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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<
s
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">Si Virga pro hiſce Experimentis quædam longior eligatur, ejus
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punctum attrahens polum Boreum Verſorii ſemper plus diſtat abex-
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tremitate Ferri, quam punctum, quod polum Auſtralem Acus affi-
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cit, quemadmodum olim in Philoſ. </
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fuit, & </
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<
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<
s
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xml:space
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">Eſt profecto admirandum, Ferrum candens, ſed perpendiculari-
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ter ad horizontem poſitum, vi imbui Magneticâ, cum Magnes ipſe
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candefactus, & </
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<
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dum nihil virtutis retineat, aut acquirat: </
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<
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Magnetes oblongos, in Igne canderactos, refrigerio expoſuit, aut
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eos dirigendo verſus Boream & </
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do, vel perpendiculariter, vel in quocunque alio obliquo ſitu, ve-
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rum nunquam vim attractricem aut directricem in iis ſuperſtitem ob.
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<
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<
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<
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bus iisdem Virgæ ferreæ, perpendiculariter ad horizontem deten-
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tæ & </
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<
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">ipſi oppoſitæ, in diverſis locis Terræ.</
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<
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loſophicis Tranſactionibus N°. </
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judicavi, cum hactenus neminem offendi, qui ſimiles inſtituit: </
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ſcriptæ autem fuerunt Anno 1684. </
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gante.</
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<
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pars Borea attrahebat extremitatem Virgæ ferreæ ſuperiorem; </
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ſorii pars Auſtralis, attrahebat Virgæ inferius extremum.</
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verſus Occaſum, extremum Verſorii Auſtralem fortiter attrahebat
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Virgæ infimum: </
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attrahebat partem ſuperiorem virgæ, quam ſupra.</
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Lizard, verſus Occaſum, Verſorii pars Borea incipiebat declinare
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a parte ſuprema Virgæ, & </
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verſus partem infimam Virgæ.</
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