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-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,
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            in quibus Magnetem unum ſupra alterum ſuſpendebam ex Libra, et-
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            iam non oriretur quædam depreſſio Magnetis horizontem verſus ra-
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            tione virtutis Univerſalis directricis, atque ita pertur baretur accura-
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            ta menſura virium attractricium; </s>
            <s xml:id="echoid-s1270" xml:space="preserve">verum evanuit ſcrupulus, cum
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            animadvertebam hanc vim directricem deprimentem Magnetem ef-
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            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
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            ope ponderis ſimul cum gravitate ad æquilibrium reducebatur ante
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            inſtitutum Experimentum, & </s>
            <s xml:id="echoid-s1273" xml:space="preserve">ſemper manebat æque magna, non
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            poterat turbare obſervationes circa attractiones factas.</s>
            <s xml:id="echoid-s1274" xml:space="preserve"/>
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        <div xml:id="echoid-div31" type="section" level="1" n="31">
          <head xml:id="echoid-head39" xml:space="preserve">EXPERIMENTUM XXIII.</head>
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            <s xml:id="echoid-s1275" xml:space="preserve">Parallelopipedum ferreum, pondere 5 librarum, in lance ænea
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            poſitum, pendente ex æneis catenis Libræ adnexis ad æquilibrium
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            ope ponderum oppoſitæ lanci immiſſorum reductum fuit, tum igni
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            commiſſum eſt vehementi, donec ruberet, non tamen ſcintillaret,
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            deinde rurſus eidem impoſitum eſt lanci, infra quam Magnes ſphæ-
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            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
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            pollicum: </s>
            <s xml:id="echoid-s1279" xml:space="preserve">ſtatim deorſum tractum fuit hoc ignitum ferrum a Magne-
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            te; </s>
            <s xml:id="echoid-s1280" xml:space="preserve">tum vero vis attractrix explorabatur, injectis alteri lanci pon-
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            deribus uſque ad æquilibrium; </s>
            <s xml:id="echoid-s1281" xml:space="preserve">inter refrigerandum continuo magis
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            magiſque increvit Magnetis attractio, quæ æqualis erat 3 granis,
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            â ſummo calore uſque ad eum, quem manus vix vix ferebat; </s>
            <s xml:id="echoid-s1282" xml:space="preserve">ſed
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            ferro ad eundem calorem cum atmoſphærico aere redeunte, iterum
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            increſcebat attractio 4 granis, adeo ut tora diſſerentia attractionis
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            a ſummo calore uſque ad eum, qui in aere erat, fuerit in diſtantia
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            2 pollicum æqualis 7 granis; </s>
            <s xml:id="echoid-s1283" xml:space="preserve">vis tamen hujus Magnetis in idem fer-
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            rum frigidum fuit 16 granorum, adeoque fere ad dimidium decre-
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            vit poſito ferro calidiſſimo. </s>
            <s xml:id="echoid-s1284" xml:space="preserve">Repetitum poſtea fuit Experimentum cum
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            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
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            adhuc ferrum a Magnete attrahebatur vi 61 granorum, ſed igne ſum-
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            mo candefactum vi 26 granorum; </s>
            <s xml:id="echoid-s1287" xml:space="preserve">adco ut differentia attractionis fue-
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            rit 35 granorum, vehementius in hoc Experimento calebat ferrum
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            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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