Descartes, René
,
Renati Des-Cartes principia philosophiae
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gnetes reperiri, quàm in aliis: quo fit, ut particulae
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ſtriatae, à terrâ interiori egredientes, majori copiâ ver
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ſus quaedam loca fluant, quàm verſus alia, ſicque ab
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itineribus ſuis ſaepe deflectant. </
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>Et quia polorum ma
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gnetis, vel extremitatum acûs, converſio pendet à ſolo
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curſu iſtarum particularum, omnes earum inflectio
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nes ſequi debet. </
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>Hujuſque rei experimentum facere
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licet in magnete, cujus figura non ſit ſphaerica: nam
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ſi acus exigua ſupra diverſas ejus partes collocetur,
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non ſemper eodem planè modo ad ejus polos ſe con
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vertet, ſed ſaepe ab ipſis aliquantum declinabit. </
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putandum eſt in eo diſparem eſſe rationem, quòd inae
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qualitates, quae ſunt in extimâ terrae ſuperficie, ad
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totam ejus molem comparatae, perexiguae ſint; non
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enim cum ipſâ, ſed cum acubus & magnetibus in
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quibus declinatio fit, ſunt comparandae, ſicque ſatis
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magnas eſſe apparet. </
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<
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>Sunt qui dicunt, iſtam declinationem non ſemper
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in iiſdem terrae locis eandem manere, ſed cum tem
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pore mutari. </
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>Quod minimè mirum videri debet: non
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modò quia ferrum quotidie ex unis terrae partibus
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in alias ab hominibus transfertur, ſed etiam quia ejus
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glebae, quae ſunt in hac terrâ exteriore, quibuſdam in
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locis cum tempore corrumpi poſſunt, & aliae in aliis
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generari, ſive ab interiore terrâ ſubmitti.* </
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25</
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<
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>Sunt etiam qui dicunt, iſtam declinationem nullam
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eſſe in magnete ſphaerico*, ſupra polum ſuum Auſtra
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lem in his Borealibus regionibus, vel ſupra Borealem </
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