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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Magnetis & </
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operam impendi, ut detegerem proportionem inter tempora, quibus
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motus dabatur, & </
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nicitatem virium Magneticarum invenirem, ſed nimia celeritas pro-
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hibuit hucuſque, quo minus aliquid accurati determinem: </
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tamen hoc rude tentamen mihi viſum fuit, quam ut ſilentio preme-
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retur.</
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Verſorium a polo Magnetis attrahitur, cuſpide alterius nominis
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verſus polum directa; </
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<
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codem plano horizontali, & </
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cognominibus eandem plagam ſpectantibus, dirigetur Acus verſus me-
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dium interſtitii inter ambos relicti Magnetes, in quo loco eſt cen-
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trum virium Magnetum, haud aliter fere ac centrum gravitatis in-
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ter duo ſejuncta corpora intermedium jacet. </
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juxta priorem poſiti, polus ſit alterius nominis, Verſorium dirigi-
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tur, ut ſit perpendiculare ad amborum Magnetum axes, tum enim
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cuſpis illius æque attrahitur ab uno, quam repellitur ab altero ſe-
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cundi Magnetis polo.</
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cumverti poterat, impoſitus alligatuſque fuit Magnes C, ita ut axis
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perpendiculariter inſiſteret horizonti, polus autem Boreus ſurſum
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ſpectaret: </
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immobili; </
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campana vitrea, ne a motu aëris per circumgyrationem tabulæ A
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B, turbaretur, admovebatur Verſorium tam prope Magneti C, ut
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intra ejus virtutis ſphæram hæreret: </
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velociter circumagebatur, in principio viſa fuit Acus oſeillari nunc
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dextrorſum, nunc ſiniſtrorſum, primum ſitum relinquendo parum-
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per: </
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ſorium manſit fixum in ſuo meridiano, neque ullum motus minimi
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dedit ſignum.</
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