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="231" file="0245" n="245" rhead="De MAGNETE"/>
            bito, an hanc quidem determinare auxilio tam longæ Acuspoſſet: </s>
            <s xml:id="echoid-s5433" xml:space="preserve">mihi
              <lb/>
            exploranti diverſiſſimas Acus uſque ad 3 pedes longas, arriſerunt
              <lb/>
            maxime, quæ 6 pollices non excedebant, quæ expertes ſunt Pun-
              <lb/>
            ctorum Conſequentium, modo fuerint ex bono confectæ Chaly-
              <lb/>
            be, & </s>
            <s xml:id="echoid-s5434" xml:space="preserve">rite ſuper Magnetis polo ductæ. </s>
            <s xml:id="echoid-s5435" xml:space="preserve">Neque poſtulantur lon-
              <lb/>
            giores ad obſervationes ſubtiliſſimas capiendas, earum enim ope
              <lb/>
            Declinationes uſque ad minuta obſervari & </s>
            <s xml:id="echoid-s5436" xml:space="preserve">diſtingui poſſe, mox
              <lb/>
            liquebit.</s>
            <s xml:id="echoid-s5437" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5438" xml:space="preserve">Non minoris momenti eſt craſſitiem Acuum notaſſe, quam lon-
              <lb/>
            gitudinem, quippe ſi Acus componantur admodum leves graciles-
              <lb/>
            que, non tam lubrice mobiles exiſtunt, nec tam conſtanter ad eun-
              <lb/>
            dem revertuntur locum, ex Meridiano ſuo turbatæ, quam quidem
              <lb/>
            craſſiores: </s>
            <s xml:id="echoid-s5439" xml:space="preserve">aliquam 6 longam pollices, ponderis 8 granorum ex-
              <lb/>
            ploravi, quæ vix in oſcillationes reducebatur, illico quieſcens,
              <lb/>
            nunquam ad verum rediens Magneticum Meridianum, & </s>
            <s xml:id="echoid-s5440" xml:space="preserve">quamvis
              <lb/>
            levitas attritum ſupra ſtylum imminuendo mobilitatem magnam ad-
              <lb/>
            ferre videretur, attamen nimis exigua Ferri moles deprehendeba-
              <lb/>
            tur, quæ dirigeretur a vi Magnetica, & </s>
            <s xml:id="echoid-s5441" xml:space="preserve">attritum qualemcunque
              <lb/>
            ſupra ſtylum ſuperaret: </s>
            <s xml:id="echoid-s5442" xml:space="preserve">difficile eſt determinatu quænam craſſities
              <lb/>
            Acubus diverſæ longitudinis conveniat: </s>
            <s xml:id="echoid-s5443" xml:space="preserve">ſi craſſiores feceris, pon-
              <lb/>
            dere nimio ſtylum prement, atque attritum augendo, immobilio-
              <lb/>
            res reddentur: </s>
            <s xml:id="echoid-s5444" xml:space="preserve">ſi Acus 6 pollicum conſtruatur, caveto ne ejus pon-
              <lb/>
            dus ſit minus 50 granis, pondus dico, hoc enim craſſitiem ſatis
              <lb/>
            determinat; </s>
            <s xml:id="echoid-s5445" xml:space="preserve">hujus longitudinis Acus 200 granorum adhuc agillima
              <lb/>
            eſt, hinc licebit ejuſmodi craſſitiem eligere, quæ pondus aliquod
              <lb/>
            intermedium inter 50 & </s>
            <s xml:id="echoid-s5446" xml:space="preserve">200 grana efficit: </s>
            <s xml:id="echoid-s5447" xml:space="preserve">craſſities aliarum longi-
              <lb/>
            tudinum exinde quodammodo colligi poſſunt, eas non tanta cum
              <lb/>
            cura exploravi, quali tamen præſtantes Acus pondere donari poſ-
              <lb/>
            ſunt, ex Experimento CVII. </s>
            <s xml:id="echoid-s5448" xml:space="preserve">ſatis apparet; </s>
            <s xml:id="echoid-s5449" xml:space="preserve">in genere notetur, pondus
              <lb/>
            majus, craſſiuſque corpus non adeo mobilitatem tollere, quam prima
              <lb/>
            fronte appareret, nihil vero plus nocet quam nimia gracilitas.</s>
            <s xml:id="echoid-s5450" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5451" xml:space="preserve">Figura præſtat ſimpliciſſima, recta, utrimque in apicem deſi-
              <lb/>
            nens; </s>
            <s xml:id="echoid-s5452" xml:space="preserve">idem eſt ſive rotunda, cylindrica, conicave fuerit, ſive planis
              <lb/>
            ſuperficiebus donetur;</s>
            <s xml:id="echoid-s5453" xml:space="preserve">male autem inſtar ſagittæ formantur Acus, vel-
              <lb/>
            uti Tab. </s>
            <s xml:id="echoid-s5454" xml:space="preserve">4. </s>
            <s xml:id="echoid-s5455" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s5456" xml:space="preserve">9 aliqua E O F picta eſt, ubi cuſpis lilio, cauda plumâ in-
              <lb/>
            ſtruitur, aut ſimilibus figuris: </s>
            <s xml:id="echoid-s5457" xml:space="preserve">præterquam enim quod hæ non </s>
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