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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perimentis I, II, V. </
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">in diſtantiis æqualium linearum eſſe admodum
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diverſas, in Experimento quinto eſſe majores quam in tertio, & </
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<
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tertio majores quam in primo, mirandum tamen eſt in immediato
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contactu Magnetum vires eſſe easdem, nam ſunt æquales 340 gra-
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nis: </
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<
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">idque eo plus eſt mirandum, cum Magnetes ſuspenſi ex Libra,
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qui tribus memoratis Experimentis inſervierunt, ſunt inæquales quo-
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ad volumina, & </
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<
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<
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">cumque vires
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horum Magnetum etiam ſint valde diverſæ inter ſe, nam præſtan-
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tiſſimus eſt Magnes rotundus primi Experimenti, licet ſit parvus;
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</
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<
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">Sunt vires Magnetis Experimenti quinti mediocriter bonæ; </
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<
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illius adhibiti in tertio Experimento ſunt valde debiles. </
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<
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">Accedit in-
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ſuper, quod in primo Experimento duo globi ſe contingebant, in
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tertio & </
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<
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">quinto globus contingebat planam ſuperficiem: </
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<
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">contactus
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in his tribus caſubus eſt quidem in uno puncto, verum ultra conta-
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ctus punctum ſuperſicies ſphæricæ illico magis a ſe recedendo diſtant,
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quam ſuperficies ſphærica & </
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<
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">Cum mecum hæc omnia atten-
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tius volvebam, incepi dubitare, an quidem Magnetum actio penderet
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ab effluviis quibusdam Magneticis, vel Fluido quodam externo,
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quocunque ſub nomine veniat; </
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di: </
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<
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">Si enim pendeat Actio Magnetum duorum in ſe ab effluviis mu-
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tuis, tum eo erit Actio major, quo effluvia ſunt copioſiora, & </
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copia majori effluent ex Magnetibus generoſioribus, quam ex lan-
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guidis; </
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uſus fui in Experimento primo & </
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in Experimento tertio adhibito: </
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um vires æquales ſunt notatæ.</
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bus Magnetibus, verum indagandum duxi an corundem Magnetum
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poli alteri ſibi obverſi easdem, an varias vires attrahentes exercerent,
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quam bini priores examinati.</
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<
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to inſervierat, iterum ſuspendi ex fune Bilanci annexo, ſed ut po-
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lus alter deorſum nunc eſſet converſus; </
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