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.
"/>
tactu attrahebatur vi = 574 granis. </
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<
s
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xml:space
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">Ut hanc ſequelam magis confir-
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mare poſſem, ſuſpendi ex bilance ferrum adhuc multo minus, nempe
<
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pedem chaly beum pyramidalem circini vulgaris, cujus cuſpis acuta in
<
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immediato contactu ad Magnetis ejuſdem rotundi polum attrahebatur
<
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vi = 20. </
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<
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">granis. </
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<
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xml:space
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">tum con vertebam hunc pedem chalybeum, ut parte
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obtuſiori eundem Magnetis polum contingeret, nuncattrahebatur viri-
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bus 224 granorum, adcoque multo minus quam ullum ferrum in Expe-
<
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rimentis XVII, XVIII, XIX. </
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<
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xml:space
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">XX. </
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<
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xml:space
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">Sed hanc ſequelam ulterius confir-
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mant Experimenta duo cum limatura ferri inſtituta, uti Experimenta.
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</
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<
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<
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<
s
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xml:space
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">nam limaturæ quantitas major attrahebatur in contactu
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vi 650. </
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<
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xml:space
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">granor. </
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<
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xml:space
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">& </
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<
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xml:space
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">quantitas minor vi 710. </
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<
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<
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xml:space
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">verum quantitas li-
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maturæ relicta in eadem capſula multo minor, attrahebatur 315. </
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<
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xml:space
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nis, adcoque manifeſtum eſt, dari determinatam magnitudinem ferri,
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in quam Magnes fortiſſime agit, & </
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<
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xml:space
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">ipſum in majorem vel minorem
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ferri molem minoribus viribus tantum operari.</
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</
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<
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<
s
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xml:space
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">Ex hiſce Experimentis opinor poſſe elici methodum optimam ar-
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mandi Magnetem, ut ferri maximum elevet onus, ſi ponderando
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inquireremus, in quam craſſam ferri molem viribus ageret ſummis;
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</
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<
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xml:space
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">ſique tum armatura fabrefieret ex inventa craſſitie. </
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<
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xml:space
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">Ex hoc Co-
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rollario etiam fluit Magnetem non attrahere Ferrum vi Legis gene-
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ralis Attractionis, qua omnia corpora ſeſe trahunt; </
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<
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xml:space
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">nam ponamus
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particulis ferri æqualibus innatam eſſe eandem vim attrahendi Ma-
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gnetem, tum erit magnitudo attractionis in maſſa ferrea, uti eſt
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magnitudo maſſæ, & </
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<
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">idcirco maſſa major â Magnete fortius de-
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beret attrahi, quam minor; </
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<
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vincit, & </
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<
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xml:space
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">maſſa major debilius attrahitur minori, quamobrem Ma-
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gnetis actio ab alia cauſa, quam â Lege Univerſali attractionis pen-
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debit, quod infra prolixius evincere conabor aliis adhuc argumentis.</
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<
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Magnes in ferrum quam quidem agunt duo Magnetes in ſe invicem.
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</
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<
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rabatur in minorem ad diſtantiam 5. </
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to II. </
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pollic in Experimento V. </
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<
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to XVIII. </
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<
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pollic 10. </
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<
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