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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<
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xml:space
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">De Directione Magnetis & Ferri ſuper ipſo
<
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ducti.</
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<
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<
s
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xml:space
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">Donatus eſt Magnes plerumque duobus polis, qui ſunt plagæ
<
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alicujus latitudinis, non puncta Mathematica, inſtar polo-
<
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rum terreſtrium, aut coeleſtium: </
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>
<
s
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xml:space
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">Supra memoravimus vim attrahen-
<
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tem Magnetis maximam ab hiſce polis exerceri; </
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>
<
s
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xml:space
="
preserve
">qui ideo facile de-
<
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teguntur, circumquaque circa Magnetem Ferrum applicando, & </
s
>
<
s
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<
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explorando quibuſnam in locis id fortiſſime attrahatur: </
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>
<
s
xml:id
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xml:space
="
preserve
">Innoteſcunt
<
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tamen facilius ope Scobis ferreæ circumſperſæ, vel Acum nauti-
<
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cam ſupra Stylum mobilem circumducendo, quæ maximo cum
<
lb
/>
impetu verſus hos polos dirigetur.</
s
>
<
s
xml:id
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</
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<
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<
s
xml:id
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xml:space
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">Sunt aliquando bini poli ſibi in recta diametraliter oppoſiti, ali-
<
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quando in curva: </
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<
s
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xml:space
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">Non quoque in omnibus Magnetibus neceſſario
<
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duo tantum poli deprehenduntur, quippe & </
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>
<
s
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xml:space
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">ipſe vidi, atque alii nota-
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verunt Auctores, Magnetes, in quibus tres, idem teſtante Fournierio,
<
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tum in quibus quatuor manifeſto poli obſervabantur: </
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<
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<
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">Pugettus
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in Tractatu Experimentorum Magneticorum Sermone Gallico con-
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ſcriptorum, Magnetis meminit, vide Tab. </
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<
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">7. </
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">1. </
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<
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">Sphærici
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A B C D, pedi eburneo inſiſtentis, a cujus polo A, Acus nauticæ cuſpis
<
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attrahitur, quæ a parte, priori oppoſita, C, etiam allicitur, indi-
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cio A & </
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<
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xml:space
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">C eſſe polos cognomines: </
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<
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xml:space
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">a parte B attrahitur ejuſdem A-
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cus cauda, quam pariter allicit oppoſitum punctum D: </
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<
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xml:space
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">poſſidet A-
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cuum nauticarum artifex inſignis Rotterodamenſis, Dykgraaf, Ma-
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gnetem, quem mihi explorandum accommodavit, formæ utcun-
<
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que cubicæ, quam repræſentat Tab. </
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<
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">7. </
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<
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<
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xml:space
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">in cujus latere ante-
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riori N, Z, ſunt duo poli, quorum unus N eſt Boreus, alter Z Au-
<
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ſtralis, latus N Z priori oppoſitum, etiam duos habet polos, quo-
<
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rum hic N eſt Boreus, alter Z Auſtralis: </
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<
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xml:space
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">penes eundem artificem
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alius proſtat Magnes formæ oblongæ, Tab. </
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<
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">7. </
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<
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">3. </
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<
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xml:space
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">in quo pri-
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mum tres obſervabantur poli, unus B Boreus, erant M, M. </
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<
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xml:space
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">duo Meri-
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dionales, Magnete autem diviſo ſectione F K, fragmentum A </
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