Descartes, René
,
Renati Des-Cartes principia philosophiae
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a nobis vocatur Auſtralis, plus ferri ſuſtineat quàm
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alter, in his Borealibus regionibus: etenim à Terrâ
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maximo magnete juvatur, eodem planè modo ac ma
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gnes C à magnete F; contrà autem alius polus, prop
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ter ſitum non convenientem, à Terrâ impeditur. </
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>Si paullò curioſiùs conſideremus, quo pacto lima
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tura ferri circa magnetem ſe diſponat, multa ejus ope
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advertemus, quae hactenus dicta confirmabunt. </
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<
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>Nam
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inprimis notare licet, ejus pulviſculos non confuſè
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coacervari, ſed unos aliis incumbendo, quoſdam quaſi
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tubulos componere, per quos particulae ſtriatae libe
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riùs quàm per ae*rem fluunt, quique idcirco earum
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vias deſignant. </
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>Quae viae ut clarè ipſis oculis cerni poſ
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ſint, ſpargatur aliquid iſtius limaturae ſupra planum,
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in quo ſit foramen cui magnes ſphaericus ita immiſſus
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ſit, ut polis ſuis utrimque planum tangat, eo modo
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quo Aſtronomorum globi Horizontis circulo immitti
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ſolent, ut ſphaeram rectam repraeſentent, & limatura
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ibi ſparſa diſponet ſe in tubulos, qui flexus particu
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larum ſtriatarum circa magnetem, ſive etiam circa
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globum Terrae, à nobis ſupra deſcriptosb exhibebunt. </
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Deinde, ſi alius magnes eodem modo iſti plano juxta
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priorem inſeratur, & polus Auſtralis unius Borealem
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alterius reſpiciat, limatura circumſparſa oſtendet
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etiam, quo pacto particulae ſtriatae per iſtos duos ma
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gnetes tanquam per unicum moveantur. </
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<
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>Ejus enim
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tubuli, qui ab uno ex polis ſe mutuò reſpicienti
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bus ad alium porrigentur, erunt omnino recti; alii
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verò, qui ab uno ex adverſis polis ad alium </
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