Ceva, Giovanni, Geometria motus, 1692

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              Illud quoque hac occaſione aperiendum eſt, graue naturali­
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              ter deſcendens eò concitatiùs ferri, quoad potentia reſiſtentis
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              aeris (validior namque iſta fit, vbi mobilis caſus eſt celerior)
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              vi grauitatis mobili inhærenti exaquatur, tunc enim cauſą
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              vlterioris accelerationis adempta eſt, conſumiturque in lucta­
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              tione aeris contranitentis: quare tunc grane progrederetur
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              æquabili motu, id quòd citiùs euenire deberet ſi grane intrą
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              aquam deſcendat.
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            <p type="main">
              <s id="s.000361">
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              PROP. II. THEOR. II.
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              <s id="s.000362">SI in eadem recta duos motus ſibi contrarios, ſimplices,
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              ac eodem tempore peractos intelligamus, mobile di­
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              ferentiam illorum ſpatiorum, ſi vtroque motu eſſet affe­
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              ctum, percurreret.
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              Tab.
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              4.
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              Fig.
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              2.</s>
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              <s id="s.000364">Curratur à puncto L ſpatium LO imagine velocitatum
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              ABFG, & codem tempore curratur etiam recta OM ex
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              puncto altero O, ſcilicet contrario motu, & iuxta
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              AHIG prædictę homogeneam. </s>
              <s id="s.000365">Dico mobile,
                <expan abbr="cõpoſito">compoſito</expan>
              ex
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              vtriſque motu, & tempore ipſo AG curſurum differentiam
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              LM dictorum ſpatiorum LO, OM. </s>
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              <s id="s.000366">Primùm intra parallelas AB, GF non ſe ſecent lineæ
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              BF, HI, & ducatur quælibet DC æquidiſtans AB, vel GF,
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              quæ fecet HI in E. </s>
              <s id="s.000368">Manifeſtum eſt, mobile, compoſito
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              motu feratur habere duplicem velocitatem, vnam AB al­
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              teram illi oppoſitam AH, ob idque moueri verſus O ſolą
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              velocitate HB differentia dictarum interſe pugnantium
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              velocitatum: pariter momento D feretur mobile veloci­
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              tate EC differentia duarum DE, DC, & inſtanti G habebit
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              differentialem IF; ex quo ſequitur figuram BHEIFCB, dif­
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              ferentiam imaginum ABFG, HAGI, aptatam tempori AC
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              imaginem eſſe velocitatum compoſiti motus. </s>
              <s id="s.000369">Hoc po­
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              ſito habebit LM ad LO eandem rationem, ac BHIF ad
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              ABFG; Propterea LM, quæ eſt differentia ſpatiorum LO, </s>
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          </chap>
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