Descartes, René
,
Renati Des-Cartes principia philosophiae
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paullo antèa. </
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<
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>Atque propter iſtam eandem vim, ſi li
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matura, magneti quantumvis forti adhaerens, tangatur
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ab alio debiliori magnete, vel tantùm à ferreo aliquo
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bacillo, nonnullae ejus partes fortiorem magnetem re
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linquent, & debiliorem, ſive ferreum bacillum, ſequen
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tur: illae ſcilicet, quae majori ſuperficie hunc quàm
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illum tangent. </
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<
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>Cùm enim exiguae iſtae ſuperficies va
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ri*ae ſint & inaequales, ſemper accidit, ut quaſdam li
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maturae particulas uni magneti vel ferro, alias alteri
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firmiùs jungant. </
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<
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>Lamina ferrea, quae, polo magnetis admota, ejus
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vim ſuſtinendi ferri multùm auget, ut antè dictum eſt,
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impedit ejuſdem vim ferri ad ſe alliciendi aut con
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vertendi. </
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<
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>Nempe lamina DCD impedit ne magnes
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AB, cujus polo adjuncta eſt,fig
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acum EF ad ſe alliciat aut
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convertat. </
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<
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>Jam enim adverti
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mus particulas ſtriatas, quae
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progrederentur à B verſus EF
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abſque hac laminâ, in eâ reflecti ex C verſus extremi
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tates DD, propterea quòd liberiùs per ipſam quàm
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per ae*rem fluunt, ſicque vix ullae ad acum EF perve
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niunt. </
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<
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>Eodem modo quo ſuprà diximusc, paucas à
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mediâ Terrae regione ad nos pervenire, quia maxima
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earum pars, per interiorem cruſtam ſuperioris Terrae
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regionis, ab uno polo ad alium revertitur; unde fit, </
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