Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

Table of figures

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              <s id="N1566F">Nec obſtat, quod Baldus adducit ad probandum ictum
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              ex enſe, efficaciorem eſſe à parte, quæ eſt circa medium, ex
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              eo quod ibi conſtituatur centrum grauitatis, ac propterea
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              cuſpis non niſi dimidium ponderis habeat reſpectu illius.
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              <s id="N15679">Nam licet pondus cuiuſlibet inſtrumenti multum conducat
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              ad validiorem percuſsionem, vt patet in malleo, & in claua,
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              cuius caput propterea efficitur maius: Nihilominus præ­
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              ſertim in enſe runca, & alijs procerioribus inſtrumentis, non
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              tam attenditur pondus ipſius partis ferientis, quàm diſtan­
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              tia à centro ſui motus, ex qua prouenit maior velocitas, &
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              efficacitas ictus ipſius. </s>
              <s id="N15688">Et planè ſi quæramus centrum gra­
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              uitatis in enſe, nec circa medium enſis illud reperire fas erit,
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              ſed potius prope capulum, vel manubrium, vt obſeruanti
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              patebit, ex qua parte euidentiſsimum eſt, non procedere
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              ictum validiorem. </s>
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              <s id="N15695">Quod ſi enſis ictus facilius euitetur, aut euadatur cum
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              quis enſi obuiet verſus cuſpidem, quàm cum in medio; hoc
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              prouenit ex eo quod pars illa cum magis diſtet à centro, ſi­
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              cut facilius mouetur, ſic etiam facilius diuertatur, tanquam
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              vectis, cuius fulcimentum centrum conſtituitur in manu
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              gladiatoris. </s>
              <s id="N156A2">Deinde obſeruandum eſt, non cedere
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                dum</expan>
              propriam contrarietatem, ita vt facilè euitetur ictus de­
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              ſcendens per ictum aſcendentem, aut reſiſtentiam illi ex di­
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              recto oppoſitam; ſed ex latere, remouendo ad latus ipſam
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              cuſpidem deſcendentem, nempe dextrorſum, vel ſiniſtror­
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              ſum. </s>
              <s id="N156B3">Quandoquidem impetus ita eſt determinatus ad vnam
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              poſitionem ex vi ſuæ impreſsionis, vt non ſuſcipiat contra­
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              rietatem niſi ab oppoſita. </s>
              <s id="N156BA">
                <expan abbr="Proindeq.">Proindeque</expan>
              idem ferè eſt, moue­
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              re dextrorſum, vel ſiniſtrorſum ipſam cuſpidem circumlati
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              enſis deſcendentem, & ſtantem, vel quieſcentem, eo quod
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              tali dimotio non apponatur directè ipſi deſcenſui, ad quem
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              impetus natura ſua eſt determinatus. </s>
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