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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nomena, & </
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<
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">pauciſſima quæ ab animo intelligi poſſunt noſtro, hæc
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ab Exp. </
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comprehenduntur.</
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<
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">EXPERIMENTUM LI.</
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">Si aliquot Acus vulgares, vel laminæ parvæ ferreæ ponantur in
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ſerie quadam juxta ſe invicem, Magnete attingente unam Acum vel
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laminam, cohærebunt omnes inter ſe & </
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<
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xml:id
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xml:space
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">cum Magnete, cohærebit
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tamen fortius ſecunda cum prima, quam tertia cum ſecunda, vel
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quarta cum tertia, erit enim eo minor cohærentia, quo Acus vel
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virgæ magis â Magnete diſtiterint: </
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<
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xml:space
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">tranſit igitur vis Magnetis ex Fer-
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ro in Ferrum; </
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<
s
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xml:space
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">aut ſuſcitata vi Magnetica in hoc Ferro, ſuſcitatur quo-
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que in vicino, & </
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<
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<
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">Effectus hiſce ana-
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logi conſpiciuntur in duobus turbinibus ferreis, quorum hic attin-
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git Magnetem, alter ex priori ſuſpenditur, ambobusſe contingen-
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tibus in puncto, cohærent tamen attracti vi Magnetica, poteſtque
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in gyrum velocem & </
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<
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">oppoſitæ directionis uterque moveri, gyratio
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enim attractionem non tollit.</
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">EXPERIMENTUM LII.</
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">Si lamina ferrea Magneti affricetur ſecundum longitudinem ſuam,
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pars, quæ ultimo Magnetem tetigit, plus virium habet, quam quæ
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primo applicabatur Lapidi, ut igitur extremitas Ferri imbecillior
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eaſdem vires ac altera recipiat, affricanda eſt polo oppoſito Ma-
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gnetis.</
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">Regula Chalybea temperata ſecetur in aliquot partesrectangulas,
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quæ omnes ſuper lamina poſitæ cuprea diverſo ſitu juxta ſe invicem
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quam antea cohæſerant, bene apprimantur, ut quaſi corpus unitum
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forment: </
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<
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">Supra hunc apparatum tranſeat Magnes fortiter appreſſus,
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tum regula viribus imprægnabitur, eo majoribus, quo partes ſe ar-
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ctius contigerint, ſi autem vix ſe contigerint, non niſi paucæ cum
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iis communicatæ erunt vires,</
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