Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              fligit, non quidem in centro grauitatis, id eſt, in medio, ſi ſit cy­
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              lindrus, vel parallelipedum; </s>
              <s id="N112DB">nec in extremitate mobili; </s>
              <s id="N112DF">ſed in eo
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              puncto, in quo eſt centrum impetus impreſſi, id eſt, quod æqualem
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              vtrinque dirimit impetum: ratio eſt; </s>
              <s id="N112E7">quia tunc totus impetus agit,
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              quantùm poteſt; </s>
              <s id="N112ED">illud autem punctum Geometria demonſtrat eſſe
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              terminum mediæ proportionalis, inter totum cylindrum, & ſub­
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              duplum; modò nulla ratio vectis habeatur alioquin centrum pro­
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              cuſſionis diſtat 2/3 ab extremitate immobili. </s>
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              <s id="N112F9">10. Cùm fuſtis inflectitur, reditque ad priſtinum ſtatum, vt
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              videre eſt in tudicula maiore, maior ictus imprimitur: </s>
              <s id="N112FF">quia non
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              tantùm agit impetus extrinſecùs adueniens; </s>
              <s id="N11305">verùm etiam potentia
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              quædam media, quæ corpora compreſſa, vel tenſa, ad priſtinum
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              ſtatum reducit: hinc maximus eſt ictus tudiculæ, cùm eo inſtanti,
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              quo reductum eſt omninò manubrium priori rectitudini, infligitur
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              ictus, quia tunc vis potentiæ mediæ eſt maxima. </s>
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              <s id="N11313">11. Rotato flagello ideò maxima vis ineſt, quia diutiùs potentia
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              manet applicata: </s>
              <s id="N11319">hinc vides hoc principium eſſe vniuerſaliſſimum,
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              quod iactis, pulſis, & impactis competit; </s>
              <s id="N1131F">de malleorum ictu idem
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              prorſus dicendum eſt, quod de fuſte; </s>
              <s id="N11325">ſi autem mallei cadant
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              ex eadem altitudine, motu naturali accelerato, ictus ſunt vt
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              mallei, quia duplus malleus, v. g. duplum impetum acquirit: nam
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              ſingulæ partes ſeorſim æqualem impetum acquirunt. </s>
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              <s id="N11335">12. Si verò ex diuerſa altitudine cadant, vel ſunt æquales, vel
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              inæquales: </s>
              <s id="N1133B">ſi primum, ictus ſunt vt tempora, quibus cadunt: </s>
              <s id="N1133F">ſi
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              ſecundum, ictus ſunt in ratione compoſita temporum, & mal­
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              leorum: </s>
              <s id="N11347">ſi ſunt infinitæ, partes actu, nulla eſt proportio percuſſionis
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              granuli cadentis, & rupis ingentis grauitantis; </s>
              <s id="N1134D">ſed hoc vltimum fal­
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              ſum eſſe conſtat; </s>
              <s id="N11353">non poteſt tamen determinari proportio vitium
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              grauitationis, & percuſſionis, niſi numerus inſtantium: quibus durat
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              motus deorſum cognoſcatur. </s>
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              <s id="N1135D">13. Leuiſſimi lapides vix emittuntur ad modicam diſtantiam; </s>
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              quia ſtatim ſeparantur à potentia: </s>
              <s id="N11366">parallelipedum cadens de or­
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              ſum in ſitu horizontali maximum ictum infligit in centro grauita­
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              tis, id eſt, in medio; </s>
              <s id="N1136E">quia tunc totus impetus agit, totus enim impe­
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              ditur: </s>
              <s id="N11374">in aliis punctis minor eſt ictus, iuxta proportionem maioris
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              diſtantiæ à prædicto centro: ſi verò percutiatur cylindrus innatans,
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              maxima erit vis, vel effectus ictus in centro grauitatis propter ean­
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              dem rationem. </s>
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          <chap id="N1137F"> </chap>
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