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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lo B, ſeparabitur a reliquis. </
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perimentum etiam optime inſtituitur cum acubus, quæ ex ſuis ſu-
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ſpenſæ extremis, ſibi adhæreſcendo longam conſtituunt ſeriem, ſi
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circa infimam Magnes B S circumagatur, eam fugabit, atque in
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circulum deducet, uti etiam eleganter adnotavit Cl. </
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<
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Meditat, Ingen. </
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mæ obferatur, hæc illi advolabit extemplo.</
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Ferrum, jacens in plano horizontali lævigato, alterique extremo
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Ferri polus alterius nominis, ſed Magnetis debilioris virtutis appli-
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cetur, huic Magneti lente retro tracto, ut Ferrum in plano ma-
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neat, ſæpe adhærebit Ferrum, avulſum a fortiori Magnete.</
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<
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Magn. </
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A°. </
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rallele ad axin Magnetis, acus extremo apponatur regula ferrea, quæ
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ei adhærebit tam firmiter, ut regula eam circum ducere circa totum
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Magnetem queat, & </
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rula ferrea B, attracta, atque regula ferrea C D tetigerit punctum
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Sphæræ oppoſitum puncto contactus cum Magnete; </
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C D adimere Sphæram a Magnete, ſed ſi Magnes debilium fuerit
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virium, tum regula non poterit Sphæram B a Magnete avellere: </
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reis, quarum ea minima erat, quæ adhærebat Magneti, notat, </
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