Descartes, René
,
Renati Des-Cartes principia philosophiae
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>17. Quòd haec vis in Terrâ, maximo magnete, minùs
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fortis
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appareat, quàm in pleriſque aliis minoribus". </
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>18. Quòd acus à magnete tactae ſuas extremitates
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eodem modo verſus Terram convertant, ac magnes
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suos polos b.
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>19. Quòd eas non accuratè verſus Terrae polos con
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vertant, ſed variè variis in locis ab iis declinent c. </
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>20. Quòd iſta declinatio cum tempore mutari poſſit d. </
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>21. Quòd nulla ſit, ut quidam ajunt, vel fortè qu¬ò`d
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non eadem nec tanta ſit, in magnete ſupra unum ex</
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ſuis polis perpendiculariter erecto, quàm in eo cujus
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poli qualiter à Terrâ diſtant e. </
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>22. Quòd magnes trahat ferrum f. </
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>23. Quòd magnes armatus multò plus ferri ſuſti
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neat, quàm nudus g.
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>24. Quòd ejus poli, quamvis contrarii, ſe invicem
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juvent ad idem ferrum ſuſtinendum h. </
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>25. Quòd rotulae ferreae, magneti appenſae, gyratio
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in utramvis partem à vi magneticà non impediatur i. </
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>26. Quòd vis unius magnetis variè poſſit augeri vel</
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minui, variâ magnetis alterius aut ferri ad ipſum ap
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plicatione . </
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>27. Quòd magnes, quantumvis fortis, ſerrum à ſe
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diſtans, ab alterius debilioris magnetis contactu re
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trahere non poſſit k.
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>28. Quòd contrà magnes debilis, aut exiguum </
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