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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118104DISSERTATIO minus Ferri elevabit, gaudens tantum virtute, quam cum eo debi-
lior Magnes communicaſſet.

EXPERIMENTUM XXXVII.

Si lamina ferrea, ſuper alterutro Magnetis polo ducta ſiniſtror-
ſum, vi attractrice imbuta fuerit, deinde reducatur dextrorſum,
maximam virtutis partem, quam in priori tractu acquiſivit, amittet,
ea quæ ſupereſt hæret in laminæ extremitate, quæ ultimo Magne-
tem attigit.

Nunquam igitur Ferrum Magneti affricandum eſt, illud ducendo
dextrorſum, & reducendo ſiniſtrorſum, nam poſt plurimos ejuſ-
modi itus redituſque Ferrum nihil virtutis accipiet: hoc recte quon-
dam obſervavit Barlow, & Riccioli in Geograpb. pag, 338. Ani-
madvertit præterea Eruditiſſimus Derhamus, Ferrum ita affrictum
non in ſuis extremitatibus habere polos, ſed in centro, vel prope
illud: aliquando unum polum eſſe prope centrum, alterum ad alte-
rutrum extremum: aliquando ambo extrema attrahi ab eodem polo
Magnetis, ab altero ejus polo repelli: in quo caſu polus repellens
ſemper inveniebat partem attrahentem prope centrum: In aliis ob-
ſervavit ferramentis, vim directricem eſſe converſam, eorumque
extrema attrahi & repelli plane contrario modo quam naturaliter ſo-
let. Confer. Philoſ. Tranſ. N°. 303.

EXPERIMENTUM XXXVIII.

Viribus alicujus Magnetis in Ferrum, datâ diſtantiâ remotum,
ſecundum noſtram ponderandi methodum accuratiſſime cognitis, la-
pidi affricentur plurima corpora ferrea, quæ vi Magnetica impræ-
gnentur; tum ſtatim exploretur vis denuo Magnetis in Ferrum; an
permanſerit, utrum decreverit: obſervabitur perpetuo perſeveraſſe
ſine ullo decremento,

Plures hanc obſervationem memoriæ prodiderunt, uti Norman-
nus in New. attract. Cap. 1. Gilbertus, & Hartſoekerus tandem,
qui mihi ſuum nonnunquam teſtatus dolorem, ſe ex Jobloti aſler-
tis in errorem illapſum, contrarium ſuis inſeruiſſe ſcriptis,

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