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-s4566" xml:space="preserve">
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            ris 4582 {1/8} granorum horizonti parallela fiebat impoſito grano 1 {1/4}.</s>
            <s xml:id="echoid-s4567" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4568" xml:space="preserve">Ex quibus concludimus vim Magneticam directricem non eſſe
              <lb/>
            magnam, cæteroquin plus ponderis extremitati Auſtrali Acus ap-
              <lb/>
            ponendum fuiſſet ad ſitum horizontalem reſtituendum.</s>
            <s xml:id="echoid-s4569" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div126" type="section" level="1" n="126">
          <head xml:id="echoid-head135" xml:space="preserve">EXPERIMENTUM CII.</head>
          <p>
            <s xml:id="echoid-s4570" xml:space="preserve">Acus Inclinatoria ſuis impoſita excipulis, oſcillationibus agitur,
              <lb/>
            ſurſum deorſumque circa punctum quietis eundo, haud aliter ac pen-
              <lb/>
            dulum horologii adſcendit deſcenditque in vibrationes concitatum.
              <lb/>
            </s>
            <s xml:id="echoid-s4571" xml:space="preserve">Quoniam ex Oſcillationibus Acûs, Magnitudo virtutis directricis
              <lb/>
            Magneticæ cognoſci & </s>
            <s xml:id="echoid-s4572" xml:space="preserve">cum gravitate comparari poſſe videbatur,
              <lb/>
            oportebat ut ad tempus in ſingulâ impenſum oſcillatione accurate
              <lb/>
            attenderetur.</s>
            <s xml:id="echoid-s4573" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4574" xml:space="preserve">Acus Inclinatoria longiſſima 4 pedum ita directa fuit, ut in Me-
              <lb/>
            ridiano Magnetico vibraretur, comparato pendulo, cujus oſcilla-
              <lb/>
            tiones Minuto ſecundo abſolvebantur, Acus dimiſſa fuit ex loco 5
              <lb/>
            gradibus altiore quam punctum quietis erat, adeo ut arcum 10 gra-
              <lb/>
            duum in initio deſcriberet, decem primæ vibrationes Acus peractæ
              <lb/>
            fuerunt in tribus Minutis & </s>
            <s xml:id="echoid-s4575" xml:space="preserve">32 ſecundis: </s>
            <s xml:id="echoid-s4576" xml:space="preserve">decem ſequentes in tribus
              <lb/>
            Minutis & </s>
            <s xml:id="echoid-s4577" xml:space="preserve">12 ſecundis, decem ſequentes in duobus Minutis & </s>
            <s xml:id="echoid-s4578" xml:space="preserve">54
              <lb/>
            ſecundis: </s>
            <s xml:id="echoid-s4579" xml:space="preserve">hæc obſervavi Anno 1728, Martii 26. </s>
            <s xml:id="echoid-s4580" xml:space="preserve">Ex quibus con-
              <lb/>
            ſtat eo breviori tempore oſcillationes abſolvi, quo arcum minorem
              <lb/>
            deſcribit Acus; </s>
            <s xml:id="echoid-s4581" xml:space="preserve">hoc alia omnia tentamina cum diverſis acubus facta
              <lb/>
            conſirmarunt: </s>
            <s xml:id="echoid-s4582" xml:space="preserve">Acu enim Inclinatoriâ 42 pollic. </s>
            <s xml:id="echoid-s4583" xml:space="preserve">etiam in arcubus
              <lb/>
            10 grad. </s>
            <s xml:id="echoid-s4584" xml:space="preserve">oſcillante, 10 primæ vibrationes poſtularunt tempus 2?</s>
            <s xml:id="echoid-s4585" xml:space="preserve">,
              <lb/>
            44?</s>
            <s xml:id="echoid-s4586" xml:space="preserve">, & </s>
            <s xml:id="echoid-s4587" xml:space="preserve">decem aliis adhuc peractis fuit totum elapſum tempus 4?</s>
            <s xml:id="echoid-s4588" xml:space="preserve">,
              <lb/>
            45?</s>
            <s xml:id="echoid-s4589" xml:space="preserve">. Acu Inclinatoriâ 2 pedes longa oſcillante in arcu 10 grad. </s>
            <s xml:id="echoid-s4590" xml:space="preserve">de-
              <lb/>
            cem primæ oſcillationes peractæ fuerunt 1?</s>
            <s xml:id="echoid-s4591" xml:space="preserve">, 45?</s>
            <s xml:id="echoid-s4592" xml:space="preserve">, oſcillationibus de-
              <lb/>
            cem ſequentibus abſolutis totum tempus impenſum fuit 2?</s>
            <s xml:id="echoid-s4593" xml:space="preserve">, 15?</s>
            <s xml:id="echoid-s4594" xml:space="preserve">. idem
              <lb/>
            obſervavit etiam Grahamus in Philoſ. </s>
            <s xml:id="echoid-s4595" xml:space="preserve">Tranſ. </s>
            <s xml:id="echoid-s4596" xml:space="preserve">N°. </s>
            <s xml:id="echoid-s4597" xml:space="preserve">389, atque plu-
              <lb/>
            rimis probavit Experimentis, quæ cum Acu unum pedem longa fe-
              <lb/>
            cit, & </s>
            <s xml:id="echoid-s4598" xml:space="preserve">quæ hic apponenda ſunt, quia ex iis patet vibrationes varia
              <lb/>
            velocitate peragi diebus diverſis, atque eas fere nunquam inter ſe
              <lb/>
            congruere; </s>
            <s xml:id="echoid-s4599" xml:space="preserve">Unde colligimus vim Magnetis directricem non ſemper
              <lb/>
            æqualem eſſe; </s>
            <s xml:id="echoid-s4600" xml:space="preserve">quia gravitas corporum terreſtrium manet </s>
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