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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num conſulamus annotantem ſe vidiſſe Magnetem ponderis Librar 3,
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qui inermis elevabat tantum Unciam ſemiſſem, armatus autem ge-
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ſtabat Libras 10.</
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<
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<
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<
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<
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xml:space
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">Magnetem ſe habuiſſe, inquit, qui armatus elevabat grana 864,
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ſed idem inermis ſuſtinuit modo grana 54. </
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<
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xml:space
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gnetem fuiſſe, qui inermis vix drachmam, armatus vero Uncias 5
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elevabat Ex quibus obſervatis liquido conſtat, exarmatura plus pon-
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deris geri, quam ex nudo Magnete, quia autem non credibile eſt,
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Magnetes memoratos fuiſſe eodem modo, & </
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<
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armatos, dici nequit vires proportione eadem, aut diverſa ad ele-
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vandum Ferrum acquiri.</
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">Si Magnes ex uno ſui polo poteſt ſuſpenſos tenere aliquot annu-
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los ferreos, ſibi libere appenſos, unus vero ex iis ita ſuſpendatur, ut
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ambos Magnetis polos ſimul tangat, tum hic unus tantum ſuſtineri
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poteſt a Magnete, omneſque alii, qui huic applicantur, deci-
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dunt.</
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<
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">Primo intuitu crederemus vim unitam fortiorem fore, cum enim
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unus polus plures elevat annulos, duo poli plures elevarent, impri-
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miscum multo plus Ferri ex ambobus polis ſimul ſuſpendi poteſt, quam
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ex uno; </
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">Infirmitatis igitur ratio pendebit ex
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figura annulari ipſius Ferri, efficiente, ut vis exiens ex Magnetis
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uno polo, deſtruat eam ex altero, poſtquam contrariâ directione ſibii
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occurrerint, unde nihil amplius ex primo annulo geſtari poterit.</
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jori vi attractrice, quam ſi eadem lamella eidem polo Magnetis in-
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ermis affricta fuiſſet.</
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<
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">Hoc in controverſum vocatum fuit a nonnullis, qui eandem vim
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communicari ab inermi, quam ab armato Magnete ſtatuerunt, cum
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hiſce tamen conſentire nequeo, refragante experientia: </
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