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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tum dextrorſum, ſupra eundem polum Magnetis, eadem omnino
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phænomena tam quoad directionem, quam Puncta Conſequentia,
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obſervantur, quæ in Experimento præcedenti.</
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">Omni vi Magnetica in igne ex Verſorio præcedentium Experi-
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mentorum expulſa, nihilominus id inter refrigerandum vim directri-
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cem acquiſiverat, quâ cuſpide dirigebatur Boream verſus, cauda
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Auſtrum verſus, uti fuſius in Cap. </
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<
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">nunc autem Verſo-
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rium modo in extremitate polarem vim oſtendebat, ipſi admoto altero
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Verſorio, ſed nulla Puncta Conſequentia in intermedia parte: </
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<
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">cu-
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ſpide Verſorii Borea applicata polo Magnetis Auſtrali, affricabatur
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hoc a cuſpide medium verſus, ducta tamen modo ſupra Ma-
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gnetem ad {1/4} totius ſuæ longitudinis partem: </
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<
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">ubi avulſum fuit â la-
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pide, cuſpis Borea manſit Borea, torpida tamen in ipſâ regnante vi
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directrice; </
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<
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">ſed accurate ad Meridianum reducente Acum: </
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">Alterius
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Verſorii cuſpis Borea, retenta prope cuſpidem Boream hujus, attrahe-
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bat polum Boreum: </
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">attamen in diſtantia 1 {1/2} pollicum ab extremo regna-
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bat vis repellens, tum iterum vis attrahens dabatur uſque ad cuſpidem
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Auſtralem, adeo ut ambo extrema Verſorii attracta fuerint a cuſpi-
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de Borea alterius Verſorii.</
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">Tum affrictus Verſorii productus fuit ab extremo Boreo uſque
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ad medium, vel centrum, ſuper eodem polo Magnetis, Verſorium
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ſtylo impoſitum convertebatur, parte nempe Auſtrali directa Bo-
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ream verſus, & </
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">Borea Auſtrum verſus, utraque extremitas attra-
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hebatur ab alterius Verſorii cuſpide Borea prope illas poſita, nam
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ab uno extremo ad longitudinem 4 pollicum circiter fiebat attractio,
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ad longitudinem 4 pollicum abhinc adeoque ultra centrum Verſorii,
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exercebatur repulſio, abhincuſque ad oppoſitum extremum regnabat
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iterum vis attrahens: </
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">ſed alterius Verſorii cuſpis, polo Auſtrali ſpectan-
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te Verſorii, quod examinatur, cuſpidem Boream, hanc Boream repelle-
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bat, regnante repulſione ad diſtantiam 4 pollicum ab apice, hinc uſque
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ad medium erat indifferentia, ſive nec attractio, nec repulſio; </
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dio apicem oppoſitum verſus in longitudine 2 pollicum exercebatur
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attractio, hinc uſque ad extremum iterum repulſio dabatur. </
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