Gassendi, Pierre, De motu impresso a motore translato epistulae duae, 1642
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              luti virga, aut lamina, vbi manu deflexa eſt, dimittente mæ­
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              na moueatur, ſuumque ſitum repetat?
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              ne moroſus videar,
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              pauca hæc ſubiicio. </s>
              <s id="id.001000">Habe primùm in æquilibrio ſu­
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              pra digitum læuæ manus bacillum aliquem tranſuer­
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              ſum: adige deorsùm ictu dextræ manus eius extre­
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              mum, quod ad dextram; videbis extremum ſiniſtrum
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              ſursùm adigi, ob reſiſtentiam digiti, & continuïta­
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              tem, compactionemque bacilli. </s>
              <s id="id.001001">Occurrat extremo
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              ſiniſtro fixum aliquid (vt ſi digitus fuerit ad ſuperex­
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              ſtans quidpiam admotus) tum id extremum reflecte­
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              tur deorſùm, & aliud, quod tu percuſſeris, ſurſùm.
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              <s id="id.001002">Cùm duplex ibi motus ſit, vnus directus deorſùm ad
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              dextram, ſursùm ad læuam; & alius reflexus deorsùm
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              ad læuam, ſursùm ad dextram: quænam vtriuſque
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              cauſa eſt? </s>
              <s id="id.001003">Nempe vnicus manus tuæ ictus; vt vnicus
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              ictus reticuli eſt, quo adacta pila in parietem tendit, &
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              à pariete reſilit. </s>
              <s id="id.001004">Contine deinde bacillum, vnumve il­
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              lius extremum, putà inferius, ſiniſtro pugno: tum, ſi
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              manu dextra impreſſeris ictum ſuperiori verſus ſini­
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              ſtræ pollicem, perſenties inferius impingi in oppoſi­
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              tam inferiorem ſiniſtræ, partem, ac ſimul perſenties
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              reflexionem fieri tum inferioris extremi in apicem
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              auricularis, tum ſuperioris in radicem indicis. </s>
              <s id="id.001005">Quid
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              reflexionem hanc faciet? </s>
              <s id="id.001006">An-non impreſſus à dextra
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              ictus, & reſiſtentia cùm pollicis, tum inferioris manus
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              partis? </s>
              <s id="id.001007">Agnoſces ex his, procul dubio, quid ad quæ­
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              ſtionem dicturus ſim. </s>
              <s id="id.001008">Scilicet deflexo altero extre­
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              mo rei flexilis, debet alterum ob parem rationem
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              contineri firmum, debentque eſſe in continente par­
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              tes duæ oppoſitæ, vna exſtantior, quæ reſiſtat, alia </s>
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