            </p>
            <p type="main">
              <s id="s.000179">Sit circulus, uel ellipſis abcd,
                <lb/>
              cuius diameter db, & centrum e:
                <expan abbr="ducaturq;">ducaturque</expan>
              per e recta li
                <lb/>
              nea ac, ſecans ipſam db ad rectos angulos. </s>
              <s id="s.000180">erunt adc,
                <lb/>
              abc circuli, uel ellipſis dimidiæ portiones. </s>
              <s id="s.000181">Itaque quo­
                <lb/>
                <figure id="id.023.01.019.2.jpg" xlink:href="023/01/019/2.jpg" number="12"/>
                <lb/>
              niam por
                <lb/>
                <expan abbr="tiõis">tionis</expan>
              adc
                <lb/>
                <expan abbr="cẽtrũ">centrum</expan>
              gra­
                <lb/>
              uitatis eſt
                <lb/>
              in diame­
                <lb/>
              tro de: &
                <lb/>
              portionis
                <lb/>
              abc cen­
                <lb/>
              trum eſt
                <expan abbr="ĩ">im</expan>
                <lb/>
              ipſa eb: to
                <lb/>
              tius circu
                <lb/>
              li, uel ellipſis grauitatis centrum erit in diametro db. </s>
              <lb/>
              <s id="s.000182">Sit autem portionis adc
                <expan abbr="cẽtrum">centrum</expan>
              grauitatis f: & ſumatur </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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