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="159" file="0173" n="173" rhead="de MAGNETE."/>
          <note position="right" xml:space="preserve">
            <lb/>
          Grad. # M. # Horæ # M.
            <lb/>
          14 + # # 7 # 30
            <lb/>
          14 # 5 # 7 # 45
            <lb/>
          14 + # # 12 # 0
            <lb/>
          </note>
          <p>
            <s xml:id="echoid-s3985" xml:space="preserve">Plures obſervationes in citatis actis conſpici poſſunt: </s>
            <s xml:id="echoid-s3986" xml:space="preserve">notat ob-
              <lb/>
            ſervator ſe ultra 1000 obſervationes feciſſe in eodem loco cum iiſ-
              <lb/>
            dem Acubus, quæ omnes ſibi fuerunt ſimiles. </s>
            <s xml:id="echoid-s3987" xml:space="preserve">Sunt hæc Experi-
              <lb/>
            menta plane contraria iis, quæ Cabeus Lib. </s>
            <s xml:id="echoid-s3988" xml:space="preserve">1. </s>
            <s xml:id="echoid-s3989" xml:space="preserve">Cap. </s>
            <s xml:id="echoid-s3990" xml:space="preserve">16. </s>
            <s xml:id="echoid-s3991" xml:space="preserve">notavit,
              <lb/>
            in eodem loco eandem perpetuo Declinationem fore, audacter pro-
              <lb/>
            nuncians.</s>
            <s xml:id="echoid-s3992" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3993" xml:space="preserve">Cl. </s>
            <s xml:id="echoid-s3994" xml:space="preserve">Mullerus in Collegio Experim. </s>
            <s xml:id="echoid-s3995" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s3996" xml:space="preserve">237. </s>
            <s xml:id="echoid-s3997" xml:space="preserve">Obſervationem ſui
              <lb/>
            fratris affert, notantis Acum in verticibus montium 10, 20, 50,
              <lb/>
            imo 90 gradibus plus aberrare, quam ad eorum radicem, idque ob-
              <lb/>
            tinere in montibus Bohemiæ & </s>
            <s xml:id="echoid-s3998" xml:space="preserve">prope vetus Briſacum, dicitur etiam
              <lb/>
            ibidem, id obſervatum in montibus Saxoniæ fuiſſe: </s>
            <s xml:id="echoid-s3999" xml:space="preserve">meretur hoc pa-
              <lb/>
            radaxon ulterius examinari in locis montoſis, ut & </s>
            <s xml:id="echoid-s4000" xml:space="preserve">confirmetur, & </s>
            <s xml:id="echoid-s4001" xml:space="preserve">
              <lb/>
            inde multum lucis doctrinæ Magneticæ adferatur; </s>
            <s xml:id="echoid-s4002" xml:space="preserve">nam Ferrum, quod
              <lb/>
            plurimi montes gerunt, etiam magnam varietatem hiſce & </s>
            <s xml:id="echoid-s4003" xml:space="preserve">ſimili-
              <lb/>
            bus obſervationibus adferre potuiſſet.</s>
            <s xml:id="echoid-s4004" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4005" xml:space="preserve">Manifeſto igitur ex ſuperioribus obſervationibus conſtat: </s>
            <s xml:id="echoid-s4006" xml:space="preserve">Decli-
              <lb/>
            nationem Acus Magneticæ eſſe obnoxiam perpetuis mutationibus
              <lb/>
            in eodem Terræ loco, uti Pariſiis & </s>
            <s xml:id="echoid-s4007" xml:space="preserve">Londini; </s>
            <s xml:id="echoid-s4008" xml:space="preserve">& </s>
            <s xml:id="echoid-s4009" xml:space="preserve">idem obtinere per-
              <lb/>
            univerſum Terrarum orbem: </s>
            <s xml:id="echoid-s4010" xml:space="preserve">Nunc nonnulla loca ſunt libera a De-
              <lb/>
            clinatione, in quibus Magnes directe reſpicit Boream & </s>
            <s xml:id="echoid-s4011" xml:space="preserve">Auſtrum,
              <lb/>
            verum ſequentianno in iis declinabit Magnes verſus Ortum vel Occa-
              <lb/>
            ſum. </s>
            <s xml:id="echoid-s4012" xml:space="preserve">In aliis Terræ plagis nunc parum declinat, ſequentiautem anno
              <lb/>
            magis, ita ut perpetua in Declinatione Magnetis per Univerſam Ter-
              <lb/>
            ram obtineat varietas; </s>
            <s xml:id="echoid-s4013" xml:space="preserve">hæc adfert ſummam difficultatem doctrinæ Ma-
              <lb/>
            gneticæ, imprimis cum nondum multas poſſidemus obſervationes, & </s>
            <s xml:id="echoid-s4014" xml:space="preserve">
              <lb/>
            quas habemus earum plurimæ adhuc non ſunt cum cura ſufficienti fa-
              <lb/>
            ctæ, præſtaret, ſi inſtituerentur eodem anno in omnibus partibus Terræ
              <lb/>
            & </s>
            <s xml:id="echoid-s4015" xml:space="preserve">Oceanorum ſimul, atque per plurimos continuarentur annos, tum
              <lb/>
            enim decurſus Declinationis innoteſceret, & </s>
            <s xml:id="echoid-s4016" xml:space="preserve">forſitan ex eo ſimul cauſa
              <lb/>
            & </s>
            <s xml:id="echoid-s4017" xml:space="preserve">virtus Magnetis detegeretur: </s>
            <s xml:id="echoid-s4018" xml:space="preserve">Ex rudi tamen Chao obſervationum Vir
              <lb/>
            Sagaciſſimus ſummoque præditus ingenio, Edm Halleyus Syſthema
              <lb/>
            aliquod condidit quod licet (ipſo fatente Philoſopho) rude adhuc ſit, &</s>
            <s xml:id="echoid-s4019" xml:space="preserve"/>
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