Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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

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