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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virtute actionem ſeriei primæ in Ferrum: </
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xml:space
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paratæ fuiſſent, atque ſingulis Ferrum immediate apponeretur, id
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ſingulas contingens ſumma vi attractum fuiſſet, unde ſumma pon-
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derum ab his 9 attractorum multum ſuperaret pondus ab unitâ maſ-
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ſâ A geſtatum: </
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<
s
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xml:space
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">quo A in minores partes erit diviſum, quibus ſin-
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gulis Ferrum geſtandum traditur, eo plus ponderis elevabitur ab omni-
<
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bus ſimul: </
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<
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xml:space
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">quo autem A grandior moles exiſtit, eo partes poſterio-
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res magis diſtant ab iis, quibus Ferrum applicatur, & </
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<
s
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xml:space
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nus in id operari poſſunt.</
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<
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head
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<
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xml:space
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">Quo Magnetes ſunt majores, licet non fuerint eximiæ virtutis,
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eo ad majorem diſtantiam vires ſuas diffundunt: </
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<
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xml:space
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">Quare præſtantes,
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ſed parvi Magnetes non tam late ſuam vim exſerunt, quam magni,
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licet inertiores; </
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<
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xml:space
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">quod etiam experientia ſe didiciſſe confirmat Hart-
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ſoekerus, ideo tres quatuorve Magnetes bene ſecum invicem jun-
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cti ad majorem diſtantiam agunt, quam ſinguli ſeorſim.</
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<
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</
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<
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<
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xml:space
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">Ad magnum ſæpe intervallum a lapide vis attractrix diffunditur;
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</
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<
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xml:space
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">Experimenta nonnulla feci cum aliquo grandiori, qui manifeſto o-
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perabatur in diſtantia 14 pedum Rhenolandicorum. </
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<
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xml:id
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xml:space
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">Optime cogno-
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ſcetur ad quodnam intervallum vis ex Magnete extendatur duobus
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ſequentibus modis. </
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<
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">1°. </
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<
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xml:space
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">Acus Chalybea tenuiſſima imponatur ſuperfi-
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ciei Aquæ, ut natet in medio, tum in magna diſtantia poſitus Magnes
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primum ſit, qui admoveatur ſenſim, & </
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<
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">ita ut linea tranſiens perpolos
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Acum verſus dirigatur, appropinquet Magnes eousque, donec Acus
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moveri incipiat, quæ tandem adnatabit parieti vaſis Magnetem ſpe-
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ctanti. </
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<
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<
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xml:space
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">Vel Verſorium mobiliſſimum, 6 pollices plureſvelon-
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gum in Meridiano ſuo locetur, notato gradu cui cuſpis reſpondet,
<
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tum Magnes ex longo intervallo ſenſim admoveatur, ita ut axis ſit
<
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ad Acum perpendicularis in eodem horizontali plano, donec a ſitu
<
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incipiat Verſorium detorqueri; </
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<
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xml:space
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">hæc diſtantia erit longitudo virium
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Magneticarum, ſive radii activi; </
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<
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que fecit Fontenellius in L’Hiſtoire de L’Acad. </
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