Ceva, Giovanni, Geometria motus, 1692

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              cta FE parallela AB, vti etiam FG parallela AC, erunt
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              AE, AG latera compoſiti motus, cuius ſemita AF: Con­
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              cipiatur modò P momentum, quo mobile adeſt in F, &
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              ducta OPK parallela alteri HI, vel NL, erit imago MHIL ad
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                <expan abbr="imaginẽ">imaginem</expan>
              PHIK, hoc eſt MH ad HP, vt CA ad AE, ſeu vt BD
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              ad GF. </s>
              <s id="s.000485">Pariter erit imago NHM ad
                <expan abbr="imaginẽ">imaginem</expan>
              OHP, hoc eſt
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              quadratum ex MH ad
                <expan abbr="quadratũ">quadratum</expan>
              ex PH; immò id ex BO ad
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              illud ex GF, vt BA ad AG; quamobrem punctum F cadet
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              in curuam parabolicam communem, cuius diameter AB,
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              & baſis, ſeu ordinatim applicata BD, ſcilicet AFD erit ipſa
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              curua parabolica. </s>
              <s id="s.000486">Quod &c. </s>
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            <p type="margin">
              <s id="s.000487">
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              pr.
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              2.
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              primum
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              huius.
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            <p type="margin">
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              Pr.
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              3.
                <emph type="italics"/>
              huius.
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              </s>
            </p>
            <p type="margin">
              <s id="s.000489">
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              Ex eadem.
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            <p type="margin">
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                <emph type="italics"/>
              Pr.
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              2.
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              huius.
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            <p type="main">
              <s id="s.000491">
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              Scholium.
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                <emph.end type="center"/>
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              <s id="s.000492">
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              Quoniam graue, quod iaculatur extræ perpendiculum, li­
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              berum ab omni obice, niſi turbaretur eius motus à proprią
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              grauitate pergerct moueri æquabiliter iuxta directionem, ve­
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              locitatemque ei traditam; habet verò coniunctam grauita­
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              tem, qua, niſi ab impreſſo impetu flecteretur motus, deſcen­
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              deret iuxta perpendiculum motu naturaliter concitato, cuius
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              imago velocitatum, triangulum eſt; Hinc propterea granę
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              vltra perpendiculum proiectum deſcribit in curſu ſuo, motu
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              ſcilicet compoſite, parabolam vulgatam. </s>
              <s id="s.000493">Verùm enim verò
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              deſcriptionem iſt am neceſſe aliquo pacto eſt ex duabus cauſis
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              vitiari, hoc est ab aeris reſiſtentia, & perpendiculis non in­
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              terſe parallelis, quippe in idem,
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              punctum, vniuerſi
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              centrum, conuergentibus.
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            <p type="main">
              <s id="s.000494">
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              PROP. XIII. THEOR. IX.
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              </s>
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            <p type="main">
              <s id="s.000495">SI ab aſſumpto hyperbolæ puncto, recta axi primo pa­
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              rallela deducatur, quæ ad ſecundam diametrum per­
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              tingat; Quadrilineum comprehenſum ab ipſa curua hy­
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              perbolica. </s>
              <s id="s.000496">& dictis tribus rectis, erit imago velocitatis il-</s>
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