Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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        <body>
          <chap>
            <pb xlink:href="063/01/040.jpg"/>
            <p type="main">
              <s>
                <emph type="center"/>
              THEOREMA IX.
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>
                <emph type="italics"/>
              Impulſus quieſcens eſt æqualis reliquo ſegmento, quod abſcindit hy­
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              pomochlium à ſemidiametro figuræ motûs.
                <emph.end type="italics"/>
              </s>
            </p>
            <figure id="id.063.01.040.1.jpg" xlink:href="063/01/040/1.jpg" number="12"/>
            <p type="main">
              <s>Quia impulfus mouens & quieſcens ſimul ſumpti, toti impul­
                <lb/>
              ſui, hic autem ſemidiametro figuræ motus AC ponitur æqua­
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              lis per Axioma 2: Eſt veró impulſus movens æqualis uni ſe­
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              gmento AD per theorema 8. erit
                <expan abbr="quoq;">quoque</expan>
              impulſus quieſcens
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              æqualis alteri ſegmento DC. </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
              LEMMA.
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
                <emph type="italics"/>
              Centrum grauitatis cuius〈que〉 figuræ rectilineæ invenire.
                <emph.end type="italics"/>
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s>Sit primùm in triangulo iſopleuro ABC inquirendum cen­
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              trum grauitatis. in quo ex duobus angulis B & C demittantur
                <lb/>
              lineæ ad baſim rectæ BD CE. </s>
              <s>Dico in communi illarum ſecti­
                <lb/>
              one F eſſe centrum grauitatis. </s>
              <s>Quia enim recta BD ſecat ba­
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              ſim mediam; eritineâ centrum grauitatis, per prop. 13 lib. 1
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              Archimedis de æquipond. </s>
              <s>Eſt verò idem in recta CE: igitur in
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              communi ſectione F. </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>