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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120106DISSERTATIO circo vis Magnetis non tanta cum efficaciâ in Ferrum rubiginoſum
agit quam in purum: quamobrem nequaquam conſentio cum Ta-
chenio in Clave Hippocr. Medic. Cap. 9. hoc explicante, quod ex
rubigine acidum ferri exſpiravit, & ob id ejus odorem mater (Ma-
gnes ſcilicet) non percipit.

EXPERIMENTUM XL.

Magnes inermis, qui poteſt elevare maſſam ferream duarum un-
ciarum, quod eſt maximum pondus ab eo ſuſtinendum; non pote-
rit tamen elevare aliud Ferrum unciæ unius cum uncia alterius me-
talli, etiamſi ſuperficiem ſimilem priori maſſæ habuerit: quemad-
modum recte obſervavit Dechales.

EXPERIMENTUM. XLI.

Magnes in aliquot partes ope ſerræ dividatur, ne concuſſione in-
teriora ejus turbentur, tum ſumma ponderum Ferri, quam omnia fra-
gmenta ſeorſim examinata ſuſtinent, multum ſuperat illud pondus,
quod antea â Magnete integro elevabatur.

Raro grandis datur Magnes, qui ſuum geſtare poteſt pondus: mi-
nores novi plurimos, qui vim attrahentem decies, vigeſies & ultra
ſuperantem ſuum pondus poſſident; minimos vidi, quorum virtus
quingenties gravitatem excedebat: Quia autem grandis Magnes con-
ſiderari poteſt inſtar congeriei plurimorum parvorum, in unam con-
junctorum maſſam, hi ſibi additi nequeunt tantam vim in Ferrum
exercere, quam ſeparati: Demonſtratum enim eſt in Experimento
XVI. Vim Magnetis in Ferrum decreſcere, prout majori ab eo ab-
eſt diſtantia: Sit Magnes A Tab. 2. fig. 3. qui attollere poſſit Fer-
rum B, concipiatur diviſus in 9 partes, quas figura exhibet, appa-
rebit intuenti, Ferrum B eſſe quidem immediate applicatum parti-
bus 1, 2, 3. Sed diſtare a partibus 4, 5, 6 craſſitie partium in ſe-
rie anteriori, quamobrem hæ agent modo in Ferrum, quemadmo-
dum Magnes in id, tantopere a ſe remotum, operatus fuiſſet: Quia
autem partes 7, 8, 9. multo plus diſtant â Ferro B, quam ſeries
media, iterum minus in illud operabuntur; adjuvabunt tamen

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