Fabri, Honoré, Tractatus physicus de motu locali, 1646

Table of figures

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              tiò, aliquando primæ tantùm ſuperficies extenduntur, vt videmus in
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              capite, ſeu baſi cuneorum; quia materies durior multùm reſiſtit. </s>
              <s id="N28D4B">Quartò,
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              limbus baſis dilatatæ contrahitur deinde, ſeu retorquetur deorſum; </s>
              <s id="N28D51">quia
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              cùm interiores circuli dilatentur, deberet facere limbus ille maiorem
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              circulum; quod cùm fieri non poſſit, contrahitur ſeu incuruatur deor­
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              ſum, quod facilè ſine figura intelligi poteſt. </s>
              <s id="N28D5B">Quintò, poteſt deter­
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              minari proportio ictuum, quibus deprimuntur cylindri; </s>
              <s id="N28D61">ſi enim ſup­
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              ponatur eadem altitudo, ſeu linea depreſſionis, & diuerſa craſſi­
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              tudo cylindrorum ictus, erunt vt baſes; </s>
              <s id="N28D69">nam quò plures partes de­
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              primendæ ſunt, maiore ictu opus eſt, ſi opponatur eadem craſſitudo
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              vtriuſque cylindri ſed diuerſa depreſſionis linea vel altitudo, ictus
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              erunt vt altitudines; </s>
              <s id="N28D73">ſi vtraque ſupponitur diuerſa, ictus erunt in ra­
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              tione compoſita ex ratione baſium, & altitudinum; quæ omnia conſtant
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              ex dictis. </s>
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              <s id="N28D7D">Obſeruabis tamen creſcere reſiſtentiam ex duplici capite. </s>
              <s id="N28D80">Primò,
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              ex eo quod aliquæ vacuitates occupentur à partibus depreſſis, ac proin­
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              de cylindrus induretur; ſic intus durior euadit ſub malleo, & & pila
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              lignea ſub ictibus. </s>
              <s id="N28D8A">Secundò, latiorem illam ſuperficiem impedire di­
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              latationem aliarum partium: </s>
              <s id="N28D90">hinc variè diſcerpitur eius limbus, vt
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              videre eſt in cuneo ferreo: </s>
              <s id="N28D96">atqui in explicandis ſuprà ictuum propor­
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              tionibus, hoc geminum reſiſtentiæ caput nullo modo conſiderauimus: </s>
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              ſextò, quærunt aliqui dato ictu, quo deprimitur cylindrus data alti­
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              tudine, quantum pondus eſſe debeat, quod ſua grauitatione eum­
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              dem præſtet effectum; ſed profectò id nemo vnquam determinauit,
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              niſi primò inueniat pondus, cuius caſu prædictus cylindrus eodem
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              modo deprimatur. </s>
              <s id="N28DA9">Secundò, niſi ſciat quot inſtantibus deſcendat, vt
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              patet ex his quæ diximus ſuprà; vt autem comparetur ictus inflictus
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              à brachio cum ictu inflicto à pondere cadente, debet conſuli diuerſa
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              depreſſio, vel defixio. </s>
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              <s id="N28DB5">Vigeſimoqnartò, corpus cadens in planum horizontale per lineam
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              perpendicularem, maximum ictum infligit: </s>
              <s id="N28DBB">maiorem, cum cadit in pla­
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              num decliue, quod manifeſtum eſt; </s>
              <s id="N28DC1">poteſt autem determinari propor­
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              tio ictuum ratione planorum; </s>
              <s id="N28DC7">ſit enim perpendicularis KN cadens in
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              planum horizontale AD, erit maximus ictus; </s>
              <s id="N28DCD">ſit vt AD; </s>
              <s id="N28DD1">fiat quadrans
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              ADG: </s>
              <s id="N28DD7">ſit planum decliue AE, in quod cadit KM; </s>
              <s id="N28DDB">ducatur EC vel
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              EI; </s>
              <s id="N28DE1">primus ictus eſt ad ſecundum, vt AD ad AC vel IE; </s>
              <s id="N28DE5">ſit aliud
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              planum decliue AF, in quod cadit KN; </s>
              <s id="N28DEB">ducantur FBFH, primus eſt
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              ad tertium, vt AD ad AB; patet ex dictis ſuprà, cum de planis in­
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              clinatis. </s>
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              <s id="N28DF5">Vigeſimoquintò, ſi verò cadat corpus graue in globum, aſſumenda eſt
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              Tangens puncti contactus v. g. ſit globus centro A ſit corpus cadens
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              per FD; </s>
              <s id="N28E01">ſit punctum contactus D; </s>
              <s id="N28E05">ſit Tangens CE; </s>
              <s id="N28E09">idem eſt ictus,
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              qui eſſet, ſi corpus graue caderet in planum inclinatum CE; </s>
              <s id="N28E0F">ſi verò
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              globus cadat in aliud corpus v. g. globus A in corpus HG
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              per lineam RG; </s>
              <s id="N28E1B">ducatur AG, tùm GS, ictus in G eſt ad ictum </s>
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