Descartes, René, Renati Des-Cartes principia philosophiae

Page concordance

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              unoquoque ex iſtis inſtrumentis magis minuſve fragi­
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              litas eſt vitanda quàm durities optanda; & ideò dum
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              certis liquoribus ita mergitur, non immeritò dicitur
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              temperari. </s>
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              CXLIII.
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              Quomodo chalybs tem­
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              peretur. </s>
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              30</s>
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              5</s>
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              10</s>
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              15</s>
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              20</s>
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              25</s>
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              30</s>
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              Quantum autem ad meatus recipiendis particulis
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              ſtriatis idoneos, ſatis quidem patet ex dictis a, permul­
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              tos tam in chalybe quàm in ferro eſſe debere; ac etiam
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              eos eſſe in chalybe niagis integros & perfectos, ramu­
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              lorumque extremitates in ipſorum ſpiris eminentes,
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              cùm ſemel in
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              unam partem flexae ſunt, non fam facilè
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              in contrariam poſſe inflecti, quanquam etiam in hoc
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              faciliùs, quàm in magnete ſlectantur; ac denique
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              omnes iſtos meatus, non in chalybe aut alio ferro, ut
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              in magnete, orificia ſua recipiendis particulis ſtriatis
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              ab Auſtro venientibus idonea, in unam partem, & ido­
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              nea recipiendis aliis à Boreâ venientibus, in contra­
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              riam convertere; ſed eorum ſitum varium atque in­
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              certum eſſe debere, propterea quòd ignis agitatione
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              turbatur. </s>
              <s>Et in breviſſimà illà niorâ, quâ haec ignis
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              agitatio frigore ſiſtitur, tot tantùm ex iſtis meatibus
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              verſus Auſtrum & Boream converti poſſunt, quot par­
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              ticulae ſtriatae, à polis Terrae venientes, ſibi tunc tem­
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              poris per illos viam quaerunt. </s>
              <s>Et quia iſtae particulae
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              ſtriatae omnibus ferri meatibus multitudine non reſ­
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              pondent, omne quidem ferrum aliquam vim magneti­
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              cam accepit ab eo ſitu, quem habuit reſpectu partium
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              terrae, cùm ultimò candefactum refriguit, vel etiam ab
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              eo in quo diu immotum ſtetit, ſi diu in eodem ſitu ſte­
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              terit immotum; ſed pro multitudine meatuum quos
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              in ſe continet, poteſt habere adhuc majorem. </s>
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