Descartes, René
,
Renati Des-Cartes principia philosophiae
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ut debilis tantùm vis magnetica totius Terrae hîc apud
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nos ſentiatur. </
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<
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>Sed praeter ferrum aut magnetem, nullum aliud cor
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pus in locum laminae CD poni poteſt, à quo magnes
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figAB impediatur, ne vim
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in acum EF exerceat. </
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<
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>Nullum
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enim habemus, in hac exte
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riore terrâ, quantumvis ſoli
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dum & durum, in quo non ſint
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plurimi meatus: non quidem ad
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particula
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rum ſtriatarum efformati, ſed multò majores, utpote
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qui etiam globulos ſecundi elementi recipiunt, & per
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quos idcirco iſtae particulae ſiriatae non minùs liberè
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tranſire poſſunt quàm per ae*rem, in quo iſtos etiam
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globulos ſecundi elementi obvios
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15</
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<
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>Si ferrum aut magnes diu detineatur aliter conver
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ſus ad Terram alioſve vicinos magnetes, quàm ſponte
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ſe converteret ſi nihil ejus motum impediret, hoc
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ipſo vires ſuas paullatim amittit: quia tunc particulae
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ſtriatae, ex Terrâ vel aliis magnetibus vicinis</
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adve
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nientes, obliquè vel averſè ipſius meatibus occurrendo,
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paullatim eorum figuras mutant & corrumpunt. </
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20</
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<
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>Denique vis magnetica humiditate, rubigine, ac ſitu
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valde minuitur; & valido igne planè deletur. </
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<
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>Rubigo
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enim, ex ferri ramentis effloreſcens, meatuum
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occludit; idemque praeſtat ae*ris humiditas & ſitus,
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quia rubiginis initia ſunt. </
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<
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>Ignis autem agitatio iſtorum
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ramentorum poſitionem planè diſturbat. </
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<
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>Nihilque puto </
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