Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              lo CF, retineatur pondus B ne ſcilicet deorſum cadat; </s>
              <s id="N1CF83">tùm ſubtrahatur
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              pondus trianguli CAD; nunquid fortè altera manus ſuſtinebit tantùm
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              ſubduplum ponderis B? & altera ſubduplum? </s>
              <s id="N1CF8B">igitur vt habeatur quod
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              ſuſtinet ſuppoſita dextra v.g. debet ſubſtrahi, quod ſuſtinet ſiniſtra, ſed
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              quod ſuſtinet ſiniſtra, eſt vt ipſa potentia, id eſt vt CA ad CD; igitur
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              tota CD repræſentat totum pondus, ſegmentum CF partem ponderis
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              quæ competit potentiæ E, FD verò partem quæ ſuſtinetur à pla­
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              no CF. </s>
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            <p id="N1CF9C" type="main">
              <s id="N1CF9E">Hinc facilè poſſet determinari quota pars ponderis incubet plano,
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              ſit enim planum inclinatum AC, perpendiculum AB, accipiatur AB
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              æqualis AB, ſitque AC tripla AB, duæ tertiæ ponderis incubant plano
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              ſi verò ſit horizontale planum, totum pondus grauitat in illud; </s>
              <s id="N1CFA8">nulla eſt
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              enim perpendicularis, ſi ſit perpendiculare planum, nihil prorſus gra­
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              uitat; </s>
              <s id="N1CFB0">quia nulla eſt inclinata, & quò propiùs accedit planum inclina­
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              tum ad horizontalem plùs grauitat pondus in illud, minùs verò; quò
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              propiùs accedit ad perpendicularem. </s>
            </p>
            <p id="N1CFB8" type="main">
              <s id="N1CFBA">Hinc eſſet oppoſita ratio grauitationis, & motus, in plano inclinato; </s>
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              nam quò plùs eſt grauitationis minùs eſt motus, quò plùs motus, minùs
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              grauitationis; </s>
              <s id="N1CFC5">quando verò planum inclinatum eſt duplum perpendicu­
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              culi vt planum CFD, tunc
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              detrahitur de grauitatione in
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              planum quantùm de motu in eodem plano; </s>
              <s id="N1CFD1">ideſt vtrique ſubduplum,
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              ſi verò vt in plano ADC perpendiculum eſt ſubtriplum plani, detrahun­
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              tur de motu 2/3 & de grauitatione 1/3, idem dico de aliis, quæ certè omnia
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              ex veris principiis phyſicis conſequi videntur, quò enim plus grauitat
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              mobile in planum, plùs ſuſtinetur; </s>
              <s id="N1CFDD">quò plùs ſuſtinetur, plùs impeditur il­
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              lius motus; </s>
              <s id="N1CFE3">ſed hoc repugnat communi Mechanicorum ſententiæ, qui
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              cenſent grauitationem in planum inclinatum eſſe ad grauitationem in
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              horizontale, vt Tangens eſt ad ſecantem, quæ ſit linea plani inclinati,
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              v.g. vt AB ad CD, quod certè omnes ſupponunt, ſed minimè
                <expan abbr="demon-ſtrãt">demon­
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                ſtrant</expan>
              , ſi quid video ſaltem phyſicè; </s>
              <s id="N1CFF5">nec enim illud nemonſtrant propriè ex
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              eo quòd pondus in extremitate libræ affixum habeat diuerſa momenta
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              iuxta rationem Tangentium ad ſecantes, v.g. in ſecunda figura Th.5.
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              pondus in D eſt ad pondus in C vt BA ad DA, quod veriſſimum eſt, &
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              ſuprà demonſtrauimus; </s>
              <s id="N1D003">quippe hoc pertinet ad rationem momenti, non
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              verò grauitationis in planum; </s>
              <s id="N1D009">adde quod affixum eſt pondus vecti; </s>
              <s id="N1D00D">igi­
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              tur vectis ſuſtinet totum illius pondus; </s>
              <s id="N1D013">vtrùm verò ſi pondus in plano
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              inclinato veluti in vecte moueatur pondus quo grauitat in planum ſit
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              ad pondus quo grauitat in horizontali vt Tangens ad ſecantem, certè
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              non demonſtrant; </s>
              <s id="N1D01D">attamen ita res prorſus ſe habet; quare fit. </s>
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              <s id="N1D023">
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              Theorema
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              16.
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              Grauitatio ponderis in planum inclinatum eſt ad grauitationem eiuſdem
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              in planum horizontale, vt Tangens, vel horizontalis ad ſecantem, vel incli­
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              natam,
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              quod demonſtro. </s>
              <s id="N1D03D">Primò ſit planum inclinatum GD, pondus in-</s>
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