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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parallelopipedo, vires ſuas transfudit per omnem hunc apparatum
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uſque ad Limaturam ſuperiorem, quam erexit ut ante, unde non
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modo vis tranſit per ſolidum Ferrum, ſed per interruptum, imo per
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diſſolutam Scobem uſque in ſolidam maſſam.</
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">Ponantur duo Magnetes juxta ſe invicem, ita ut amborum poli
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cognomines ſurſum ſpectent, atque in eadem ſint altitudine, his impo-
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natur ſpeculum vitreum, ſuper quo ſparſa Scobs ferrea ordinatur
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in eaſdem ſeries formaſque, quas alteruter Magnes formaviſſet, niſi
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quod in loco inter ambos polos medio, ſit centrum polare ſive cen-
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trum virium, quod pro uno polo habendum eſt: </
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jorem quaquaverſum latitudinem vis diffuſa conſpicitur, ambobus
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Magnetibus ſe mutuo adjuvantibus.</
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bus ſurſum ſpectantibus, quorum ſuperſicies ſint planæ & </
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jungantur ſecum invicem, ſed ita, ut inter ambos A & </
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C lamella tenuis, ferrea; </
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">aſſeri iis impoſito inſpergatur limatura
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Ferri, hæc diſponetur in ſeries, quas repræſentat figura, in qua
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locus polaris fortiſſimi Magnetis B ſatis bene indicatur, cæteroquin
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ſupra laminam C vix conſpicitur aliquid Scobis, & </
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cum omnia ſunt confuſo ordine poſita.</
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">Differt hoc Experimentum a præcedenti, lamellâ C ferreâ inter-
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poſitâ, quæ omnes has irregularitates attractionis producit, impe-
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diendo quominus poli ambo ſe conjungant in medio, polum vi-
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rium communem faciendo, ſed efficit ut vires utriuſque Magnetis
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diſtinctæ maneant; </
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">quia autem Magnes B præſtantior eſt quam A,
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ad latera ſe ſpectantia vires ſuas fortius emittit, quæ tranſilientes
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ſepimentum ferreum, ordinem Limaturæ ab A factum perturbant.</
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