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
              <lb/>
            H in ipſam ageret Libram GX, quæ ex Chalybe eſt compoſita; </s>
            <s xml:id="echoid-s447" xml:space="preserve">ex
              <lb/>
            altero extremo Libræ X pendebat Lanx cuprea F, pondera excipi-
              <lb/>
            ens, quæ gravitate ſua menſurabant vires Magnetum Attractrices.</s>
            <s xml:id="echoid-s448" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s449" xml:space="preserve">Quoniam ad varias diſtantias Magnetum a ſe mutuo vires erant ex-
              <lb/>
            plorandæ, oportebat ut Libra attolli deprimive poſſet, & </s>
            <s xml:id="echoid-s450" xml:space="preserve">ut Mag-
              <lb/>
            nes ex ea ſuſpenſus ſemper eidem puncto alterius fixi Magnetis res-
              <lb/>
            ponderet, ita attollenda erat Bilanx, ut in eadem linea, ad hori-
              <lb/>
            zontem perpendiculari ſemper foret: </s>
            <s xml:id="echoid-s451" xml:space="preserve">quamobrem ejus uncum ſupe-
              <lb/>
            riorem Q immiſi crenæ parallelepipedi lignei QB, eique ope clavi E
              <lb/>
            affixi: </s>
            <s xml:id="echoid-s452" xml:space="preserve">transmittebatur parallelepipedum QB per foramen quadratum
              <lb/>
            Z, aſſeri DC inſculptum, qui parieti immobilis inhærebat, adeout cum
              <lb/>
            Ligno BQ Libra nunc attolli deprimique potuerit, quemadmodum de-
              <lb/>
            ſiderabatur, quod ut facillime fieret, ei annexus fuit funis B d c e M,
              <lb/>
            ſupra Cochleam A transmiſſus: </s>
            <s xml:id="echoid-s453" xml:space="preserve">ſi ex ſolo fune pependiſſet Libra,
              <lb/>
            perpetuo intorta fuiſſet, fune ſe convolvente aut evolvente ſemper
              <lb/>
            pro varia aeris ſiccitate, unde absque apparatu modo ante deſcripto
              <lb/>
            nihil obſervari poterat: </s>
            <s xml:id="echoid-s454" xml:space="preserve">Alter Magnes, in quem operari debebat
              <lb/>
            prior H, erat quoque Terrella NO, inſiſtens rotundo aſſeri, qui in
              <lb/>
            medio excavatus erat, ut eo facilius Magnes NO poneretur in ſitu
              <lb/>
            quolibetcunque; </s>
            <s xml:id="echoid-s455" xml:space="preserve">aſſer tripes inſiſtebat Menſæ firmæ ligneæ TT, quæ
              <lb/>
            nullos clavosferreos, nihilque ferri continebat, ne mutua in ſe Ma-
              <lb/>
            gnetum actio turbaretur.</s>
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          </p>
          <p>
            <s xml:id="echoid-s457" xml:space="preserve">Hoc apparatu præmiſſo, pondus Magnetis H, funisque GH ex-
              <lb/>
            ploravi, ſublato Magnete altero N O a Tabula: </s>
            <s xml:id="echoid-s458" xml:space="preserve">deinde ex unco G
              <lb/>
            demiſi pendulum aliquod ex tenui filo, ut notaretur locus huic ex-
              <lb/>
            tremitati Libræ G ſubjectus; </s>
            <s xml:id="echoid-s459" xml:space="preserve">in quo Magnetis ON polum locavi;
              <lb/>
            </s>
            <s xml:id="echoid-s460" xml:space="preserve">converti tum ambos Magnetes, ut eorum axes, ſive Lineæ per polos
              <lb/>
            tranſeuntes, eſſent perpendiculariter ad horizontem erecti, atque in
              <lb/>
            una eademque linea producta: </s>
            <s xml:id="echoid-s461" xml:space="preserve">Polus Magnetis Hinferior attrahebat
              <lb/>
            acus Magneticæ polum auſtralem, ſed polus Magnetis N ſurſum
              <lb/>
            ſpectans, ejusdem acus polum Borealem alliciebat, quamobrem bini
              <lb/>
            poli Magnetum, ſibi amici, nunc ſe reſpiciebant: </s>
            <s xml:id="echoid-s462" xml:space="preserve">Experimenta in-
              <lb/>
            choaturus, attollebam prius Magnetem H ad magnam ab inferiori N
              <lb/>
            intercapedinem; </s>
            <s xml:id="echoid-s463" xml:space="preserve">& </s>
            <s xml:id="echoid-s464" xml:space="preserve">cum pondere lanci F immiſſo redegi in æquili-
              <lb/>
            brium; </s>
            <s xml:id="echoid-s465" xml:space="preserve">deinde paulatim relaxato fune M e c d B ad minores </s>
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