Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              tur æquilibrium, quo ſublato ſua ſponte mouetur rota; </s>
              <s id="N21EDE">hic autem impe­
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              tus primò durat in toto deſcenſu quadrantis AD; </s>
              <s id="N21EE4">immò acceleratur tan­
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              tillùm motus, licèt longè minùs, quàm in funependulo propter reſiſten­
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              tiam ſemicirculi oppoſiti contranitentis; </s>
              <s id="N21EEC">vbi verò A peruenit in D,
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              non acceleratur ampliùs motus, ſed tantillùm aſcendit verſus C &, dein­
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              de deſcendit, tandemque quieſcit in D paucis confectis vibrationibus; </s>
              <s id="N21EF4">
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              ſed de hoc curſu, & recurſu agemus fusè lib. ſequenti; </s>
              <s id="N21EF9">alter impetus eſt
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              productus ab extrinſeco, applicata ſcilicet valida potentiá, qui rotam
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              agit velociore motu, vt patet, cùm præter impetum ad intra ſit etiam im­
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              petus productus ab extrinſeca cauſa; </s>
              <s id="N21F03">igitur maior eſt impetus; igitur
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              maior motus: </s>
              <s id="N21F09">porrò hic impetus aliquandiu conſeruatur, vt patet expe­
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              rientiâ; nec eſt vlla cauſa ſufficiens applicata, à qua tam citò de­
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              ſtruatur. </s>
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            <p id="N21F11" type="main">
              <s id="N21F13">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              33.
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              </s>
            </p>
            <p id="N21F1F" type="main">
              <s id="N21F21">
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              Quando voluitur rota ab applicata valida potentia in A. v.g. per AO,
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              non modo producitur impetus in ſemicirculo BA DE, ſed etiam in oppoſito
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              ;
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              cùm vtrique mediatè vel immediatè ſit applicata ſufficienter, exemplo
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              vectis. </s>
            </p>
            <p id="N21F32" type="main">
              <s id="N21F34">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              34.
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              </s>
            </p>
            <p id="N21F40" type="main">
              <s id="N21F42">
                <emph type="italics"/>
              Non destruitur per ſe impetus productus in rota ab extrinſeco.
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              </s>
              <s id="N21F49"> Probatur,
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              quia licèt ſingulis inſtantibus mutetur eius determinatio, vt conſtat ex
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              dictis; </s>
              <s id="N21F51">nam per ſe impetus in hoc motu eſt determinatus ad lineam re­
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              ctam; </s>
              <s id="N21F57">nullus tamen impetus eſt fruſtrà: </s>
              <s id="N21F5B">quippè illud ſpatium acquiritur
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              in linea curua, quod in recta percurreretur ſi nullum eſſet impedimen­
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              tum; </s>
              <s id="N21F63">quemadmodum enim in reflexione, quæ fit à plano immobili, nul­
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              lus deſtruitur impetus; </s>
              <s id="N21F69">ita nullus hîc deſtruitur; tàm enim centrum il­
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              lud immobile ad ſe quaſi mobile trahit, quàm planum immobile ad ſe re­
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              pellit. </s>
            </p>
            <p id="N21F71" type="main">
              <s id="N21F73">Quæreret fortè aliquis, vtrum in ſemicirculo aſcendente impetus de­
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              ſtruatur ab impetu naturali grauitationis. </s>
              <s id="N21F78">Reſpondeo negando, quia
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              nunquam aſcendit C, niſi deſcendat A; </s>
              <s id="N21F7E">nunquam verò deſcendit A, niſi
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              ſit maior vis in A quam in C, quod certum eſt; </s>
              <s id="N21F84">igitur grauitatio C impe­
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              dit quidem, ne ſit tantus motus in A, nunquam tamen impedit totum
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              motum, cum maius eſt momentum in A; </s>
              <s id="N21F8C">quod ſi æquale ſit vtrinque mo­
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              mentum; certè totus motus vtrinque impeditur, & hæc eſt vera ratio
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              æquilibrij, de quo aliàs. </s>
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            <p id="N21F94" type="main">
              <s id="N21F96">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              35.
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              </s>
            </p>
            <p id="N21FA2" type="main">
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              Hinc ſi nullus ſit partium affrictus, eſſet motus ille perpetuus
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              ; quia nul­
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              lus deſtruitur impetus per Th. 34. igitur ille motus eſſet perpetuus. </s>
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            <p id="N21FAF" type="main">
              <s id="N21FB1">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
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              36.
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              </s>
            </p>
            <p id="N21FBD" type="main">
              <s id="N21FBF">
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              In maiore rota eſt maior affrictus partium, & impetus citiùs destruitur.
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              Secunda pars ſequitur ex prima; hæc autem ex maiore ponderis grauita­
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              tione, vel in axem, vel in ſubjectum planum. </s>
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