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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ignitus multum virtutis acquiret a fortiori, ejuſque polus inferior
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nunc non evadet Boreus, ſed Auſtralis, appetetque impetuoſe po-
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lum Acûs nauticæ Boreum: </
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<
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xml:space
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">Si Magnes antequam igni committeba-
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tur, imbecillis fuerit, impoſitus fortiori quamdiu calet, multis vi-
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ribus donabitur, & </
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<
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<
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">Boyle, ſe exploraſſe Magnetem, qui frigidus vix fruſtulum Acus ele-
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vabat, ſed poſtquam candens impoſitus fuerat generoſo Magneti
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donec frigebat, eum geſtaſſe multo plus ferri. </
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<
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xml:space
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">Si Magnes debilis,
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frigensque, fortiori imponatur, virium incrementum acquirit, non
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tamen tam cito, nec tantum, ac ſi Magnes ignitus alteri impoſitus
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fuiſſet.</
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<
s
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">Ignis Magnetem rarefaciendo partes omnes aſe removet, minuſ-
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que cohærentes reddit, ita enim metalla ex duriſſimis ſubſtantiis
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fluida facit, idcirco Magnes generoſus, poſitus infra alium ignitum
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partibuſque facile concutiendis, alioque locandis ordine conſtantem,
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hujus partes ita agitat, ordinat, dirigitque, penetrando per eas ſuâ
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virtute, ut poſtea multo majorem vim attrahentem poſſideant. </
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<
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Magnes frigidus non conſtat ex partibustam facile mobilibus, alio-
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que ordine diſponendis, idcirco frigidi, impoſiti generoſiori Magne-
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ti, partes non tam bene mutantur, aliove ordinantur modo, nec
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totidem viribus imprægnari poſſunt.</
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<
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">Ope hujus methodi convertere polos Magnetum poſſumus. </
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<
s
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">Sunt hæc primaria phænomena, quæ Magnetes ſua directione
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oſtendunt, plura alia omiſi ſtudio, tum quia parvi videbantur mo-
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menti, tum ne nimium prolixus evadam, tranſeundum potius ra-
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tus ad examen directionis Ferri, cum quo accuratiores capi poſſunt
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obſervationes; </
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">nihil autem hic explico, quomodo phænomena fiant,
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cum theoriam Halleyi ſub finem adnectendam eſſe duxi, ſimul cum
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aliquot animadverſionibus, quibus intellectis, quid de cauſa dire-
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ctionum ſtatuendum ſit, liquebit.</
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">Verſorium, vel Acum Magneticam, vel Acum Nau-
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ticam vocamus, vid. </
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dio O capitulo aurichalceo inſtructam, excavatam intus, ut pinnæ
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cupreæ K imponi queat, & </
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verti: </
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