Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              alio; </s>
              <s id="N103A8">quanquam impetus tantùm deſtruitur, cùm eſt fruſtrà: </s>
              <s id="N103AC">hinc, ſi
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              eſſet tantùm vnicus in eodem mobili, & liberum eſſet medium,
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              nunquam deſtrueretur nec vnquam dici poſſet functus ſuo mune­
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              re; quod omninò gratis dicitur. </s>
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              <s id="N103B8">8. Hinc, ſi ſint tantùm duo impetus in eodem mobili æquales
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              verbi gratia, vel ad eandem lineam determinantur, vel ad diverſas; </s>
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              ſi ad eandem, nihil impetus deſtruitur, ſed eſt duplò velocior mo­
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              tus; </s>
              <s id="N103C5">ſi ad diuerſas, vel ſunt oppoſitæ ex diametro, vel concurrentes
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              faciunt angulum; </s>
              <s id="N103CB">ſi primum, vterque deſtruitur impetus; ſi ſe­
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              cundum, deſtruitur aliquid illius, quod determinabimus in­
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              frà. </s>
              <s id="N103D3">Impetus innatus nunquam deſtruitur: </s>
              <s id="N103D7">dici poſſet grauitas ab­
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              ſoluta; ſaltem nihil eſt, quod diſtingui ab illa probare poſſit. </s>
              <s id="N103DD">Porrò
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              nunquam deſtruitur; </s>
              <s id="N103E2">quia nunquam eſt fruſtrà; quippe eius finis,
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              vel vſus, non eſt tantùm motus deorſum, ſed grauitatio, ſeu niſus
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              quidam deorſum. </s>
              <s id="N103EA">Sed de grauitate aliàs. </s>
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              De motu naturali deorſum.
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              <s id="N10401">1. DAtur motus naturalis grauium deorſum ab intrinſeco,
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              quippe non poteſt eſſe, vel à vi tractrice terræ vel fila­
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              mentis quibuſdam, vel materia quadam tenui expultrice. </s>
              <s id="N10408">Eius finis
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              eſt globi terreſtris compactio, &c. </s>
              <s id="N1040D">Eſt autem motus naturalis ab
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              impetu: </s>
              <s id="N10413">primò, quia eius acceleratio ſine impetu explicari non po­
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              teſt: </s>
              <s id="N10419">ſecundò, quia, cùm graue deorſum cadens imprimat impetum
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              in corpore occurrente, certè debet habere impetum: nec alio ar­
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              gumento mihi probabis, Solem eſſe lucidum, ignem calidum. </s>
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              <s id="N10423">2. Motus hic eſt naturaliter acceleratus, ſcilicet, ab intrinſeco;
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              patet experientiâ. </s>
              <s id="N10429">Ratio eſt: </s>
              <s id="N1042C">quia, cùm in libero medio non impe­
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              diatur motus, & impetus productus primo inſtanti non conſerue­
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              tur ſecundo à cauſa primò productiua, ſed ab alia, ſitque ipſa mo­
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              bilis ſubſtantia cauſa neceſſaria; </s>
              <s id="N10436">certè ſecundo inſtanti producit
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              nouum impetum: idem dica de tertio, quarto, &c. </s>
              <s id="N1043C">igitur creſcit
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              cauſa motus; </s>
              <s id="N10442">igitur & motus: quæ ratio clariſſima eſt: </s>
              <s id="N10446">hinc æquali­
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              bus temporibus æqualia acquiruntur velocitatis momenta; </s>
              <s id="N1044C">quia
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              cauſa neceſſaria æqualibus temporibus, æqualem effectum produ­
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              cit: quid clarius? </s>
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              <s id="N10456">3. Hinc non poteſt creſcere hic impetus ſecundùm porportio-</s>
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