Ceva, Giovanni, Geometria motus, 1692

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              to F motu compoſito currens; verùm quia quadratum ex
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              PR ęquatur rectangulo ORQ vnà cum quadrato ex PQ, &
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              eſt ob hyperbolam rectangulum ORQ æquale quadrato
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              ex HI, vel PK; ergo PR quadratum æquale erit duobus ſi­
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              mul quadratis PQ, PK; itaque PR erit gradus velocitatis
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              prædicti mobilis in F momento P, compoſitoque motu
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              currentis iuxta curuam parabolicam. </s>
              <s id="s.000503">Pariter momento
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              M, cum mobile eſſet in D velocitas compoſiti motus foret
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              MS poteſtate æqualis duabus MT, ML, ac demum in A
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              initio motus velocitas eſt HI: quare HISM erit imago ve­
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              locitatis motus compoſiti dum mobile punctum deſcripſe­
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              rit curuam parabolicam AFD, eſtque illa imago imagini­
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              bus diuiſorum, ſeu ſimplicium, motuum homogenea; ergo
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              conſtat baſim etiam BD ad parabolam AFD eandem ha­
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              bere rationem, quam rectangulum HILM ad quadrili­
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              neum HISM. </s>
              <s id="s.000504">Quod &c. </s>
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            <p type="margin">
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              Def.
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              7.
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              primi
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              & pr.
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              12.
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              pri­
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              mi huius.
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            <p type="margin">
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              Cor. </s>
              <s id="s.000507">pr.
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              4.
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              hu.
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              </s>
            </p>
            <p type="margin">
              <s id="s.000508">
                <margin.target id="marg111"/>
                <emph type="italics"/>
              Pr.
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              2.
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              primi
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              huius.
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              </s>
            </p>
            <p type="margin">
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              Ex pr.
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              12.
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              hu.
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              </s>
            </p>
            <p type="margin">
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                <margin.target id="marg113"/>
                <emph type="italics"/>
              Pr.
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              3.
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              huius.
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              </s>
            </p>
            <p type="margin">
              <s id="s.000511">
                <margin.target id="marg114"/>
                <emph type="italics"/>
              Pr.
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              11.
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              l.
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              2.
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              co­
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              nic.
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              </s>
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            <p type="margin">
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              Def.
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              3.
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              prima
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              huius.
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            <p type="main">
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              Corollarium. I.
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                <emph.end type="center"/>
              </s>
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              Patet, cum latera compoſiti motus ſint duo, & ſibi ipſis per­
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              pendicularia, tunc gradum velocitatis eìuſdem motus compo­
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              ſiti æqualem eſſe potentiâ duobus ſimul gradibus, quos habet
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              mobile eodem momento, ac ſi ſeorſim intelligatur in ipſis ferri
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              lateribus.
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              Corollarium. II.
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                <emph.end type="center"/>
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              Si verò conſiderentur imagines primi ſecundique Caſus
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              interſe homogenea, erit vt quadrilineum HISM primi ad
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              quadrilineum ijſdem literis notatum ſecundi caſus, vt cur­
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              ua illa parabolica ad hanc ſecundi caſus parabolam.
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              </s>
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