Musschenbroek, Petrus van
,
Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae
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DE MAGNETE.
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ipſum tranſire Ferrum, & </
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mur hic tamen Clavim B K non tantopere trahi a Magnete A, quam
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a clave C, huic enim adhæret, non Magneti; </
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<
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cauſa attractionis, ſolvuntur enim illico a ſe claves, ſimulac altius
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ſupra Magnetem elevantur: </
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gnete, fortius trahit clavim B, quam Magnes A eam trahit? </
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<
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tan aliquis opinaretur clavim B non trahi a Magnete, ſed repelli
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contra C, quod verum non eſt; </
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<
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">nam trahitur B fortiſſime a Ma-
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gnete; </
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<
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">hoc pater, ſi polus Magnetis fuerit in E, & </
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<
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">clavis B circa
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eum circulariter, ſed ad notabilem diſtantiam, in latioris ſcilicet
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circuli peripheriâ, circumferatur, pars K inferior verſus E trahetur,
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totaque clavis ſitum acquiret valde obliquum, & </
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<
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perficiem conicam deſcribere videbitur: </
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<
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">in inſtituendo hoc Expe-
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rimento præterea obſervatur, axe Magnetis perpendiculari ad ho-
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rizontem poſito, claves altius ſupra Magnetem attolli poſſe ſalvâ at-
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tractione, quam axe horizonti parallelo: </
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gnetis ſurſum ſpectaverit, tum omnium altiſſime & </
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lapide intervallo claves attolli poterunt ſuperſtite cohærentia mu-
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tua.</
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& </
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">ex ſeſuſpenſi attrahantur ſerie rectâ ad horizontem perpendiculari
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a polo A Magnetis P A, deinde polus cognominis A, alterius Ma-
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gnetis B lente admoveatur globo infimo E, a quo notabili adhuc
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remotus intervallo, ſeparabit globum E â D, totamque globorum
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ſeriem D C fugabit, obliquum ei ſitum dando.</
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ſe invicem fugare; </
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globorum ſeriem E D C, directione ab E ad C, adeoque
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omnes globorum infimæ partes erunt poli cognomines ipſius A,
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& </
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tis B S polo B cognomine ipſius A, hoc eſt infimarum partium glo-
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borum, debebunt hæ omnes a polo B fugari, ſi vis fugans ipſius
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B, ſit major vi trahente poli A in globum remotiſſimum E, in quem
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parum tantummodo operari poteſt, globus E fugatus nimium a </
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