Ceva, Giovanni, Geometria motus, 1692

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              <s id="s.000316">
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                <emph type="italics"/>
              quadratum ex FG ad quadratum ex IH vt quadratocubus
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              ex FK ad quadratocubum ex IK, fuit equidem in hyperbolą
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              quadratoquadratocubus ex DC
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              quadratoquadratocubum
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              ex AB ſicut quadratocubus ex AE ad ſimilem poteſtatem ex
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              DE, ſcilicet inuariata poteſtate abſerſarum in ambabus au­
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              uerſis. </s>
              <s id="s.000317">Quare ex poteſtatibus notis vnius auuerſarum fa­
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              cilè inoteſcent poteſtates alterius, atque etiam illius magnitu­
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              do. </s>
              <s id="s.000318">Nunc redeamus ad motus, nouamque adhuc methodum,
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              quam hoc loco reſeruauimus, afferamus.
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              <s id="s.000319">
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              DEF. IX.
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              <s id="s.000320">SIt quædam Geneſis ACBH, cuius imago temporis
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              & DCB &; item ſit FCBK geneſis alterius motus ab
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              eodem C in B; & actà rectà OIGE ipſi AFCD parallelą,
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              ponantur CD, GE loco minimorum temporum, ita vt
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                pore</expan>
              CD, dum mobile ex C affectum velocitate CA,
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              currat minimum ſpatiolum indicatum per C, cui eſt æqua­
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              le ſpatiolum aliud indicatum per G, quodque tranſigitur
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              tempore GE velocitate GD (nam vt eſſent illa ſpatia iņ
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              C, G æqualia, effectum fuit vt velocitas AC ad GD ean­
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              dem reciprocè rationem haberet, ac tempus GE ad CD,
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              id quod patet ex natura geneſis ACBH, & imaginis &
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              DCB &) et hic rurſus notatu digniſſimum eſt nulli errori
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              obnoxium eſſe, quòd æquabiles in illis minimis ſpatiolis
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              intellexerimus motus, quamuis potius deberet videri, in
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              ijſdem interuallis reperiri innumeras, ac inæquales veloci­
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              tates, queis nempe efficerentur motus inæquabiles, quòd
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              geneſes inæquabiles ſint. </s>
              <s id="s.000321">Cur iſta ſe ita habeant, hic non
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              eſt nobis diſputandum, ego enim puto, non ex indiuiſibili
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              velocitates alijs ſuccedere, ſed reuera minutulum tempo­
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              ris conſiderari debere antequam motus diuerſimodè pro­
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              cedat, nempe ac ſi velocitas, quæ ſuccedere debet priori,
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              non ita ſit in promptu, aut non ita ſtatim mobile afficiat ad </s>
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