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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ordinata, tum invertatur Magnes, & </
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commoveatur; </
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">primo limatura hærebit quaſi anceps, neſcia quor-
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ſum ſe vertat cadatque, ſed repetito Magnetis itu erigitur, & </
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contraria directione, quam qua Magnes movebatur.</
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<
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xml:space
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">Si autem ſupra limaturam Ferri Magnetem protraxeris, erigitur
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rectà ea limaturæ pars, quæ Magneti ſubjacet, cæteroquin ſequitur
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motum Magnetis, unde ipſo moto dextrorſum, limatura cadit dex-
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trorſum, & </
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">Optime fit hoc Experimentum limaturam ſpar-
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gendo ſupra tenues laminas metallicas: </
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<
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xml:space
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">Lucretius quondam hoc in-
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ſtituiſſe videtur, cum canebat,
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Exſultare etiam Samothracia ferrea vidi,
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Et ramenta ſimul Ferri furere intus ahenis
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In ſcaphis, lapis hic Magnes cum ſubditus eſſet,
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Vſque adeo fugere a ſaxo geſtire videtur
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Ære interpoſito, diſcordia tanta creatur.</
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<
s
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">Quemadmodum eriguntur caduntque partes ſcobis in hoc Experi-
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mento, ita erigi diſponique partes in ſolido Ferro, quod Magneti
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aſſricatur, opinatus fuit Gaſſendus, ideoque in Ferro partes jacere
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ſiniſtrorſum Magnete ſuper ipſo ducto dextrorſum, & </
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<
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">contra, veluti
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campus frumento conſitus ariſtas verſus unum latus a vento afflante
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jacentes gerit, & </
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mihi partes ſolidi Ferri fortius cohærere videntur, quam ut a vi
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Magnetica ita ordinarentur: </
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<
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">ſedeo conceſſo, non clarius intelligitur,
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quomodo ex ejuſmodi partium ſitu vis attrahendi aliud Ferrum ſe-
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quetur, aut quid ſitus ad directionem Ferri verſus aliquas cæli pla-
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gas conferet, niſi fluidum advocetur.</
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<
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">Explicantur autem memorata phænomena facile, modo in ante-
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ceſſum notemus, parva fragmenta Acuum oblonga, loco ſcobis
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impoſita plano, a Magnete infra moto, plane eodem modo erigi, & </
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cadere ad oppoſitam partem ac Magnes movetur; </
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terit| conſiderari, inſtar congeriei exiguorum, ſed oblongorum fra-
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gmentorum: </
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<
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hæc erigetur ſupra planum perpendiculariter, atque ambas extre-
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mitates nanciſcitur polares, quarum ea, quæ plano contigua, eſt
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polus alterius nominis, quam Magnetis, planum ibi tangentis, (poli
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enim Magnetum diverſi nominis tantum ſe attrahunt), </
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