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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5945DE MAGNETE. tactu attrahebatur vi = 574 granis. Ut hanc ſequelam magis confir-
mare poſſem, ſuſpendi ex bilance ferrum adhuc multo minus, nempe
pedem chaly beum pyramidalem circini vulgaris, cujus cuſpis acuta in
immediato contactu ad Magnetis ejuſdem rotundi polum attrahebatur
vi = 20. granis. tum con vertebam hunc pedem chalybeum, ut parte
obtuſiori eundem Magnetis polum contingeret, nuncattrahebatur viri-
bus 224 granorum, adcoque multo minus quam ullum ferrum in Expe-
rimentis XVII, XVIII, XIX. XX. Sed hanc ſequelam ulterius confir-
mant Experimenta duo cum limatura ferri inſtituta, uti Experimenta.
XXI & XXII. nam limaturæ quantitas major attrahebatur in contactu
vi 650. granor. & quantitas minor vi 710. granor. verum quantitas li-
maturæ relicta in eadem capſula multo minor, attrahebatur 315. gra-
nis, adcoque manifeſtum eſt, dari determinatam magnitudinem ferri,
in quam Magnes fortiſſime agit, & ipſum in majorem vel minorem
ferri molem minoribus viribus tantum operari.

Ex hiſce Experimentis opinor poſſe elici methodum optimam ar-
mandi Magnetem, ut ferri maximum elevet onus, ſi ponderando
inquireremus, in quam craſſam ferri molem viribus ageret ſummis;
ſique tum armatura fabrefieret ex inventa craſſitie. Ex hoc Co-
rollario etiam fluit Magnetem non attrahere Ferrum vi Legis gene-
ralis Attractionis, qua omnia corpora ſeſe trahunt; nam ponamus
particulis ferri æqualibus innatam eſſe eandem vim attrahendi Ma-
gnetem, tum erit magnitudo attractionis in maſſa ferrea, uti eſt
magnitudo maſſæ, & idcirco maſſa major â Magnete fortius de-
beret attrahi, quam minor; verum longe quid aliud experientia e-
vincit, & maſſa major debilius attrahitur minori, quamobrem Ma-
gnetis actio ab alia cauſa, quam â Lege Univerſali attractionis pen-
debit, quod infra prolixius evincere conabor aliis adhuc argumentis.

Corol. 3. Non tamen ad eandem a ſe mutuo diſtantiam agit
Magnes in ferrum quam quidem agunt duo Magnetes in ſe invicem.
Intueamur enim Experimentum 1 in quo Magnes rotundus major ope-
rabatur in minorem ad diſtantiam 5. poll. 10. linear. in Experimen-
to II. ad diſtantiam 9. pollic. in Experimento III. ad diſtantiam 12.
pollic in Experimento V. ad diſtantiam 18 pollic. ſed in Experimen-
to XVIII. idem Magnes modo agebat in ferrum ad diſtantiam 3.
pollic 10. linear. uti & in Experimento XIX. & XX. ad 4.

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