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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xml:space
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">Hoc ſubtiliſſime primus obſervavit Whiſtonus: </
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<
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quod ſuper Magnete ductum fuit, & </
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">vires accepit, hæret quaſi in
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centro virium ad aliquam diſtantiam diffuſarum, & </
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& </
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<
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xml:space
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">Ferri ſibi obviam quaſi eunt, atque in intermedio ſpatio in ſe a-
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gunt; </
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<
s
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xml:space
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">niſi Ferrum, vi donatum, mobilius ſit altero, & </
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<
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xml:space
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">ideo ab exi-
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lioribus Magnetis viribus in diſtantia majori commoveri poſſit.</
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s
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xml:space
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">Si Magnes homogeneæ ſubſtantiæ undiquaque obruatur limatura
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Ferri tenuiſſima, vel pulvere Indico, nullum fere erit in ſuperſicie
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punctum, cui attracta limatura non adhæret: </
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<
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">majori tamen copia adhæ-
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ret angulis & </
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<
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">polis, quam lateralibus planiſque Magnetis partibus; </
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">at-
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trahit igitur omne punctum Magnetis Ferrum, etiamſi non æque valide.</
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<
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">æquabiliter ſpargatur ſupra corporis non
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admodum denſi ſuperficiem planam (ne quidem Ferro excepto) & </
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Magnes directe infra id corpus ponatur, alterutro polo ſpectante
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ſurſum, primo plurimæ particulæ limaturæ conjungentur in formam
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oblongæ Acus, illæ perpendiculariter ſupra ſuperficiem erigentur,
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quæ directe e regione poli Magnetis ſunt: </
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<
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">moto Magnete dextror-
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ſum ſecundum longitudinem plani ſuſtinentis, cadunt omnes partes
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limaturæ ſiniſtrorſum; </
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<
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">redeunte Magnete ſiniſtrorſum, eriguntur
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partes, caduntque dextrorſum: </
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<
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">idem ſpectatur effectus, quicun-
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que Magnetis polus ſurſum fuerit converſus. </
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<
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xml:space
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">Poſt itus reditusque
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aliquot Magnetis infra planum ſuſtinens ſcobem, ordinatur lima-
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tura in ſeries oblongas.</
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</
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<
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xml:space
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">Si pars Magnetis lateralis plano obverſa, ſed infra illud promo-
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veatur dextrorſum, vel ſiniſtrorſum, etiam erigitur limatura, ca-
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ditque contraria directione, quam qua Magnes movetur, cadit tamen
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paulum oblique, magis nempe a polis utrimque attracta, quam a
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meridiano Magnetis.</
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</
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<
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">Si aliquoties infra planum Magnetem, alterutro polo ſurſum ſpe-
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ctante, dextrorſum & </
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