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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rium edidit ſigna, id movendo, ad ſe adducendo repellendoque;
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<
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">crediderim in Magnetibus a memoratis Eruditis examinatis, ejus-
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modi parvas vires quoque ſuperſtites fuiſſe, quas oſtendiſſent, ſi
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potius Verſorio, quam limaturæ Martis fuiſſent appoſiti: </
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<
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xml:space
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">Nam adeo
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vehementiMagnetem urſiIgne, ut dubitem an ſimili expoſuerint deLa-
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nis, Boyleusque ſuos calori, excepto illo, quem focus ſpeculi largitur. </
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ne quis vero opinetur ignem diutius continuatum majores editurum
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effectus in Magnetem, vireſque omnes proſtraturum, infra enim in A-
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naly ſi hujus Lapidis Chemica conſtabit, nunquam igne, etiamſi ſæpius
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repetito, vires ex Magnete omnes periiſſe. </
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<
s
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xml:space
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">Quoniam in præcedenti
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Experimento adſtruximus, Ignem non agere in vires Magnetis, in
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hoc autem liquet Ignem ejus vim admodum imminuere, admirari
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debemus Ignis efficaciam adeo diverſam in unum idemque corpus: </
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ſuſpicabar, intuitus Experimenti eventum, Ignem ex Magnete ex-
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puliſſe nonnullas particulas, ferreas, aliasve, a quibus tota vis at-
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tractrix penderet, hinc ſcobem Martis non amplius ab illo appeti; </
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ſed tutudi Magnetem in pulverem ſubtilem, eique ad duorum trium-
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ve pollicum intervallum oppoſui alium generoſum Magnetem, hic
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totum allexit pulverem, elevavit, geſtavit, ac ſi limatura ferri fuiſ-
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ſet. </
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<
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">Non igitur ex Magnete ignis expulerat illas particulas, in qui-
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bus vis attractrix reſidebat, tum enim pulvis hic iners jacuiſſet, nec
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alteri advolaſſet Magneti, eo autem indicabat in ſe attrahendi ſu-
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pereſſe vim, cum nulla detur actio, ubi reactio non ſimul adſit,
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omniaque corpora ſeſe æqua vi & </
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">Ignis figuram pororum in hoc Lapide mutaverat, levior enim,
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rubicundioriſque coloris evaſerat, ſed ideo non poteſt dici virtutem
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ſuam amiſiſſe, quid enim porus eſt, præterquam pars ſpatii, quod
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ſua natura eſt iners, & </
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">ſive terminis hoc illove modo poſitis cir-
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cumſcribatur, vires acquirere nequit, quamobrem pororum im-
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mutata figura nequit ſtatui cauſa jacturæ virium: </
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<
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">egit tamen ignis
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in aliquid, quod fuit in Magnete, egit procul omni dubio, in ali-
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quid quod corporeum eſt: </
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<
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">ita autem in illud operatus fuit, ut cum
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antea vires attrahendi magnas habebat, nunc eas aliquomodo ex-
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pulerit, aut potius ad ſilentium redegerit, nam in pulvere Magne-
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tico iterum obſervabatur, & </
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">ab altero Magnete excitatum revi-
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viſcebat iisdem viribus, quibus unquam donatum fuit: </
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