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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              <pb o="9" file="0021" n="21"/>
              <figure xlink:label="fig-0021-01" xlink:href="fig-0021-01a" number="8">
                <image file="0021-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/PVNDER1Y/figures/0021-01"/>
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            circularis P M R, erit æqualis armillæ circulari
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            Hk O. </s>
            <s xml:id="echoid-s251" xml:space="preserve">Cum verò punctum L, ſumptum ſit arbi-
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            trariè, ſequitur omnes armillas differentiæ cono-
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            rum, æquales eſſe omnibus armillis differentiæ co-
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            noideorum. </s>
            <s xml:id="echoid-s252" xml:space="preserve">Ergo & </s>
            <s xml:id="echoid-s253" xml:space="preserve">differentia conorum erit æqua-
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            lis differentiæ conoideorum.</s>
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            <s xml:id="echoid-s255" xml:space="preserve">Sicuti autem probatum eſt totasillas differentias
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            æquales eſſe, ſic probari poteſt quaslibet ipſarum
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            partes proportionales item fore æquales. </s>
            <s xml:id="echoid-s256" xml:space="preserve">v. </s>
            <s xml:id="echoid-s257" xml:space="preserve">g. </s>
            <s xml:id="echoid-s258" xml:space="preserve">ſi in-
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            telligatur ductum planum H O, probari poteſt eo-
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            dem modo, partem differentiæ conoideorum </s>
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