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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<
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<
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xml:space
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">Quo plures laminæ Magnetem hunc componant, quo longiores
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fuerint, quo ſupra liberaliorem ductæ lapidem, eo præſtantioris
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virtutis erit; </
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<
s
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xml:space
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">nam ſingulæ lamellæ inſtar Magnetis ſunt, unius vis
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adjuvat eam alterius, hinc aucto lamellarum numero, etiam ſum-
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ma virium augetur, quemadmodum Magnetes plures in unum bene
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coagmentati majorem vim attrahendi habent, quam unus alterve
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ſeorſim ſumtus: </
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<
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xml:space
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">Non tamen quantitas virium attrahentium adutrum-
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que armaturæ pedem ſequitur numerum lamellarum, ſed eſt in mi-
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nori ratione, quia quo vis a pede plus diſtat, eo minor evadit, uti
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ſuperius quoque demonſtravi in Magnetibus majoribus, quorum vis
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ſemper eſt proportionaliter minor, quam in minoribus: </
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<
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xml:space
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">Memoranda hic
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eſt obſervatio Hartſoekeri, quam inſeruit ſcripto, cui titulus Eclairciſ-
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ſemens des Conjectur. </
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<
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<
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<
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">92. </
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<
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xml:space
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">Vires attractrices, ſingularum
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laminarum, quæ ejuſdem magnitudinis cum deſcriptis ſunt, deprehen-
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dit eſſe 6 unciarum; </
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<
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xml:space
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">Magnes ex 18 ejuſmodi laminis compoſitus eleva-
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bat pondus ferreum 6 vel 7 librarum: </
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<
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xml:space
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">Elapſis ſex ſeptimanis Magnes
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hic fortior evaſit, & </
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ſeorſim examinatæ imbecilliores erant, ferentes tantum unciam ſes-
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qui, aut uncias duas; </
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<
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xml:space
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">hæ denuo ſibi impoſitæ, tantundem quam
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ante diſſolutionem geſtabant, interim earum ambo poli viribus æ-
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qualibus gaudebant. </
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<
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xml:space
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">Nec de obſervatione dubitandum, quia idem
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deprehendi in meo artiſiciali Magnete; </
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<
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xml:space
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">videtur vis Magnetica in
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principio ab armatura lamellarum non tam bene capi potuiſſe, quam
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quidem aliquo elapſo tempore, præterea per unitam maſſam æqua-
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biliter diſtribuitur pedetentim, ita ut ambo ejus poli æquale pondus
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geſtare queant.</
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">Filum ferreum tenue, admodum flexile, ſuper Magnete ductum,
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ejus viribus imprægnetur, deinde flectatur in varias formas, & </
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<
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verſos angulos; </
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<
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">ſint flexiones tam validæ, ut ſignum inflexio-
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nis, ſive exaſperatæ ſuperficiei poſt ſe relinquant, omnis plerum-
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que vis attractrix profligata ex filo obſervabitur.</
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">In his inflexionibus ſitus partium mutatur, aliis ſe contingenti-
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bus poſt flexionem, quam ante, nihil ſubſtantiæ periit, nihil </
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