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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quæ duo magnam ſequelam in Phyſica ſecum traherent, nec parvam
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mutationem Philoſophiæ, inprimis Newtonianæ inferrent.</
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<
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xml:space
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">Sit Acus nautica poſita in meridiano ſuo A B,
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incluſa capſulæ cupreæ, quæ ſuperne tegatur vitro, cujus margi-
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nes ope cæmenti conglutinentur cum capſula, ne ullus aër egredi aut
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ingredi in capſulam queat, Magnes C ponatur fixus in quadam ab
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Acu diſtantia, ita ut hæc cuſpidem A dirigat, in a b, a ſuo meri-
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diano ad certum gradum, qui obſervetur; </
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">tum in vaſe cupreo D
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aër condenſetur ope Antliæ pneumaticæ, quantum fieri arte poteſt;
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</
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">ponatur vas D eo modo infra rectam lineam A B C continuatam,
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ut orificium D directe illi reſpondeat, tum aperiatur ſubito orifi-
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cium D, atque attendatur an Acus A moveatur: </
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">aër ex æneo vaſe
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erumpens vehementiſſium excitabit ventum, aliquamdiu duran-
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tem, interim tamen Acus manere obſervatur immota: </
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iterum Effluvia Magnetica, velaliud fluidum ex Magnete dirigi ad A-
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cum, rogo, an hujus fluidi motus ab impetuoſiſſimo vento non aliquo-
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modo mutabitur, & </
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">proinde interea vis Acus directrix ab a verſus
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A aget, hæc enim antequam aperiebatur orificium D, cum vi at-
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tractrice Magnetis erat in æquilibrio, quod ſi hic ventus dicatur
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nihil poſſe agere in illud fluidum, cujus igitur erit naturæ? </
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non corporeæ! nam fieri nequit, ut ventus artificialis denſiſſimus,
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qui ventum naturalem impetu & </
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illud non agat, nec ſurſum propellat ejusque motum turbet; </
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niam vero nulla turba nulluſque in Acu a b, obſervatus fuit motus,
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iterum tum Effluvia Magnetica, tum quodcumque aliud Magnetem
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ambiens ſuppoſitum fluidum, utcunque ſubtile, vi hujus Experi-
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menti proſcribuntur.</
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in Meridiano ſuo A B, ad diſtantiam 6 pollicum ponebatur Magnes
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C, â quo dirigebatur in ſitum a b, tum loco vaſis D lata </
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