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

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              Ibidem.</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
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              PROP. CCIII.
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              Modò noua demonſtratione noſtra oſtendemus, quòd in duo­
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              bus medijs fluidis inæqualitèr denſis, & reſistentibus
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              velocitates eiuſdem corporis grauis poſſunt habere maio­
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              rem, eamdem, & minorem proportionem reciprocam,
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              quam habent crasſities eorumdem fluidorum, ſi tamen
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              graue in vtroque fluido deſcendat.
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            <p type="main">
              <s id="s.002158">IN vaſe CF ſit fluidum M, cuius
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              , craſſities,
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              vel reſiſtentia ad diſtractionem erit certæ, ac de­
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              terminatæ menſuræ, ſit illa S, atque in vaſe CG po­
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              natur aliud fluidum N, cuius craſſities, & reſiſtentia
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              R ſit maior, quàm S. præterea
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              idem mobile A, quod in vtro­
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              que fluido M, & N deſcende­
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              re valeat, eodem tempore T
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              percurrat ſpatium CD fluidi
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              M, ſpatium verò CE alterius
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              fluidi N. & quia vis motiuą
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              eiuſdem mobilis A vnica eſt,
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              & certi, ac determinati gra­
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              dus, propterea impetus, & ve­
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              locitas naturalis eiuſdem gra­
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              uis A ſemper eſt
                <expan abbr="eadẽ">eadem</expan>
              , & eiuſ­
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              dem gradus, ſi omninò remo­
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              ueri poſſent impedimenta, quæ à medij reſiſtentią
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              afferuntur,
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              nulla alia de cauſa alteretur, varietur­
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              que velocitas eiuſdem grauis A in diuerſis fluidis M, </s>
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