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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feriorem partem fortiter appetiiſſe Verſorii cuſpidem Boream: </
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vis hæc fortior adhucdum obſervata fuiſſet, modo Experimentum
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captum fuiſſet in majori latitudine Auſtrali, 35° grad. </
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dine eadem, ſub qua Madagaſcar jacet.</
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">Virga ferrea ita impoſita fuit Incudi, ut ſitum Meridiano terreſtri
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parallelum habuerit; </
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<
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">ejus extremum, Boream reſpiciens, malleo
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tuſum, evaſit polus Boreus, extremum Auſtrale malleo ictum fa-
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ctum eſt polus Auſtralis: </
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<
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">Succedit autem hoc Experimentum cum
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virgis certæ longitudinis & </
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<
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">craſſitiei, non cum omnibus; </
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<
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nimium craſſa reſpectu ſuæ longitudinis fuerit virga, licet alteru-
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trum extremum Malleo cudatur, vis polorum directrix obſervabi-
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tur nulla, niſi extremum tantopere attenuetur, ut virgæ ſubtilitas
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certam proportionem ad ſuam longitudinem recipiat. </
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<
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">Quæcunque
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de effectu Mallei dicta ſunt, etiam intelligenda ſunt de lima ſuper
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Ferro ducta, de Ferri attritu ſupra quodcunque durum corpus, de
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ſectione ope ſerræ, modo Ferrum ſit longum & </
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<
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">Quo au-
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tem memorata inſtrumenta vi fortiori in Ferrum adiguntur, eo Ma-
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gnetiſmus illi major inducitur, qui tamen nunquam eo uſque in-
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creſcit, qualis a Magnete, etiamſi mediocrium virium, cum Fer-
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ro communicari poteſt. </
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">Ut cudendo virgam ſupra incudem, extre-
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mo alterutri polum Boreum inducamus alteri Auſtralem hac in re-
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gione, viam ſequi oportet, quam Acus Inclinatoria præmonſtrat:
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</
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">Ferri pars Auſtralis ſit ſupra incudem multo elevatior, pars Borea
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depreſſior, hoc modo cuſa virga, ſemper binos polos in ſuis extre-
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mitatibus habebit: </
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">ſed ſi Ferrum alio ſupra incudem tenueris modo,
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aliquando in utroque extremo polum Boreum obſervabis; </
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plura ſcripta video in Philoſ. </
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neat, capiatur; </
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ſum, donec poſt multas flexiones frangatur; </
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