Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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modo diſpoſiti: animaduerti poſtea, quòd in ma
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gnete, & in omnibus magneticis corporibus dantur
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duo poli, borealis nempè, & auſtralis, & quotieſ
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cumque duo corpora magnetica ſuper aquam inna
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tantia ad ſeſe propiùs accedunt, tunc quidem polo
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vnius auſtrali vnitur, connectitur que alterius corpo
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ris borealis polus, & ſi contingat vt alitèr diſponan
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tur à violentia aliqua externa, fponte ſua recedunt,
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& indebita conſtitutione ſituantur, tum reſpectu ſui,
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cum reſpectu poli auſtralis Orbis Terræ. </
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conos excauatos ABC, FGH eſſe magneticos, vel
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ferreos virtute tamen magnetica affectos, vt nimirùm
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omnes vertices A, & F ſint poli boreales, partes ve
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rò auſtrales ſint baſes BC, & GH, & quia baſes præ
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dictæ ſunt cauæ poli auſtrales præcisè exiſtent in cen
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tris circulorum BC, & GH. his poſitis innatent iam
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prędicti conuli, ſcilicèt moueri lateralitèr poſſint abſ
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que vllo impedimento, tunc quidem polus borealis
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F coni FGH, ſi coniungi debet iuxtà magneticas le
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ges cum polo auſtrali conuli ABC neceſſariò vertex
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F cum centro circuli baſis BC coniungetur naturali
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inſtinctu, & ideò reſiſtet externæ violentiæ, quæ
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ſituationem perturbare conaretur. </
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vis externa, quæ violentèr inſinuet verticem F intra
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ſinuoſam cauitatem alterius versùs A, tunc quidem̨
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naturali niſu, ceſſante
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violẽtia
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externa, recedet ver
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tex coni FGH ab interna illa poſitione, & denuò re
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trocedet
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eius vertex F coniungatur centro
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circuli baſis BC. </
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