Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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              <s id="s.002158">
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              N, nifi quia prædicta fluida diuerſimodè reſiſtunt, &
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              alterant naturalem impetum, & motum eiuſdem mo­
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              bilis. </s>
              <s id="s.002159">Supponamus igitur, quod gradus abſolutus ve­
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              locitatis grauis A non retardatus, neque impeditus
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              à craſſitie alicuius medij fluidi ſit
                <expan abbr="tãtæ">tantæ</expan>
              energiæ vt
                <expan abbr="tẽ-pore">ten­
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                pore</expan>
              T excurrere poſſit prolixiùs ſpatium CL; quare
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              retardatio profecta à craſſitie fluidi M impedientę
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              eius motum ſit DL, ſed à maiori craſſitie R alterius
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              fluidi N retardetur ſubtrahaturque ab integro, & na­
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              turali eius fluxu ſpatium EL maius quam DL. modò
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              ſi retardatio DL facta à denſitate S fluidi M mi­
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              nor fuerit ſpatio CE exacto in fluido N minori ve­
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              locitate; dico, quod corporis A maior velocitas in
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              fluido M ad minorem velocitatem, quam exercet in
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              fluido N minorem proportionem habebit, quàm
                <expan abbr="re-ſiſtẽtia">re­
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                ſiſtentia</expan>
              , ſeù craſſities R ad reſiſtentiam S: ſi verò DL
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              æqualis fuerit CE proportionalia erunt; & tandem̨
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              ſi DL maior fuerit, quam CE, tunc velocitas, quam̨
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              exercet A in M ad velocitatem, quam exercet in N
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                <expan abbr="maiorẽ">maiorem</expan>
                <expan abbr="proportionẽ">proportionem</expan>
              habebit, quàm craſſities R ad S. </s>
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              Cap. 10. de
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              æquitempo­
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              ranea natu­
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              rali veloci­
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              tate
                <expan abbr="grauiũ">grauium</expan>
              .</s>
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            <p type="main">
              <s id="s.002161">Ponamus primò DL minorem eſſe, quàm CE. quia
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              eadem ED ad maiorem CE habet
                <expan abbr="minorẽ">minorem</expan>
              propor­
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              tionem quàm ad minorem DL, igitur componendo
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              DC ad CE minorem proportionem habebit, quàm̨
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              EL ad LD, ſed vt DC ad CE, ita ſe habet velocitas
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              ipſius A in fluido M ad
                <expan abbr="velocitatẽ">velocitatem</expan>
              eiuſdem in fluido
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              N, (propterea quòd velocitates eodem tempore T
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              exactè proportionales ſunt ſpatijs excurſis): & ſimi­
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              litèr impedimentum, & retardatio, quam affert craſ-</s>
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