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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            <s xml:id="echoid-s423" xml:space="preserve">
              <pb o="13" file="0027" n="27" rhead="DEMAGNETE."/>
            quomodo ad ſe appropinquent, an cum iisdem, an cum diverſis viribus
              <lb/>
            in variis diſtantiis? </s>
            <s xml:id="echoid-s424" xml:space="preserve">tum quænam proportio virium in dato intervallo
              <lb/>
            obtineret? </s>
            <s xml:id="echoid-s425" xml:space="preserve">deinde quærenda erat cauſa, quæ moveret pelleretve ver-
              <lb/>
            ſus ſe mutuo Magnetes in proportione diſtantiarum obſervata: </s>
            <s xml:id="echoid-s426" xml:space="preserve">ho-
              <lb/>
            rum enim cognitionem deſiderant Philoſophi, ut intelligant evidenter,
              <lb/>
            quid ſit Magnes, & </s>
            <s xml:id="echoid-s427" xml:space="preserve">quomodo intima hujus Lapidis natura ſit comparata:
              <lb/>
            </s>
            <s xml:id="echoid-s428" xml:space="preserve">In cauſa divinanda multi plurimum operæ poſuerunt ab aliquot re-
              <lb/>
            tro ſeculis, verum qualis ſit virium Attractricium proportio ad di-
              <lb/>
            verſa intervalla indagaverunt pauci: </s>
            <s xml:id="echoid-s429" xml:space="preserve">Inter primos, qui ad Magnetis
              <lb/>
            proprietates intelligendas hoc poſtulari rite animadverterunt, & </s>
            <s xml:id="echoid-s430" xml:space="preserve">id-
              <lb/>
            circo proportionem quæſiverunt, fuit artificiofiſſimus Hauksbejus,
              <lb/>
            deinde Nobiliſſimus Taylor, tandem Eruditiſſimus Whiſtonus; </s>
            <s xml:id="echoid-s431" xml:space="preserve">qui
              <lb/>
            varia methodo id Problema ſolvere conati ſunt: </s>
            <s xml:id="echoid-s432" xml:space="preserve">Quoniam vero Hauks-
              <lb/>
            bejana methodus nequidem ipſis Britannis ſatisfecerat, neque mihi
              <lb/>
            adeo ſimplex viſa fuit, ac deſiderari poſſet, idem Problema arripui,
              <lb/>
            conatus id alio ſolvere modo, perquam ſimplici & </s>
            <s xml:id="echoid-s433" xml:space="preserve">naturali, ad
              <lb/>
            quem me conſpectus antea memoratorum Experimentorum deduxit: </s>
            <s xml:id="echoid-s434" xml:space="preserve">
              <lb/>
            Quemadmodum enim ope Stateræ corporum pondera expendimus,
              <lb/>
            ita vires Attractrices ope ponderum in Bilance cognoſci, & </s>
            <s xml:id="echoid-s435" xml:space="preserve">cum iis
              <lb/>
            comparari poſſe videbam, earumque magnitudo in variis oſtendi di-
              <lb/>
            ſtantiis: </s>
            <s xml:id="echoid-s436" xml:space="preserve">quod ut clare intelligatur, methodum deſcribam, ex qua ju-
              <lb/>
            dicium ferri poteſt, utrum ſatis accurrate experimenta inſtituta ſint,
              <lb/>
            tum ut repeti poſſent cum aliis, quam quibus uſus fui Magnetibus,
              <lb/>
            corumque virtus eodem modo explorari & </s>
            <s xml:id="echoid-s437" xml:space="preserve">adnotari.</s>
            <s xml:id="echoid-s438" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s439" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s440" xml:space="preserve">1. </s>
            <s xml:id="echoid-s441" xml:space="preserve">Fig. </s>
            <s xml:id="echoid-s442" xml:space="preserve">2. </s>
            <s xml:id="echoid-s443" xml:space="preserve">Elegi accuratiſſimam Libram XG, cujus
              <lb/>
            axis admodum acutus politusque erat, ut ſuper eo jugum XG lu-
              <lb/>
            briciſſime moveretur, atque ab {1/20} grani parte alterutri extre-
              <lb/>
            mitati G vel X impoſita, deprimeretur; </s>
            <s xml:id="echoid-s444" xml:space="preserve">ut Libræ minima quoque
              <lb/>
            depreſſio manifeſto conſpiceretur, examen ejus in acutiſſimam termi-
              <lb/>
            nabatur cuſpidem, quæ opponebatur pinnulæ tenui V, deorfum promi-
              <lb/>
            nenti ex media ſuperiori parte trutinarum, hæ in latos expanſæ ibi an-
              <lb/>
            nulos, liberum relinquebant obſervationi locum, an examen accu-
              <lb/>
            rate reſponderet pinnulæ, an ab alterutro declinaret latere, & </s>
            <s xml:id="echoid-s445" xml:space="preserve">quan-
              <lb/>
            tum, hoc eſt, an æquilibrium ab utroque Libræ latere foret, an ſe-
              <lb/>
            cus: </s>
            <s xml:id="echoid-s446" xml:space="preserve">ad extremitatem G annexui funem GH, multos pedes longum,
              <lb/>
            ambientemque Magnetem H ſphæricum, quem Terrellam </s>
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