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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DISSERTATIO
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xml:space
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">Communis eſt ſententia, Ferrum ſuper polo Magnetis ductum vi-
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ribus attrahentibus imprægnari, eam tamen obſervatione oppoſita
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dubiam olim reddidit Cl. </
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<
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xml:space
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">de La Hire in L’Hiſt. </
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<
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xml:space
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">Quum virgæ ferreæ, 6 pollices longæ, 4 lineas craſſæ,
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præſtantem Magnetem aliquoties applicatum nullas attrahendi vires
<
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communicaſſe memorat, etiamſi virgis tenuioribus quamplurimum
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virtutis impertiretur, quamobrem determinatæ craſſitiei deſidera-
<
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retur Ferrum, quod a Magnete vim recipere poſſet, nequaquam
<
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ad id conducente Ferro admodum craſſo: </
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<
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xml:space
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">examine dignum viſum
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fuit hoc Experimentum, ut inde cognoſceretur, quomodo Magnes
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cum Ferro vires ſuas communicat: </
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<
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">Parallelopipedum ferreum, 6
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longum pollices, unum latum altumque; </
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<
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">ſuper Magnetis, (cujus
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pondus erat 1 {1/4} libræ, & </
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<
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">tanta vis, ut ex armatura 7 Librarum ge-
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ſtaret) polo aliquoties juxta longitudinem ductum fuit, hujus pla-
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næ extremitati, æque ac marginibus & </
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<
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Indicus, & </
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<
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">ſcobs ferrea attracta, ab angulo aut margine Acus te-
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nuiſſima, vix {3/4} ponderis grani, parumper attrahebatur, non tamen
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tota geſtari potuit; </
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<
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">quamobrem hoc Ferrum vi Magnetica, licet exi-
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gua, imprægnatum fuiſſe, liquido conſtabat: </
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<
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fuit, an eadem moles ferrea majores acquireret tempore longiori
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ab eodem Magnete vires, hæc applicata ideo diei ſpatio Lapidi man-
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ſit, tum iterum pulveri Indico immiſſa, Acui chalybeæ tenui ap-
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poſita, eaſdem, non majores, attractrices vires oſtendit, quas
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nec auxerunt repetiti eidem Magnetis polo affrictus.</
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<
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4 pollicum & </
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minabantur, altera conica; </
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<
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{2/10} pollicis: </
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<
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<
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hoc ſecundum totam longitudinem aliquoties ſuper Magnetis polo
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ducto, tum perpendiculariter ſuſpenſo ad horizontem, baſi circu-
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lari deorſum ſpectante, appoſita fuit Acus chalybea nova, graviſſi-
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ma, quæ elevari poterat, quod variis explorabatur tentaminibus,
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tum vix ex circulari ſuperficie ſuſtenta fuit Acus tenuiſſima, </
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