Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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    <archimedes>
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        <body>
          <chap>
            <p type="main">
              <s id="s.000463">
                <pb xlink:href="023/01/052.jpg"/>
              mus: erit utique grauitatis centrum pyramidis punctum
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              g. in quo ſcilicet ipſi axes conueniunt.</s>
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            <p type="head">
              <s id="s.000464">THEOREMA XIIII. PROPOSITIO XVIII.</s>
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            <p type="main">
              <s id="s.000465">SI ſolidum parallelepipedum ſecetur plano
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              baſibus æquidiſtante; erit ſolidum ad ſolidum,
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              ſicut altitudo ad altitudinem, uel ſicut axis ad
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              axem.</s>
            </p>
            <figure id="id.023.01.052.1.jpg" xlink:href="023/01/052/1.jpg" number="42"/>
            <p type="main">
              <s id="s.000466">Sit ſolidum parallelepipe
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              dum abcdefgh, cuius axis
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              kl:
                <expan abbr="ſeceturq;">ſeceturque</expan>
              plano baſibus
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              æquidiſtante, quod faciat
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              ſectionem mnop; & axi in
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              puncto q occurrat. </s>
              <s id="s.000467">Dico
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              ſolidum gm ad ſolidum mc
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              eam proportionem habere,
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              quam altitudo ſolidi gm ha­
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              bet ad ſolidi mc altitudi­
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              nem; uel quam axis kq ad
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              axem ql. </s>
              <s id="s.000468">Si enim axis Kl ad
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              baſis planum ſit perpendicu
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                <figure id="id.023.01.052.2.jpg" xlink:href="023/01/052/2.jpg" number="43"/>
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              laris, & linea gc, quæ ex quin
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              ta huius ipſi kl æquidiſtat,
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              perpendicularis erit ad
                <expan abbr="idẽ">idem</expan>
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              planum, & ſolidi altitudi­
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                <arrow.to.target n="marg50"/>
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              nem dimetietur. </s>
              <s id="s.000469">Itaque ſo­
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              lidum gm ad ſolidum mc
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              eam proportionem habet,
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              quam parallelogramm
                <expan abbr="ũ">um</expan>
              gn
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              ad parallelogrammum nc,
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                <arrow.to.target n="marg51"/>
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              hoc eſt quam linea go, quæ </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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