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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lant Philoſophi, poſtulabatur autem funis tam longus, ne Magnes
<
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H in ipſam ageret Libram GX, quæ ex Chalybe eſt compoſita; </
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altero extremo Libræ X pendebat Lanx cuprea F, pondera excipi-
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ens, quæ gravitate ſua menſurabant vires Magnetum Attractrices.</
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<
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plorandæ, oportebat ut Libra attolli deprimive poſſet, & </
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nes ex ea ſuſpenſus ſemper eidem puncto alterius fixi Magnetis res-
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ponderet, ita attollenda erat Bilanx, ut in eadem linea, ad hori-
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zontem perpendiculari ſemper foret: </
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<
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riorem Q immiſi crenæ parallelepipedi lignei QB, eique ope clavi E
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affixi: </
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<
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xml:space
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">transmittebatur parallelepipedum QB per foramen quadratum
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Z, aſſeri DC inſculptum, qui parieti immobilis inhærebat, adeout cum
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Ligno BQ Libra nunc attolli deprimique potuerit, quemadmodum de-
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ſiderabatur, quod ut facillime fieret, ei annexus fuit funis B d c e M,
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ſupra Cochleam A transmiſſus: </
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perpetuo intorta fuiſſet, fune ſe convolvente aut evolvente ſemper
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pro varia aeris ſiccitate, unde absque apparatu modo ante deſcripto
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nihil obſervari poterat: </
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xml:space
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prior H, erat quoque Terrella NO, inſiſtens rotundo aſſeri, qui in
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medio excavatus erat, ut eo facilius Magnes NO poneretur in ſitu
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quolibetcunque; </
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nullos clavosferreos, nihilque ferri continebat, ne mutua in ſe Ma-
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gnetum actio turbaretur.</
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<
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xml:space
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">Hoc apparatu præmiſſo, pondus Magnetis H, funisque GH ex-
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ploravi, ſublato Magnete altero N O a Tabula: </
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<
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demiſi pendulum aliquod ex tenui filo, ut notaretur locus huic ex-
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tremitati Libræ G ſubjectus; </
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<
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tranſeuntes, eſſent perpendiculariter ad horizontem erecti, atque in
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una eademque linea producta: </
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acus Magneticæ polum auſtralem, ſed polus Magnetis N ſurſum
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ſpectans, ejusdem acus polum Borealem alliciebat, quamobrem bini
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poli Magnetum, ſibi amici, nunc ſe reſpiciebant: </
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choaturus, attollebam prius Magnetem H ad magnam ab inferiori N
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intercapedinem; </
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brium; </
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