Gassendi, Pierre, De motu impresso a motore translato epistulae duae, 1642

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            <p type="main">
              <s id="id.000566">
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              motum fieri velociorem; impelle tertio, adhûc ve­
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              lociorem; impelle quarto, adhûc magis; atque ita
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              porrô; adeò vt clarum eſſe videatur, velocitatem
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              motus non aliunde increſcere, quàm ex eo, quòd mo­
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              bile dum in motu eſt, de nouo mouetur, ſeu nouum
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              impulſum accipit à cauſa externa. </s>
              <s id="id.000567">Neque verò, cùm
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              impulſum dico, attractum non intelligo: quippe
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              cùm attrahere nihil aliud ſit, quàm recuruato inſtru­
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              mento verſum ſe impellere; & perſpicuum ſit lapi­
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              dem, globumve memoratum tam impelli vno, plu­
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              ribuſve ictibus poſſe, ſi quis ipſum antecedendo cur­
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              uis digitis adigat, quàm ſi ſubſequendo deuexis
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              propellat. </s>
              <s id="id.000568">Tertiò, cùm de motus deorſùm accele­
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              ratione agatur, conſtat iam, ſiue aër ſolus ſupernè
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              impellat, ſiue Terra ſola infernè accerſat, ſiue aër,
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              & Terra ſimùl vireis conferant, non eſſe ſatis, vt la­
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              pidi vnicus initio ictus imprimatur; ſed eſſe neceſſa­
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              rium, vt noui, nouique imprimantur continuò; alio­
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              quin enim lapis non acceleraret gradum, ſed ferre­
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              tur motu vt æquabili, ita imperceptibili; ſegniſſimo
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              videlicet, propter tenuïtatem ſimplicis conatus,
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              ſeu vnici ictus penè nullam vim. </s>
              <s id="id.000569">Cùm verò ſeu ſola
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              impulſio, ſeu ſola attractio ad accelerationem ſuffi­
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              ciat; quid-nam cauſæ eſſe putabis, cur cenſeam
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              vtramque eſſe coniungendam? </s>
              <s id="id.000570">Nempe in cauſa pro­
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              portio eſt, qua dictum eſt antè accelerationem fieri,
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              Nam fac vnicam eſſe cauſam, exempli gratiâ attra­
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              ctionem; concipies quidem ex dictis ſequi, vt quia
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              radij magnetici, quaſi ſtringentes chordulæ, con­
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              tinentem motum, ſiue impetum lapidi imprimunt, </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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