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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tiocinium ex una alterave obſervatione deducens non poteſt non ſæ-
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piſſime illabi in errores: </
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<
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">Anno 1725. </
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<
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">lamella valde ignita, ſuper
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polo egregii Magnetis ducta, & </
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<
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">immiſſa limaturæ Ferri, nullum
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indicium virium attractricium edidit, repetitus fuit ad Magnetem
<
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affrictus, cum Ferro nulla vis communicata fuit, refrigerata lamella
<
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non majorem virtutem attrahendi habuit, quam quælibet alia lamella
<
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poſſidere ſolet. </
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<
s
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xml:space
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">Anno 1727 cum alio præſtanti Magnete, ſed ar-
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mato, idem Experimentum coram plurimis repetii ſpectatoribus,
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eadem lamella ferrea, vehementer ignita, ſuper pede ſive polo ar-
<
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mati Magnetis ducta fuit, tum ſcobi immiſſa, oſtendit inſignem vim,
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ſcobe undiquaque inſtar barbæ ſibi adhærente, frigefacta eandem vim
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retinuit. </
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<
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xml:space
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">Admiratus eventum inſperatum & </
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<
s
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">priori oppoſitum, ſe-
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quenti die tentamen repetii cum filo ferreo, novam capiendo ſco-
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bem, & </
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>
<
s
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="
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xml:space
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">caute ad omnia attendens, ne ſeducerer, ſed fuit idem ten-
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taminis ſucceſſus, vi Magnetica imprægnatum fuit filum ignitum,
<
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eandem retinuit refrigerio commiſſum. </
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<
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xml:space
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">Quid ex tam oppoſito eventu
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concludi poteſt? </
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<
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xml:space
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">an non, Magnetes nonnullos vim cum Ferro poſſe
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communicare ignito, alios non poſſe: </
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<
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">aut hoc tempore phænomenon
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a Magnete excitari, quodalia tempeſtate non excitatur: </
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<
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xml:space
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">an vero arma-
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tura aliquid contribuit? </
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<
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">an pendet â certo gradu candefactionis? </
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">an
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â Ferro? </
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<
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xml:space
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">Sed præſtat ſobrie ex ejuſmodi ratiocinari Experimentis.</
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">Magnes poſitus fuit in tabula rotatili, in altera tabula Verſorium,
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quod diſtabat a Magnete 10 pedibus, ita ut axis Lapidis & </
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ſentin eodem plano horizontali; </
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">Verſorio ad quietem reducto, conver-
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ſa fuit Tabula cum Magnete, motus Verſorii obſervatus fuit, ante-
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quam tamen moveri incipiebat, tempus interceſſit, brevius minuto
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ſecundo; </
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<
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xml:space
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">propius deinde admotus fuit Magnes Verſorio, illiuſque
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tabulâ ſeptem pedibus diſtante, rurſuſque converſâ, Verſorium motum
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fuit, brevius tamen tempus inter initium motus Magnetis & </
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ſorii interceſſit, quam antea: </
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<
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">iterum propius Magnes admotus Ver-
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ſorio fuit, intervallo 3 pedum inter utrumque intercedente; </
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verſo Magnete ſimul converſum fuit Verſorium, neque temporis
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mora obſervari potuit: </
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