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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              <pb o="249" file="0263" n="263" rhead="DE MAGNETE."/>
            in hoc Capite commemoravimus, non inter facillima intellectu po-
              <lb/>
            nenda; </s>
            <s xml:id="echoid-s5897" xml:space="preserve">nunc ignoratâ cauſâ, inſtar talparum fodimus, quærimus,
              <lb/>
            inveſtigamus, anfractuoſas ingredimur vias, aliquando ſteriles, ali-
              <lb/>
            quando exiguum laborum fructum afferentes; </s>
            <s xml:id="echoid-s5898" xml:space="preserve">id tamen poteſt nobis
              <lb/>
            eſſe ſolatii, Experimentum recte inſtitutum, accurate cum omnibus
              <lb/>
            circumſtantiis obſervatum, manere Experimentum, hoc eſt ſemper
              <lb/>
            verum, & </s>
            <s xml:id="echoid-s5899" xml:space="preserve">alicujus uſus; </s>
            <s xml:id="echoid-s5900" xml:space="preserve">neque illis unquam ſubjici viciſſitudinibus,
              <lb/>
            quibus ratiocinium, utcunque ſubtile, ex levi obortum hypo-
              <lb/>
            theſi.</s>
            <s xml:id="echoid-s5901" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div154" type="section" level="1" n="154">
          <head xml:id="echoid-head163" xml:space="preserve">EXPERIMENTUM CXXVIII.</head>
          <p>
            <s xml:id="echoid-s5902" xml:space="preserve">Prope Verſorii alterutram extremitatem teneatur aliquod Ferrum,
              <lb/>
            non imprægnatum vi Magnetica, niſi quam ſua ſponte acquirit,
              <lb/>
            Verſorii directionem mutabit, ad ſe alliciet, non aliter quam verus
              <lb/>
            Magnes; </s>
            <s xml:id="echoid-s5903" xml:space="preserve">motum proinde ejus ſequetur Verſorium, quod in orbem
              <lb/>
            converti, variis in plagis ſiſti, dirigique poteſt pro lubitu, moto
              <lb/>
            tantummodo Ferro: </s>
            <s xml:id="echoid-s5904" xml:space="preserve">ſi autem vi donatum Magnetica ſit, Verſorium
              <lb/>
            longe vehementius attrahet in eadem diſtantiâ ac ante, aut multo
              <lb/>
            remotius poſitum nihilominus operationem ſuam demonſtrabit.</s>
            <s xml:id="echoid-s5905" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div155" type="section" level="1" n="155">
          <head xml:id="echoid-head164" xml:space="preserve">EXPERIMENTUM CXXIX.</head>
          <p>
            <s xml:id="echoid-s5906" xml:space="preserve">Explorandum adhuc erat, quomodo duo Verſoria, vi Magneti-
              <lb/>
            câ donata, poſita in eodem horizontali plano intra mutuæ actionis
              <lb/>
            ſphæram in ſe operarentur: </s>
            <s xml:id="echoid-s5907" xml:space="preserve">unum Verſorium, quod huic Experi-
              <lb/>
            mento inſerviit, erat 6 {3/4} pol. </s>
            <s xml:id="echoid-s5908" xml:space="preserve">longum, alterum 9 poll. </s>
            <s xml:id="echoid-s5909" xml:space="preserve">utrumque ſuo
              <lb/>
            ſtylo, ſupra quem libere poterat converti, imponebatur: </s>
            <s xml:id="echoid-s5910" xml:space="preserve">erat alte-
              <lb/>
            rum alteri parallelum; </s>
            <s xml:id="echoid-s5911" xml:space="preserve">utrumque cuſpide Borea ſpectabat Boreum;
              <lb/>
            </s>
            <s xml:id="echoid-s5912" xml:space="preserve">centra utriuſque ſive ſtyli jacebant in recta Æquatori Magnetico
              <lb/>
            parallela, in qua pro lubitu propius ſibi, aut remotius iterum, pone-
              <lb/>
            bantur, quo Verſoria tantundem ad ſe accedebant: </s>
            <s xml:id="echoid-s5913" xml:space="preserve">erat Verſorium
              <lb/>
            brevius ad Ortum longioris ſitum: </s>
            <s xml:id="echoid-s5914" xml:space="preserve">tum 1° diſtantibus ſtylis a ſe 4
              <lb/>
            pollicibus, acceſſerunt ambo poli Borei ad ſe parum, atque tantun-
              <lb/>
            dem receſſerunt Auſtrales a ſe: </s>
            <s xml:id="echoid-s5915" xml:space="preserve">admotis propius ſtylis, ut tantum
              <lb/>
            3 poll: </s>
            <s xml:id="echoid-s5916" xml:space="preserve">a ſe diſtarent, receſſerunt a ſe poli Borei parum, </s>
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