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

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              <s id="id.000535">
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              proinde vnquam deſineret. </s>
              <s id="id.000536">Et vis aliquod (quale
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              certè haberi poteſt) experimentum? </s>
              <s id="id.000537">Appende ſilo
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              plumbum, lapidemve, qui in perpendiculo con­
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              quieſcat, ac poſteà illum prorſùm impelle; concipies
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              hunc motum, ex ſe, æquabilem, perpetuumque eſſe.
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              </s>
              <s id="id.000538">Cùm tantulam enim impreſſeris vim, vnde ſit, vt
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              lapis toties excurrat, recurratque, ac excurrendo,
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              recurrendóque tantum inſumat temporis? </s>
              <s id="id.000539">Non exi­
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              ſtimaſſes profectò motum tanti corporis ex tantula
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              vi tandiù duraturum. </s>
              <s id="id.000540">Sed nempe lapidis attractio,
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              quæ à Terra fit, à fi o cohibetur, ſicque lapis inter
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              duas oppoſitas vireis veluti indifferens manet; vnde
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              ſi illum tranſuerſùm pellas, motum imprimas, ad
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              quem non habeat reſiſtentiam; ſicque, niſi aliud in­
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              terueniat, tueri illum conſtanter poſſit. </s>
              <s id="id.000541">Neque ob­
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              ſtat, quòd motus omninô tranſuerſus, ſiue ſecun­
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              dum horizontem non ſit, ſed fiat obliquè, ac ſur­
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              ſum; nam quia licet filum retineat, tum tamen etiam
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              Terra retrahit; vt & quando Terra deorſùm redu­
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              cit, tunc quoque filum retinet; heinc eſt, cur facta
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              iſtarum vnium oppoſitarum compenſatione, non ex
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              hoc capite tollatur impreſſi motus conſtantia. </s>
              <s id="id.000542">Et
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              quamuis tolli videatur æqu bilitas, quatenùs lapis in
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              tranſcurſu per infimum punctum, ſiue perpendicu­
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              lum, celerrimè mouetur, tardiſſimè verò in aſcen­
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              ſus fine, & exſcenſus initio; ac proportione in cæteris
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              locis; nihilominùs eaſemper æquabilitas perſeuerat,
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              vt omnium excurſuum, recurſuumque durationes
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              æquales ſint; hoc eſt, ſub initium ſint quidem ma
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              jores, ſub finem minores: ſed non proptereà vn-</s>
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          </chap>
        </body>
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