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.
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<
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">Extremitas fili ferrei apponatur polo Magnetis, non affricando
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id, ſed tantum applicando & </
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<
s
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xml:space
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">avellendo Magnetem, filum oſtendet
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per totam longitudinem puncta Magnetica polaria in diverſis locis,
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quæ vocantur Puncta Conſequentia, quia attrahunt alternatim po-
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lum Boreum & </
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<
s
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xml:space
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">Auſtralem Verſorii, cujus apex lente ſecundum lon-
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gitudinem fili promovetur ad diſtantiam {1/2} pollicis.</
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<
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<
s
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">Verſorium novum, modo ante igni commiſſum, & </
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<
s
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xml:space
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">nondum vi-
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ribus Magneticis imprægnatum, 12 {1/2} pollices longum, erat mihi ad
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manus, quod loco fili vel virgæ ferreæ ſumſi; </
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<
s
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xml:space
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">id ſupra pin-
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nam mobiliſſimum, a viribus Magneticis exiguis e quiete
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turbabatur: </
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<
s
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xml:space
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">Secundum hujus longitudinem tenui duxique apicem
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Verſorii Boreum, quod Magneti affrictum fuit, tumque 6 Puncta
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Conſequentia obſervabantur: </
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<
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xml:space
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">apex novi Verſorii attrahebatur, locus
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1 {1/2} pollice inde diſtans repellebatur, eratque quidem 6 pollices la-
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tus; </
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<
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">tum iterum dabatur locus attrahens, tum iterum repellens, at-
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trahebatur plage ſequens, repellebatur tandem altera extremitas:
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</
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<
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xml:space
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">ſed apice Auſtrali ducto ſecundum longitudinem Verſorii novi, ob-
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ſervabantur modo tria Puncta Conſequentia, atque in aliis locis
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quam in quibus antea Puncta conſequentia animadverteram; </
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<
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mitas enim novi Verſorii repellebatur, quæ repulſio per 1 {1/2} pollicem
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durabat, tum ſequebatur attractio exigua; </
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<
s
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">ſed ad finem fere perdu-
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rans, tum fortiſſima attractio a priori diſtincta: </
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<
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xml:space
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">quæ omnia longe
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clarius conſpiciebantur, poſtquam Apex novi Verſorii polo Magnetis
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femel applicatus fuerat.</
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<
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</
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<
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">Primi hoc Experimentum deſcripſerunt Cl. </
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">Diſaguillierius & </
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">368, hic 5 Acus Chalybeas, 2 polliceslon-
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gas, quarum extremitates Magneti antea applicatæ fuerant, impoſuit. </
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Aquæ ſtagnanti, atque Verſorii cuſpidem ſecundum harum lon-
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gitudinem promovit, ita tamen ut eas non attingeret, tum â pun-
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ctis notatis in Tab. </
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<
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vel Septentrionalis, prout litteræ A & </
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<
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obſervabantur 5 poli, quemadmodum quoque in ſecunda, inter
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quas intercedit differentia hæc tantum; </
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<
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attrahant polum Septentrionalem. </
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7, in quinta 4.</
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