Angeli, Stefano degli, Miscellaneum hyperbolicum et parabolicum : in quo praecipue agitur de centris grauitatis hyperbolae, partium eiusdem, atque nonnullorum solidorum, de quibus nunquam geometria locuta est, parabola nouiter quadratur dupliciter, ducuntur infinitarum parabolarum tangentes, assignantur maxima inscriptibilia, minimaque circumscriptibilia infinitis parabolis, conoidibus ac semifusis parabolicis aliaque geometrica noua exponuntur scitu digna

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            <s xml:id="echoid-s368" xml:space="preserve">
              <pb o="17" file="0029" n="29"/>
              <figure xlink:label="fig-0029-01" xlink:href="fig-0029-01a" number="12">
                <image file="0029-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/PVNDER1Y/figures/0029-01"/>
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            dium ipſius B D, ſit centrum grauitatis exceſſus co-
              <lb/>
            noidis parabolici E B F, ſupra conum E B F; </s>
            <s xml:id="echoid-s369" xml:space="preserve">ſe-
              <lb/>
            quitur etiam centrum grauitatis exceſſus conoidis
              <lb/>
            A B C, ſupra ſuum conum eſſe in medio ipſius
              <lb/>
            B D.</s>
            <s xml:id="echoid-s370" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s371" xml:space="preserve">Quod vero centrum grauitatis exceſſus conoidis
              <lb/>
            parabolici E B F, ſupra ſuum conum ſit medium
              <lb/>
            punctum ipſius B D, patet. </s>
            <s xml:id="echoid-s372" xml:space="preserve">Quia P, centrum
              <lb/>
            grauitatis conoidis diuidit B D, vt B P, ſit ad
              <lb/>
            P D, vt 2, ad 1, ſeù vt 8. </s>
            <s xml:id="echoid-s373" xml:space="preserve">ad 4. </s>
            <s xml:id="echoid-s374" xml:space="preserve">N, verò cen-
              <lb/>
            trum grauitatis coni diuidit B D, ſic, vt B N, ſit
              <lb/>
            ad N D, vt 3. </s>
            <s xml:id="echoid-s375" xml:space="preserve">ad 1. </s>
            <s xml:id="echoid-s376" xml:space="preserve">ſeù vt 9. </s>
            <s xml:id="echoid-s377" xml:space="preserve">ad 3. </s>
            <s xml:id="echoid-s378" xml:space="preserve">Ergo </s>
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