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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quod probare videretur Magnetem in Vacuo viribus minoribus pol-
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lere quam in aëre aperto; </
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<
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xml:space
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">verum Ferri delapſum potius eveniſſe ſu-
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ſpicor ex motu concuſſionis cum Magnete communicato, qui inter
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evacuandum non poteſt non contingere; </
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<
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ferrea gravior eſt, quam in aëre, quod nonnihil ad lapſum ejus
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faciliorem reddendum contulit. </
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<
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">Cæteroquin in vacuo recipiente
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Magnetem in Verſorium operari facillime demonſtratur, modo am-
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bo eidem includantur recipienti, eductoque aëre Magnes circa Ver-
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ſorium vertatur, hocinſtar obedientiſſimi Magnetis pediſſequi, ipſum
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ſequitur, moveturque vel ad minimos illius motus, quod modo
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paulum a noſtro differente etiam experientiâ comprobavit Boy-
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leus.</
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<
s
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xml:space
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">Tum ex noſtro, tum ex Experimento Boyleano conſtat eviden-
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ter, Magnetem in aëre rariori non plus ponderis geſtare quam in
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denſiori, quare opinor erroneam eſſe Hartſoekeri obſervationem in
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L’Eclairciſſ. </
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<
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elevare, quo aër Atmosphæricus foret levior, & </
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<
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roſcopio depreſſior: </
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<
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">Tutius concludam, aëris raritatem aut denſi-
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tatem nihil diverſitatis attrahentibus viribus adferre, nec VacuumBoy-
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leanum augere, aut imminuere vires: </
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<
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xml:space
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">Admiratus profecto fui Stur-
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mii, judicioſi cæteroquin Viri errorem, opinantis ab aëre elaſtico
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effectus Magneticos pendere, ejuſque gravitate apprimi Magnetem
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ad alterum aut ad Ferrum, ſed optime errorem hunc detexit Cele-
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berrimus Wolfius.</
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">Primus non ſum, qui Magnetum vim per omnia penetrantem
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corpora notavi; </
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<
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">attamen eam accurate eandem manfiſſe abſque ul-
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lo decremento non novi demonſtratum hactenus; </
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<
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<
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">de Magnete memoriæ prodidit, Magnetis vim tranſire per aquam,
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pyxidem, aut vas; </
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<
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">non enim, inquit, obſtant craſſa tabulata, non
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figulina, non marmorea vaſa, nec metalla ipſa: </
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quod vires tollat aut impediat. </
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uti non tollunt virtutem ejus, nec viam obſtruunt, ita neque ullo
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modo impediunt, diminuunt, aut retardant. </
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2. </
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bendo kircherum plane eadem notat in Magia Magnetica Cap. </
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§ 1. </
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