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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        <div xml:id="echoid-div30" type="section" level="1" n="30">
          <p>
            <s xml:id="echoid-s1268" xml:space="preserve">
              <pb o="55" file="0069" n="69" rhead="DE MAGNETE."/>
            do de Acu Inclinatoria agam; </s>
            <s xml:id="echoid-s1269" xml:space="preserve">ſuſpicabar an in noſtris Experimentis,
              <lb/>
            in quibus Magnetem unum ſupra alterum ſuſpendebam ex Libra, et-
              <lb/>
            iam non oriretur quædam depreſſio Magnetis horizontem verſus ra-
              <lb/>
            tione virtutis Univerſalis directricis, atque ita pertur baretur accura-
              <lb/>
            ta menſura virium attractricium; </s>
            <s xml:id="echoid-s1270" xml:space="preserve">verum evanuit ſcrupulus, cum
              <lb/>
            animadvertebam hanc vim directricem deprimentem Magnetem ef-
              <lb/>
            ficere quaſi quandam partem gravitatis Magnetis; </s>
            <s xml:id="echoid-s1271" xml:space="preserve">& </s>
            <s xml:id="echoid-s1272" xml:space="preserve">quia hæc vis
              <lb/>
            ope ponderis ſimul cum gravitate ad æquilibrium reducebatur ante
              <lb/>
            inſtitutum Experimentum, & </s>
            <s xml:id="echoid-s1273" xml:space="preserve">ſemper manebat æque magna, non
              <lb/>
            poterat turbare obſervationes circa attractiones factas.</s>
            <s xml:id="echoid-s1274" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div31" type="section" level="1" n="31">
          <head xml:id="echoid-head39" xml:space="preserve">EXPERIMENTUM XXIII.</head>
          <p>
            <s xml:id="echoid-s1275" xml:space="preserve">Parallelopipedum ferreum, pondere 5 librarum, in lance ænea
              <lb/>
            poſitum, pendente ex æneis catenis Libræ adnexis ad æquilibrium
              <lb/>
            ope ponderum oppoſitæ lanci immiſſorum reductum fuit, tum igni
              <lb/>
            commiſſum eſt vehementi, donec ruberet, non tamen ſcintillaret,
              <lb/>
            deinde rurſus eidem impoſitum eſt lanci, infra quam Magnes ſphæ-
              <lb/>
            ricus major NO Tab. </s>
            <s xml:id="echoid-s1276" xml:space="preserve">1 fig. </s>
            <s xml:id="echoid-s1277" xml:space="preserve">2. </s>
            <s xml:id="echoid-s1278" xml:space="preserve">habebatur, ad diſtantiam duorum accurate
              <lb/>
            pollicum: </s>
            <s xml:id="echoid-s1279" xml:space="preserve">ſtatim deorſum tractum fuit hoc ignitum ferrum a Magne-
              <lb/>
            te; </s>
            <s xml:id="echoid-s1280" xml:space="preserve">tum vero vis attractrix explorabatur, injectis alteri lanci pon-
              <lb/>
            deribus uſque ad æquilibrium; </s>
            <s xml:id="echoid-s1281" xml:space="preserve">inter refrigerandum continuo magis
              <lb/>
            magiſque increvit Magnetis attractio, quæ æqualis erat 3 granis,
              <lb/>
            â ſummo calore uſque ad eum, quem manus vix vix ferebat; </s>
            <s xml:id="echoid-s1282" xml:space="preserve">ſed
              <lb/>
            ferro ad eundem calorem cum atmoſphærico aere redeunte, iterum
              <lb/>
            increſcebat attractio 4 granis, adeo ut tora diſſerentia attractionis
              <lb/>
            a ſummo calore uſque ad eum, qui in aere erat, fuerit in diſtantia
              <lb/>
            2 pollicum æqualis 7 granis; </s>
            <s xml:id="echoid-s1283" xml:space="preserve">vis tamen hujus Magnetis in idem fer-
              <lb/>
            rum frigidum fuit 16 granorum, adeoque fere ad dimidium decre-
              <lb/>
            vit poſito ferro calidiſſimo. </s>
            <s xml:id="echoid-s1284" xml:space="preserve">Repetitum poſtea fuit Experimentum cum
              <lb/>
            eodem Magnete & </s>
            <s xml:id="echoid-s1285" xml:space="preserve">Ferro, a ſe invicem uno pollice remotis; </s>
            <s xml:id="echoid-s1286" xml:space="preserve">frigidum
              <lb/>
            adhuc ferrum a Magnete attrahebatur vi 61 granorum, ſed igne ſum-
              <lb/>
            mo candefactum vi 26 granorum; </s>
            <s xml:id="echoid-s1287" xml:space="preserve">adco ut differentia attractionis fue-
              <lb/>
            rit 35 granorum, vehementius in hoc Experimento calebat ferrum
              <lb/>
            quam in priori, & </s>
            <s xml:id="echoid-s1288" xml:space="preserve">ideo vis Magnetis in hoc magis decrevit. </s>
            <s xml:id="echoid-s1289" xml:space="preserve"/>
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