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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            alias Acus Magneticas, adnotavimus</s>
          </p>
          <p>
            <s xml:id="echoid-s5398" xml:space="preserve">Acus Magneticæ, quas etiam Verſoria vocavimus, conſtruendæ
              <lb/>
            ſunt ex Chalybe puriſſimo, in quo nullæ ſunt ſpinæ, ſeu partes aliis
              <lb/>
            duriores, neque dentur fiſſuræ aut rimæ, hæ utcunque tenues fuerint,
              <lb/>
            ſollicite ſunt evitandæ; </s>
            <s xml:id="echoid-s5399" xml:space="preserve">hinc maſſa, ex quâ Acus fabrefiet, ſit bene
              <lb/>
            ſolida, unitaque quantum fieri poteſt: </s>
            <s xml:id="echoid-s5400" xml:space="preserve">Chalybs elegatur potius,
              <lb/>
            quam Ferrum, quia a Magnete multo majoribus, & </s>
            <s xml:id="echoid-s5401" xml:space="preserve">uti ſupra no-
              <lb/>
            tatum eſt, quidem ſepties fortio ribus, viribus imprægnari poteſt,
              <lb/>
            imo eas per longius temporis intervallum retinet.</s>
            <s xml:id="echoid-s5402" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5403" xml:space="preserve">Quæſitum fuit â multis, quantæ longitudinis Acum componere
              <lb/>
            licet, ut mobiliſſima ſit, & </s>
            <s xml:id="echoid-s5404" xml:space="preserve">ſimul accuratiſſime dirigatur eam ver-
              <lb/>
            ſus coeli plagam, quo tendit Magnes: </s>
            <s xml:id="echoid-s5405" xml:space="preserve">ratio dictitat longiores uſi-
              <lb/>
            bus humanis fore maxime accommodatas, quia non tantum gradus,
              <lb/>
            quibus declinant a vero Septentrione, ſed etiam Minuta oſtende-
              <lb/>
            re poſſunt; </s>
            <s xml:id="echoid-s5406" xml:space="preserve">verum experientia arctos rationi ponit limites, nec
              <lb/>
            quamlibet longitudinem acubus concedit, monet Sturmius in Col-
              <lb/>
            leg. </s>
            <s xml:id="echoid-s5407" xml:space="preserve">Curioſ. </s>
            <s xml:id="echoid-s5408" xml:space="preserve">Phyſ. </s>
            <s xml:id="echoid-s5409" xml:space="preserve">part. </s>
            <s xml:id="echoid-s5410" xml:space="preserve">2. </s>
            <s xml:id="echoid-s5411" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s5412" xml:space="preserve">235, tum in Phyſic. </s>
            <s xml:id="echoid-s5413" xml:space="preserve">Elect. </s>
            <s xml:id="echoid-s5414" xml:space="preserve">Tom. </s>
            <s xml:id="echoid-s5415" xml:space="preserve">2.
              <lb/>
            </s>
            <s xml:id="echoid-s5416" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s5417" xml:space="preserve">1103. </s>
            <s xml:id="echoid-s5418" xml:space="preserve">Acum unum pedem longam non valere, nec bene diri-
              <lb/>
            gi, quia præter binos ad extremitates polos, adhuc aliis duobus in
              <lb/>
            medio donata erat, qui mobilitatem & </s>
            <s xml:id="echoid-s5419" xml:space="preserve">vim directricem imminue-
              <lb/>
            bant & </s>
            <s xml:id="echoid-s5420" xml:space="preserve">turbabant, quos permanſiſſe obſervavit, etiamſi Acum ab-
              <lb/>
            breviaverit, ut longitudinem 7 pollicum non excederet; </s>
            <s xml:id="echoid-s5421" xml:space="preserve">quamob-
              <lb/>
            rem Vir experientiſſimus judicabat Acus non longiores 6 pollicibus
              <lb/>
            eſſe conſiciendas: </s>
            <s xml:id="echoid-s5422" xml:space="preserve">bini in medio Acus a Sturmio notati poli puncta
              <lb/>
            Conſequentia a nobis vocata fuerunt, quæcunque hæc ſpectant in
              <lb/>
            Acu aut virgâ longiori monui ſuperius. </s>
            <s xml:id="echoid-s5423" xml:space="preserve">Acus noſtra horizontalis,
              <lb/>
            quæ eſt 12 pollicum, 10 linearum ſtylo impoſita, mobiliſſima eſt,
              <lb/>
            ex meridiano turbata diutiſſime continuat ſuas oſcillationes, atque
              <lb/>
            lubrico motu ſuperat Acuum breviorum oſcillationes; </s>
            <s xml:id="echoid-s5424" xml:space="preserve">eſt autem in
              <lb/>
            perpetuo poſita motu, & </s>
            <s xml:id="echoid-s5425" xml:space="preserve">varia directione agitur, nunc excedenti
              <lb/>
            gradus 13°, 20?</s>
            <s xml:id="echoid-s5426" xml:space="preserve">; aliquot minutis, nunc ab iis deficienti, quemad-
              <lb/>
            modum Grahami obſervationes, ſupra a nobis allatæ, etiam oſten-
              <lb/>
            derunt, idcirco ejus ope determinari commode nequit, quanta ſit
              <lb/>
            Acus Declinatio; </s>
            <s xml:id="echoid-s5427" xml:space="preserve">Cl. </s>
            <s xml:id="echoid-s5428" xml:space="preserve">de la Hirius tamen commendavit Acum 12
              <lb/>
            vel plures pollices longam in L’Hiſt. </s>
            <s xml:id="echoid-s5429" xml:space="preserve">de L’Acad. </s>
            <s xml:id="echoid-s5430" xml:space="preserve">Roy. </s>
            <s xml:id="echoid-s5431" xml:space="preserve">A°. </s>
            <s xml:id="echoid-s5432" xml:space="preserve">1716, ad
              <lb/>
            ſubtiles obſervationes capiendas, ſi Declinationem intellexerit, </s>
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