Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s id="s.000293">
                <pb xlink:href="023/01/032.jpg"/>
              medis. </s>
              <s id="s.000294">ergo punctum
                <foreign lang="grc">ν</foreign>
              extra priſma af poſitum,
                <expan abbr="centrũ">centrum</expan>
                <lb/>
              erit magnitudinis
                <expan abbr="cõpoſitæ">compoſitæ</expan>
              ex omnibus priſmatibus gzr,
                <lb/>
              r
                <foreign lang="grc">β</foreign>
              t, t
                <foreign lang="grc">γ</foreign>
              x, x
                <foreign lang="grc">δ</foreign>
              k, k
                <foreign lang="grc">δ</foreign>
              y, yu, us, s
                <foreign lang="grc">α</foreign>
              h, quod fieri nullo modo po
                <lb/>
              teſt. </s>
              <s id="s.000295">eſt enim ex diffinitione centrum grauitatis ſolidæ figu
                <lb/>
              ræ intra ipſam poſitum, non extra. </s>
              <s id="s.000296">quare relinquitur, ut
                <expan abbr="cẽtrum">cen
                  <lb/>
                trum</expan>
              grauitatis priſmatis ſit in linea Km. </s>
              <s id="s.000297">Rurſus bc bifa­
                <lb/>
              riam in diuidatur: & ducta a
                <foreign lang="grc">χ,</foreign>
              per ipſam, & per lineam
                <lb/>
              agd planum ducatur; quod priſma ſecet:
                <expan abbr="faciatq;">faciatque</expan>
              in paral
                <lb/>
              lelogrammo bf ſectionem
                <foreign lang="grc">χ π</foreign>
              diuidet punctum
                <foreign lang="grc">π</foreign>
              lineam
                <lb/>
              quoque cf bifariam: & erit plani eius, & trianguli ghK
                <lb/>
              communis ſectio gu; quòd
                <expan abbr="pũctum">punctum</expan>
              u in medio lineæ hK
                <lb/>
                <figure id="id.023.01.032.1.jpg" xlink:href="023/01/032/1.jpg" number="23"/>
                <lb/>
              poſitum ſit. </s>
              <s id="s.000298">Similiter demonſtrabimus centrum grauita­
                <lb/>
              tis priſmatis in ipſa gu ineſſe. </s>
              <s id="s.000299">ſit autem planorum cfnl,
                <lb/>
              ad
                <foreign lang="grc">πχ</foreign>
              communis ſectio linea
                <foreign lang="grc">ρστ;</foreign>
              quæ quidem priſmatis
                <lb/>
              axis erit, cum tranſeat per centra grauitatis triangulorum
                <lb/>
              abc, ghk def, ex quartadecima eiuſdem. </s>
              <s id="s.000300">ergo centrum
                <lb/>
              grauitatis priſmatis af eſt punctum
                <foreign lang="grc">ς,</foreign>
              centrum ſcilicet </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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