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-s3203" xml:space="preserve">
              <pb o="131" file="0145" n="145" rhead="DE MAGNETE."/>
            tur: </s>
            <s xml:id="echoid-s3204" xml:space="preserve">hæ bales ſunt totius operis, his bene poſitis, Magneti poterit elegans
              <lb/>
            quæcunque induci forma, cubica, parallelopipeda, vel quæcun-
              <lb/>
            que alia deſideratur, a locis enim polaribus omnis virtus Magnetica
              <lb/>
            exſpectanda eſt, & </s>
            <s xml:id="echoid-s3205" xml:space="preserve">fere tota dependet. </s>
            <s xml:id="echoid-s3206" xml:space="preserve">Notandum hic imprimts eſt,
              <lb/>
            nunquam Magnetem eſle abbreviandum, locis polaribus bene appla-
              <lb/>
            natis, quia abbreviando ſemper aliquid ſuæ virtutis amitteret, ve-
              <lb/>
            rum poſſunt abſque detrimento alia latera circa axin abſcindi, uti
              <lb/>
            Vallemontius, aliique plures recte animadverterunt.</s>
            <s xml:id="echoid-s3207" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3208" xml:space="preserve">3. </s>
            <s xml:id="echoid-s3209" xml:space="preserve">Formentur deinde ex Ferro molliſſimo, in quo nullæ ſunt ſpinæ,
              <lb/>
            aliquot corpora illius formæ, quam fig, 4. </s>
            <s xml:id="echoid-s3210" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s3211" xml:space="preserve">6. </s>
            <s xml:id="echoid-s3212" xml:space="preserve">repræſentat: </s>
            <s xml:id="echoid-s3213" xml:space="preserve">Sit
              <lb/>
            A B C D pars tenuiſſima, longitudinis & </s>
            <s xml:id="echoid-s3214" xml:space="preserve">latitudinis ejuſdem ac to-
              <lb/>
            tum latus polare armandi Magnetis: </s>
            <s xml:id="echoid-s3215" xml:space="preserve">ad angulum rectum inflexam
              <lb/>
            habeat partem E F craſſiorem, inferius rotundam, ſive in promi-
              <lb/>
            nentiam deſinentem, quæ Pes Armaturæ vocari ſolet.</s>
            <s xml:id="echoid-s3216" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3217" xml:space="preserve">Obſervandum eſt in formando hoc pede a fabro, ut B E ſit pars
              <lb/>
            inflexa Ferri A B, atque ita ſtriarum ferrearum ductus A B E con-
              <lb/>
            tinuati jaceant, exercitati enim in Magnetica arte fabri obſervave-
              <lb/>
            runt, ex pede armaturæ dicto modo formato, Magnetem plus ponde-
              <lb/>
            ris elevare. </s>
            <s xml:id="echoid-s3218" xml:space="preserve">Monui ex Ferro molliſſimo hæc corpora eſſe forman-
              <lb/>
            da, & </s>
            <s xml:id="echoid-s3219" xml:space="preserve">non ex Chalybe, uti perverſe a nonnullis annotatum eſt,
              <lb/>
            ex ferrea enim armatura multo plus ponderis geſtant Magnetes, quam
              <lb/>
            ex Chalybea.</s>
            <s xml:id="echoid-s3220" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3221" xml:space="preserve">4. </s>
            <s xml:id="echoid-s3222" xml:space="preserve">Sed quantæ craſſitiei poſtulatur Ferrum A B C D? </s>
            <s xml:id="echoid-s3223" xml:space="preserve">hoc deter-
              <lb/>
            minatu a priori eſt difficillimum: </s>
            <s xml:id="echoid-s3224" xml:space="preserve">laminæ craſſitiei diverſæ & </s>
            <s xml:id="echoid-s3225" xml:space="preserve">lon-
              <lb/>
            gitudinis A B prius ſuper polo Magnetis ducantur, atque explore-
              <lb/>
            tur, quænam maximis ab eo viribus imprægnetur, ſecundum Ex-
              <lb/>
            perimentum XXXI. </s>
            <s xml:id="echoid-s3226" xml:space="preserve">hujus craſſities erit ea, quæ deſideratur in
              <lb/>
            A B C D: </s>
            <s xml:id="echoid-s3227" xml:space="preserve">ſolet cæteroquin tentando explorari ex quanam armatura
              <lb/>
            plurimum Ferri geſtetur, conficiuntur aliquot nempe ferramenta
              <lb/>
            A B C D E F diverſæ craſſitiei, his armatur Magnes, & </s>
            <s xml:id="echoid-s3228" xml:space="preserve">quæ fortiſ-
              <lb/>
            ſime Ferrum elevant, eliguntur. </s>
            <s xml:id="echoid-s3229" xml:space="preserve">Alii ſupra laminam A B, Magneti
              <lb/>
            applicatam, ſcobem ſpargunt, quæ ſi valde attrahatur & </s>
            <s xml:id="echoid-s3230" xml:space="preserve">erigatur,
              <lb/>
            nimis tenuem eſſe A B judicant: </s>
            <s xml:id="echoid-s3231" xml:space="preserve">ſi vero vix aut nequaquam attra-
              <lb/>
            hitur, eam minus craſſam pronunciant, atque eo uſque eſſe atte-
              <lb/>
            nuandam, donec aliquid ſcobis attrahat.</s>
            <s xml:id="echoid-s3232" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3233" xml:space="preserve">Duo ejuſmodi corpora ferrea accuratiſſime polita & </s>
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