Fabri, Honoré, Tractatus physicus de motu locali, 1646

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          <section>
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              ta applicatio, cum maximo impedimento, quod reuerâ tunc eſt,
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              cùm linea directionis connectit centra grauitatis vtriuſque. </s>
              <s id="N102F4">Datur
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              impetus alio impetu perfectior, & imperfectior, ſine quo non po­
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              teſt explicari natura vectis: </s>
              <s id="N102FC">itaque dato quocunque dari poteſt per­
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              fectior, & imperfectior: quia dato quocunque motu poteſt dari ve­
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              locior, & tardior. </s>
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              <s id="N10306">4. Propagatur impetus vniformiter tantùm, cùm omnes partes
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              corporis mouentur motu recto æquali: </s>
              <s id="N1030C">ibi enim eſt æqualis cauſa,
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              vbi eſt æqualis effectus: </s>
              <s id="N10312">in motu circulari applicata potentia cen­
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              tro vectis, producitur æqualis perfectionis versùs circunferentiam,
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              & inæqualis numerus; </s>
              <s id="N1031A">applicata verò potentia circunferentiæ, pro­
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              ducitur æqualis numerus, ſed inæqualis perfectionis versùs cen­
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              trum; </s>
              <s id="N10322">quia potentia non poteſt producere immediatè perfectiorem,
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              & imperfectiorem in infinitum: </s>
              <s id="N10328">eadem potentia neceſſaria æquali­
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              bus temporibus, & iiſdem circunſtantiis, producit æqualem impe­
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              tum, & inæqualibus inæqualem: eſt enim hæc ratio cauſæ neceſ­
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              ſariæ. </s>
            </p>
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              <s id="N10334">5. Impetus innatus eſt tantùm determinatus ad lineam perpen­
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              dicularem deorſum; </s>
              <s id="N1033A">alioquin ſi ad aliam determinari poſſet, primo
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              eſſet æqualis motus per inclinatam, & perpendicularem; </s>
              <s id="N10340">corpus
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              graue miſſum per lineam inclinatam ab eo non declinaret; </s>
              <s id="N10346">imò im­
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              petus ſemel productus (ſi liberum eſſet medium) non deſtrueretur: </s>
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              quæ omnia phyſicis hypotheſibus repugnant: omnis alius impetus,
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              etiam acquiſitus motu naturali deorſum, eſt indifferens ad omnem
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              lineam, ad vitanda infinita ferè naturæ incommoda. </s>
            </p>
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              <s id="N10357">6. Impetus indifferens determinatur ad lineam multis modis:
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              primò, à potentia motrice: </s>
              <s id="N1035D">ſecundò, ab impetu: </s>
              <s id="N10361">tertiò, ab alio impe­
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              tu concurrente; quartò, ab obice occurrente: </s>
              <s id="N10367">quintò, ab ipſo appli­
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              cationis diuerſo modo: quæ omnia clara ſunt: hinc duo impetus ad
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              motum mixtum ſæpè concurrunt, quod ſemper fit, niſi determina­
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              tiones ſint oppoſitæ ex diametro. </s>
              <s id="N10371">Impetus eſt capax intenſionis; </s>
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              quia aliquando deſtruitur ex parte: </s>
              <s id="N1037A">eius extenſio commenſuratur
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              extenſioni mobilis; </s>
              <s id="N10380">quod etiam cæteris qualitatibus commune eſt:
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              impetus productus non conſeruatur à cauſa primò productiua, à
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              qua etiam ſeparatus exiſtit. </s>
            </p>
            <p id="N10388" type="main">
              <s id="N1038A">7. Impetus non eſt contrarius alteri ratione entitatis; </s>
              <s id="N1038E">quia qui­
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              libet cum quolibet in eodem ſubiecto coëxiſtere poteſt: </s>
              <s id="N10394">pugnat
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              tamen vnus cum alio ratione determinationis: </s>
              <s id="N1039A">hinc vnus impetus
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              pugnat cum alio ratione lineæ motus: </s>
              <s id="N103A0">hinc vnus videtur deſtrui ab </s>
            </p>
          </section>
        </front>
      </text>
    </archimedes>
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