Commandino, Federico, Liber de centro gravitatis solidorum, 1565
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              centrum z: parallelogrammi ad,
                <foreign lang="grc">θ·</foreign>
              parallelogrammi fg,
                <foreign lang="grc">φ·</foreign>
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              parallelogrammi dh,
                <foreign lang="grc">χ·</foreign>
              &
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              parallelogrammi cg
                <expan abbr="centrũ">centrum</expan>
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                <foreign lang="grc">ψ·</foreign>
              atque erit
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              punctum me
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              dium uniuſcuiuſque axis, ui
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              delicet eius lineæ quæ oppo
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              ſitorum
                <expan abbr="planorũ">planorum</expan>
              centra con
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              iungit. </s>
              <s id="s.000261">Dico
                <foreign lang="grc">ω</foreign>
              centrum eſſe
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              grauitatis ipſius ſolidi. </s>
              <s id="s.000262">eſt
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              enim, ut demonſtrauimus,
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              ſolidi af centrum grauitatis
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              in plano Kn; quod oppoſi­
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              tis planis ad, gf æquidiſtans
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              reliquorum planorum late­
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              ra bifariam diuidit: & ſimili
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              ratione idem centrum eſt in plano or, æquidiſtante planis
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              ae, bf oppoſitis. </s>
              <s id="s.000263">ergo in communi ipſorum ſectione: ui­
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              delicet in linea yz. </s>
              <s id="s.000264">Sed eſt etiam in plano tu, quod
                <expan abbr="quidẽ">quidem</expan>
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              yz ſecatin
                <foreign lang="grc">ω.</foreign>
              Conſtat igitur centrum grauitatis ſolidi eſſe
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              punctum
                <foreign lang="grc">ω,</foreign>
              medium ſcilicet axium, hoc eſt linearum, quæ
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              planorum oppoſitorum centra coniungunt.</s>
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              6 huius</s>
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              <s id="s.000266">Sit aliud prima af; & in eo plana, quæ opponuntur, tri­
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              angula abc, def:
                <expan abbr="diuiſisq;">diuiſisque</expan>
              bifariam parallelogrammorum
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              lateribus ad, be, cf in punctis ghk, per diuiſiones
                <expan abbr="planũ">planum</expan>
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              ducatur, quod oppoſitis planis æquidiſtans faciet
                <expan abbr="ſectionẽ">ſectionem</expan>
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              triangulum ghx æquale, & ſimile ipſis abc, def. </s>
              <s id="s.000267">Rurſus
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              diuidatur ab bifariam in l: & iuncta cl per ipſam, & per
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              cKf planum ducatur priſma ſecans, cuius, &
                <expan abbr="parallelogrã">parallelogram</expan>
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              mi ae communis ſectio ſit lmn. </s>
              <s id="s.000268">diuidet punctum m li­
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              neam gh bifariam; & ita n diuidet lineam de: quoniam
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              triangula acl, gkm, dfn æqualia ſunt, & ſimilia, ut ſupra
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              demonſtrauimus. </s>
              <s id="s.000269">Iam ex iis, quæ tradita ſunt, conſtat cen
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              trum grauitatis priſmatis in plano ghk contineri. </s>
              <s id="s.000270">Dico
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              ipſum eſſe in linea km. </s>
              <s id="s.000271">Si enim fieri poteſt, ſit o centrum; </s>
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