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

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              tinüare, & perinde perficere, ac ſi immoto corpore
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              ſtante, mota manus ſola motum impreſſiſſet? </s>
              <s id="id.000199">En
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              verò, quod magis mirere. </s>
              <s id="id.000200">Conſiſte primùm in per­
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              gulæ medio, & nunc antrorsùm, nunc retrorsum,
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              moderata vi pilam conijce: adeò vt ad certum vſ­
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              que ſpatium, quod notari poſſit, vtrímque excurrat.
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              </s>
              <s id="id.000201">Incede deinde, & ab vna parte ad idem medium
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              perueniens (nec moueri proptereà codem tenore de­
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              ſinens) pari vi pilam conijce. </s>
              <s id="id.000202">Videbis profectò pro­
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              jectam antrorsùm excurrere longiùs, quam excur­
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              rerit anteà; projectam verò retrorsùm, vel excur­
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              rere breuiùs, vel conſiſtere, vel etiam te ſequi. </s>
              <s id="id.000203">Cau­
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              ſa nempe eſt, Quia cùm antrorsùm conijcis, dupli­
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              cem illi imprimis vim; altera quippe eſt manus pro­
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              pria, & qualis anteà erat, cùm ſtares corpore immo­
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              to; altera corporis ipſius, quâ eidem manui com­
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              municatâ, efficitur, vt manus feratur antrorsùm ce­
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              leriùs; quàm ipſa ſola, & reliquo corpore quieſcente,
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              moueretur. </s>
              <s id="id.000204">Ex quo fit, vt pila accepto velociore
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              motu, moueatur velociùs, & procurrat vlteriùs. </s>
              <s id="id.000205">Cùm
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              proijcis verò retrorsùm, vides à manu non alium
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              motum, quàm ipſius proprium verſus eam partem
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              imprimi; nam qui motus eſt à reliquo corpore, in­
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              oppoſitam tendit partem. </s>
              <s id="id.000206">Conſideranda eſt ergo
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              manus cùm duplici motu, vno ſibi proprio retror­
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              sùm, altero ex corporis tranſlatione antrorsùm. </s>
              <s id="id.000207">Ex
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              hoc enim fit, primò, vt pila nunquam poſſit tantun­
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              dem retrorsùm excurrere, ac excurrerat anteà; quo­
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              niam licet manus motu proprio moueatur æqualiter;
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              non tantundem tamen promouetur retrorsùm, quòd </s>
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