Ceva, Giovanni, Geometria motus, 1692

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              eodem tempore MV, eritque ob id in X velocitas, & dire­
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              ctio, tangens ipſa ZX æqualis VO, & in I velocitas, & di­
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              rectio, tangens 2 I æqualis VS; Itaque datis punctis X, I, A
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              dabitur etiam Y extremum ſemitæ compoſiti motus, cuius
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              latera AX, AI, & ideo mobile dum eſt in Y momento V
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              affectum erit duplici velocitate, hoc eſt Y 4 æquali ve­
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              locitati ZX, ſeu VO, ac æquidiſtante eidem ZX, et veloci­
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              tate altera Y 3 æquali, & æquèdirecta ipſi 2 I: quare ex
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              datis punctis 4, Y, 3 inuenietur punctum S quartus angu­
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              lus parallelogrammi habentis diametrum YI, quæ quidem
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              erit directio, & velocitas mobilis currentis compoſito mo­
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              tu inſtanti V. </s>
              <s id="s.000469">Cumque alia quotcunque puncta eadem
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              methodo reperire queamus, per quæ duci poſſit linea ferè
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              quæſitam ſemitam repræſentans,
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              emulans, patet idcir­
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              co, quod propoſuimus. </s>
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            <p type="margin">
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              Pr,
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              10.
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              huius.
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            <p type="margin">
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              Ex pr.
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              3.
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              hu.
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            <p type="margin">
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              Pr.
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              2.
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              primi
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              huius.
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            <p type="margin">
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              Cor.
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              2.
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              def.
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              3.
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              huius.
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            <p type="margin">
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                <emph type="italics"/>
              Pr.
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              3.
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              huius
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            <p type="main">
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              Corollarium.
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              Cum verò directiones ſint idem, ac tangentes, liquet HL
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              VS tangentes eſſe compoſiti motus.
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              Pr.
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              8
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              huius.
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              PROP. XII. THEOR. VIII.
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              <s id="s.000479">CVm imagines velocitatum, iuxta quas curruntur duę
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              rectæ, quæ ſint latera compoſiti motus, ſunt paral-
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              lelogrammum, & triangulum; tunc ſemita compoſiti motus
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              erit communis parabola. </s>
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              Tab.
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              5.
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              Fig.
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              1.</s>
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              <s id="s.000482">Tempore HM curratur latus AC iuxta imaginem velo­
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              citatum HILM rectangulum, & latus AB iuxta imaginem
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              triangulum HMN; erit CA ad AB, vt imago
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                mum</expan>
              HILM ad aliam imaginem triangulum NHM. </s>
              <s id="s.000483">Fiat
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                <expan abbr="parellogrãmum">parellogrammum</expan>
              ACDB erit in D extremum ſemitæ com­
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              poſiti motus, quæ ſi ponatur AFC; Dico eſſe parabolam.
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              </s>
              <s id="s.000484">Sumatur in ipſa linea quoduis punctum F, ab ipſo dedu-</s>
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