Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              tur per horizontalem, quæ conueniat cum eadem linea directionis,
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              iactus eſt longior toto illo ſpatio, quod nauis decurrit, dum iactus
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              durat; </s>
              <s id="N10A6E">breuior tamen, ſi in partem oppoſitam fiat iactus in hoc ca­
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              ſu, ſi nauis æqualem impetum imprimeret, deorſum rectà ferretur
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              mobile motu naturali; </s>
              <s id="N10A76">imò ſagitta poſſet retorqueri in iaculatorem: </s>
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              ſi terra eſſet vtrimque peruia, lapis demiſſus per multa annorum
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              millia libraretur; non tamen eſſet motuus perpetuus. </s>
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            <figure id="id.026.01.020.1.jpg" xlink:href="026/01/020/1.jpg" number="10"/>
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              De motu reflexo.
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              <s id="N10A95">1. MOtus reflexi vera cauſa eſt impetus prior, ad nouam li­
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              neam determinatus ab occurrente obice; </s>
              <s id="N10A9B">planum refle­
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              ctens eſt cauſa nouæ determinationis ſuo modo; </s>
              <s id="N10AA1">cauſam enim di­
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              co eam, ex qua aliquid ſequitur: </s>
              <s id="N10AA7">ex gemina determinatione, noua,
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              ſcilicet, per ipſam perpendicularem erectam in puncto contactus,
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              & priore per lineam incidentiæ, ab eodem puncto contactus pro­
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              pagatam, fit determinatio mixta per lineam reflexionis; </s>
              <s id="N10AB1">quæ omnia
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              patent ex terminis: </s>
              <s id="N10AB7">hinc nullus impetus producitur à plano refle­
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              ctente; </s>
              <s id="N10ABD">quippe prior poteſt determinari ad nouam lineam: adde,
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              quòd planum, quod caret impetu, impetum producere non poteſt. </s>
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              <s id="N10AC5">2. Imò nihil impetus deſtruitur in reflexione pura per ſe; </s>
              <s id="N10AC9">quia ni­
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              hil impetus eſt fruſtrà per ſe in pura reflexione; </s>
              <s id="N10ACF">multus tamen im­
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              petus deſtruitur per accidens, tùm ab ipſo attritu tùm mollitie
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              & ceſſione, tùm preſſione: </s>
              <s id="N10AD7">hinc ſuppoſito eodem iactu, perpendi­
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              cularis reflexa eſt omnium reflexarum minima; </s>
              <s id="N10ADD">quia per eam li­
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              neam maximus ictus infligitur; </s>
              <s id="N10AE3">igitur maxima eſt partium colliſio,
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              & preſſio: hinc etiam corpora duriora longiùs reflectuntur, per ipſam
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              quoque
                <expan abbr="perpendicularẽ">perpendicularem</expan>
              , dum planum reflectens ſit æquè durum. </s>
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              <s id="N10AF1">3. Determinatio noua dupla eſt prioris, poſita linea incidentiæ
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              perpendiculari, & poſito etiam plano reflectente immobili; </s>
              <s id="N10AF7">quia
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              alioquin anguli reflexionis non eſſent æquales angulis incidentiæ: </s>
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              ſi globus reflectens ſit æqualis impacto, æqualis eſt ceſſio reſiſtenciæ
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              cùm ſit æquale agens reſiſtenti, perid enim reflectens reſiſtit, per
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              quod eſt: </s>
              <s id="N10B06">igitur, ſi æqualis reſiſtit, & cedit, certè æqualiter ce­
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              dit, & reſiſtit: </s>
              <s id="N10B0C">hinc noua determinatio æqualis eſt priori: </s>
              <s id="N10B10">hinc glo­
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              bus impactis ſiſtit immobilis; quia ex duabus determinationibus
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              oppoſitis neutra præualet. </s>
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