Descartes, René
,
Renati Des-Cartes principia philosophiae
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accedunt, vel, ſi unus retineatur cùm ſaltem alter ad
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ipſum venit. </
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CLIII.
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Cur duo magnetes ad
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invicem accedant, &
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quae ſit cujuſque ſphae
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ra activitatisa.* </
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Poli autem cognomines duorum magnetum, non ſic
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ad invicem accedunt, ſed contrà potiùs, ſi nimis prope
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admoveantur, recedunt. </
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<
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>Particulae enim ſtriatae ab
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unius magnetis polo, qui alteri magneti obverſus eſt,
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venientes, cùm hunc alterum ingredi non poſſint, ſpa
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tium aliquòd exigunt inter iſtos duos magnetes quò
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tranſeant, ut ad alium magnetis ex quo egreſſae ſunt
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polum revertantur. </
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<
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po
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lum A, cùm ingredi non poſſint in P
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per ejus polum
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a
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, ſpatium aliquòd
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exigunt inter A &
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a
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, per quòd tran
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ſeant verſus V & B, atque vi, quâ
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motae ſunt à B ad A, pellunt magnetem P;
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egre
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dientes à P pellunt magnetem O: ſaltem cùm eorum
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axes BA &
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ab
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ſunt in eâdem lineâ recta. </
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<
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>Sed cùm tan
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tillo magis in unam partem quàm in aliam inflexi ſunt,
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tunc iſti magnetes ſe convertunt, modo paullò antè
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explicato; vel ſi haec eorum converſio impediatur,
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autem motus rectus, tunc rurſus unus magnes alium
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fugat ſecundum lineam rectam. </
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<
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exiguae cymbae impoſitus, aquae ſic innatet, ut ſem
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per ejus axis maneat ad perpendiculum eretus, &
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magnes P, cujus polus Auſtralis Auſtrali
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ob
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verſus eſt, manu moveatur verſus Y, hinc fiet. </
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magnes O recedat verſus Z, antequam à magnete P
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tangatur. </
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<
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vertat, requiritur ſemper aliquòd ſpatium inter iſtos
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duos magnetes, ut particulae ſtriatae, ex iis
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