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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122108DISSERTATIO

EXPERIMENTUM XLIII.

Poſſunt fragmenta Magnetum varia conjungi in unam maſſam,
quæ multas vires exercebit, modo inter & circum partes fundatur
plumbum: ſunt fragmenta hoc ordine locanda, ut Poli ejuſdem
nominis ſpectent eandem partem: tum enim diſpoſita ſunt,
quemadmodum a Natura partes locatæ fuiſſent magni Ma-
gnetis, ars hic imitata Naturam e parvis componit majorem molem:
Dechales aliique plurimi hoc noverunt & experientia comproba-
runt.

EXPERIMENTUM XLIV.

Nonnunquam contingit, ut grandis Magnetica moles non oſten-
dat multum virium attrahentium, cum eadem in fragmenta plurima
diſſecta, aliquam exiguam portionem exhibeat magnis viribus do-
natam, a qua, in medio Lapide, tanquam a corde molis, vis omnis
pependit, quæ diſperſa per totam majorem maſſam, aut egredi
impediebatur, vel quaquaverſum per totam molem diſtributa de-
bilitabat loca polaria.

EXPERIMENTUM. XLV.

Tab. 2. fig. 4. Supra Magnetem generoſum & grandem A, ad
notabilem ab ipſo diſtantiam teneantur duæ claves ferreæ B, C,
nunquam antea vi Magnetica imprægnatæ, ex clave C ſuſpendetur
B K, imo hæ ambæ nonnunquam feruntur a tertia clavi D: ſi ad
majorem diſtantiam a Magnete attollatur D, ſimul cum adhærentibus
ſibi clavibus C, B, tum ſolutæ a ſe mutuo decidunt: Ad magnam
autem diſtantiam a Magnete removeri claves poſſunt, antequam
ſolvantur, quippe obſervavit Derhamus in Philoſ. Tranſact. N°.
303. Magnetem Societatis Regiæ Brittannicæ ſuſpendiſſe claves duas
ex ſe mutuo ad intervallum 8, 9, vel 10 pedum ab ipſo Ma-
gnete.

Obſervamus in hoc Experimento vim Magnetis attractricem

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