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-s1591" xml:space="preserve">
              <pb o="67" file="0081" n="81" rhead="DE MAGNETE."/>
            fabri lances facere ſolent: </s>
            <s xml:id="echoid-s1592" xml:space="preserve">tum ſumſi ferreos cylindros longos, aut
              <lb/>
            virgas, quorum pondera fuerunt 2500, 6800, 14580 granorum,
              <lb/>
            his prius accuratiſſime notatis, ferramenta affricui præſtanti
              <lb/>
            Magneti, & </s>
            <s xml:id="echoid-s1593" xml:space="preserve">ſingula ſeorſim iterum examinavi in media camera,
              <lb/>
            ne ulla actio in ferream Libram, aut in aliquod Ferrum pavimenti
              <lb/>
            vel lacunaris exerceri poſſet per vim Magnetis communicatam: </s>
            <s xml:id="echoid-s1594" xml:space="preserve">fa-
              <lb/>
            teor autem me in hiſce omnibus caſibus nullam differentiam pon-
              <lb/>
            deris obſervare potuiſſe: </s>
            <s xml:id="echoid-s1595" xml:space="preserve">ut certior fierem, an Libra quidem ſatis
              <lb/>
            mobilis foret, grani dimidium alterutri imponebam parti, a quo
              <lb/>
            deprimebatur, unde de illius mobilitate dubitare non poteram. </s>
            <s xml:id="echoid-s1596" xml:space="preserve">Mi-
              <lb/>
            rabar hoc omnino, quia hæc Experimenta non congruebant cum
              <lb/>
            Whiſtonianis, quæ profecto etiam a Viris exercitatiſſimis inſtituta
              <lb/>
            ſunt, quibus plus dexteritatis & </s>
            <s xml:id="echoid-s1597" xml:space="preserve">accurationis in capiendis experi-
              <lb/>
            mentis, quam mihi ipſi adſcribo; </s>
            <s xml:id="echoid-s1598" xml:space="preserve">mihi itaque primum non confiſus,
              <lb/>
            cum aliis virgis & </s>
            <s xml:id="echoid-s1599" xml:space="preserve">parallelopipedis ferreis cùm 8050, tum 15565 gra-
              <lb/>
            norum alio die inſtitui tentamina, & </s>
            <s xml:id="echoid-s1600" xml:space="preserve">attendi ad omnia quæ Expe-
              <lb/>
            rimentum turbare poſſent, deponens quicquid ferri gerebam, axin
              <lb/>
            trutinamque Libræ abſterſi, acuique, ut mobiliſſima omnino eſſet
              <lb/>
            Libra, inſtitutis vero iterum tentaminibus, idem pondus manſiſſe
              <lb/>
            obſervavi: </s>
            <s xml:id="echoid-s1601" xml:space="preserve">Quamobrem hic varius Experimentorum eventus pen-
              <lb/>
            det, vel a diverſâ vi, qua varii Magnetes in Ferrum agunt, quorum
              <lb/>
            alius Ferrum redderet levius, alter idem pondus in eo relinqueret;
              <lb/>
            </s>
            <s xml:id="echoid-s1602" xml:space="preserve">vel a diverſa cura, quacum experimenta capta ſunt; </s>
            <s xml:id="echoid-s1603" xml:space="preserve">quod ſi Whi-
              <lb/>
            ſtoniana examinemus, aliquid miri in ſe comprehendere videntur: </s>
            <s xml:id="echoid-s1604" xml:space="preserve">
              <lb/>
            Ferrum 4585 {1/8} granorum amittit 2 {5/8} grana: </s>
            <s xml:id="echoid-s1605" xml:space="preserve">aliud gravius & </s>
            <s xml:id="echoid-s1606" xml:space="preserve">14792 {1/2}
              <lb/>
            granorum amittit 2 {1/2} grana: </s>
            <s xml:id="echoid-s1607" xml:space="preserve">adeoque Ferrum gravius minus ponderis a-
              <lb/>
            miſiſſet, quam levius, cum in alio Experimento graviſſimum Ferrum
              <lb/>
            65726 granorum amiſerit 14 grana, adeoque iterum plus; </s>
            <s xml:id="echoid-s1608" xml:space="preserve">quæ non ad-
              <lb/>
            modum inter ſe congruere videntur, cur enim illudFerrum 14792 {1/2} gra-
              <lb/>
            norum non amiſit plus ponderis poſtquam Magneti affrictum fuit
              <lb/>
            quam illud 4585 {1/8} gran.</s>
            <s xml:id="echoid-s1609" xml:space="preserve">? attamen Whiſtoniana obſervata negari ne-
              <lb/>
            queunt, quia continent modo Experimenta: </s>
            <s xml:id="echoid-s1610" xml:space="preserve">facile autem in ponderan-
              <lb/>
            do corpore aliquem errorem committimus ſi adminimas circumſtantias
              <lb/>
            non attendamus, ut expertus didici Cum enim in initio Experimentum
              <lb/>
            Whiſtonirepetebam, ſuſpendi virgas ferreas ex fune cannabino, longo,
              <lb/>
            anſerini calami craſſitie; </s>
            <s xml:id="echoid-s1611" xml:space="preserve">quid fit? </s>
            <s xml:id="echoid-s1612" xml:space="preserve">ignem forte in loco, in quo </s>
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