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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DE MAGNETE.
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detur Doctiſſimus Hambergerus ſimile aliquid obſervaſſe inProgram-
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mate Inaugurali de Partialitate Acus Magneticæ, cujus obſerva-
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tiones, etiamſi non accurate cum noſtris conveniant, non dubito
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quin veræ ſint, & </
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<
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">bene adnotatæ, nam dabitur in his Experimen-
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tis ſemper diſcrepantia, pro varia tempeſtate diei, anni, longitudine
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& </
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<
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">ſtructura Ferri, tum pro vario Magnete, qui in uſum vocatur:
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<
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">Acum, inquit, in ſuperficie ſuperiori polo Magnetis Boreali ſtrinxi
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ab extremitate verſus centrum, hæc impoſita ſtilo, nec ſeſe ſponte
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verſus Septentrionem dirigebat, ſed in quovis fere ſitu quie ſcebat,
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aliqualem tamen conatum ſeſe dirigendi verſus Septentrionem obſer-
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vabam: </
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">Nobis autem ſemper contigit obſervare Acum accurate dirigi
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in Meridiano Magnetico, etiamſi non tetigerit Magnetem, verum
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centrum O AcûsTab.</
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<
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">9 probe deterſum fuit a ſquammis, quæ igni-
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tione oriuntur, & </
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<
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">pergit deinde, Ad-
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moto polo Magnetis Boreali ad Acus cuſpidem, hæc recedebat a Ma-
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gnete, cauda Acus haud accedebat, ſedtota Acus poſt aliquot vibrationes
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reciprocas ita ſubſiſtebat, ut ad lineam per polos Magnetis ad
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centrum Acus ductam eſſet perpendicularis, admoto vero polo Ma-
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gnetis Auſtrali ad caudam, hæc ad polum accedebat, ejuſque mo-
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tum ſequebatur, eodem polo ad cuſpidem accedente, etiam hæc ac-
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cedebat ad polum Magnetis, eumque commotum ſequebatur, minori
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tamen celeritate quam cauda. </
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">Polus ergo Magnetis Auſtralis utrique
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extremo amicus, ipſa vero acus reſpectu totius Magnetis partialis
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erat. </
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">In noſtro Experimento utraque Verſorii extremitas erat amica
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polo Boreo alterius Verſorii, quod directe eſt oppoſitum obſervationi
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Hambergeri; </
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cum obſervationibusHambergerianis, nam Verſorii utraque extremitas
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erat amica polo Auſtrali alterius; </
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">adeo Natura in Magneticis luxuriat,
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ut oppoſitos nonnunquam effectus producat, quibus virium ſuarum
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cauſam magis occultando, cum mortalium ſolertia late ludit, arrogan-
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temque ſagacitatis fiduciam compeſcit. </
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quomodo in tentamine primo ambæ Verſorii extremitates a cuſpide
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eâdem alterius Verſorii attrahebantur: </
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mitasAuſtralis aCuſpideBorea alterius ante ullum Magnetis contactum
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attrahebatur, vis hæc in Ferro longiſſimo permanſit, etiamſi Ma-
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gnes extremo oppoſito fuerit applicatus: </
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