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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            non modo potentia trahens agit in Acum, ſed in fluvium quoque, & </s>
            <s xml:id="echoid-s1241" xml:space="preserve">
              <lb/>
            ſuperandam habet vim fluminis in illam incurrentis lateraliter, eam-
              <lb/>
            que propellentis recta, juxta ſui curſus determinationem eſtque flu-
              <lb/>
            minis incurrentis vis ſemper eo major, quo Acus ſitum flumini plus
              <lb/>
            oppoſitum accipit: </s>
            <s xml:id="echoid-s1242" xml:space="preserve">vis trahens & </s>
            <s xml:id="echoid-s1243" xml:space="preserve">inflectens Acum, agit hic igitur in
              <lb/>
            Acum & </s>
            <s xml:id="echoid-s1244" xml:space="preserve">ſimul in vim directricem fluminis, & </s>
            <s xml:id="echoid-s1245" xml:space="preserve">non in Acum ſolam,
              <lb/>
            quatenus eſt modo corpus movendum. </s>
            <s xml:id="echoid-s1246" xml:space="preserve">Eodem modo Acus rotati-
              <lb/>
            lis Magneti aſſricta a vi directrice univerſali verſus ſuos in Terra
              <lb/>
            polos agitur, æque in hanc, ac in acum, Magnes in Experimento vi
              <lb/>
            attractrice agit, haud aliter ac in ſuperiori exemplo potentia ope
              <lb/>
            intermedii lori traheret acum in flumine; </s>
            <s xml:id="echoid-s1247" xml:space="preserve">cum hac vi directrice æ-
              <lb/>
            quilibrium ad varias diſtantias & </s>
            <s xml:id="echoid-s1248" xml:space="preserve">varias obliquas poſitiones acûs Ma-
              <lb/>
            gnes agit; </s>
            <s xml:id="echoid-s1249" xml:space="preserve">unde ex his experimentis non poteſt concludi, quanta vi
              <lb/>
            attrahuntur, per ſolam vim attractricem, duo Magnetes ad ſe, vel
              <lb/>
            Magnes ad Acum Ferrumque. </s>
            <s xml:id="echoid-s1250" xml:space="preserve">Non tamen hæc Eperimenta ſuâ ca-
              <lb/>
            rent utilitate, quippe, ſuppoſita Acu abſque attritu poſſe ſupra cardi-
              <lb/>
            nem converti, evincunt vim attractricem Magnetis agere in vim di-
              <lb/>
            rectricem ad certas diſtantias ſecundum ſuperius indicatas rationes: </s>
            <s xml:id="echoid-s1251" xml:space="preserve">& </s>
            <s xml:id="echoid-s1252" xml:space="preserve">
              <lb/>
            cognita vi attrahente Magnetis, indagari poteſt quantitas virtutis
              <lb/>
            directricis ad quamcunque obliquitatem acus ex regulis Mechanices:
              <lb/>
            </s>
            <s xml:id="echoid-s1253" xml:space="preserve">Sit enim acus Tab. </s>
            <s xml:id="echoid-s1254" xml:space="preserve">5. </s>
            <s xml:id="echoid-s1255" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s1256" xml:space="preserve">6. </s>
            <s xml:id="echoid-s1257" xml:space="preserve">ACB, cujus axis in C, quæ vi directrice agen-
              <lb/>
            tejuxta B C A teneatur in eadem determinatione, trahatur acus per
              <lb/>
            vim D, in ſitum obliquum a C b, ita tamen, ut angulus C a b ſit re-
              <lb/>
            ctus: </s>
            <s xml:id="echoid-s1258" xml:space="preserve">ducatur quæcunquerecta E a parallela ad A C B, quæ vim directri-
              <lb/>
            cem indicat, tum perpendicularis E C in aC; </s>
            <s xml:id="echoid-s1259" xml:space="preserve">concipiaturque reſolvi vis
              <lb/>
            directrix in unam perpendicularem ad acum, quæ eſt E C, & </s>
            <s xml:id="echoid-s1260" xml:space="preserve">in aliam
              <lb/>
            a C, erit E C directe oppoſita ipſi a D directioni potentiæ D, atque tria
              <lb/>
            latera T rianguli E a C ſuis magnitudinibus expriment vires, quæ hic
              <lb/>
            adſunt: </s>
            <s xml:id="echoid-s1261" xml:space="preserve">C E notabit vim potentiæ trahentis D. </s>
            <s xml:id="echoid-s1262" xml:space="preserve">E a ſive A C totam
              <lb/>
            vim directricem, & </s>
            <s xml:id="echoid-s1263" xml:space="preserve">a c partem virium directricium remanentium: </s>
            <s xml:id="echoid-s1264" xml:space="preserve">
              <lb/>
            cognita igitur longitudine Acus a c, tum angulo E C a, & </s>
            <s xml:id="echoid-s1265" xml:space="preserve">quantita-
              <lb/>
            te virium attractricium ſive E C, invenitur E a ſive A C, hoc eſt
              <lb/>
            quantitas virtutis directricis.</s>
            <s xml:id="echoid-s1266" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1267" xml:space="preserve">quando mecum pervolvebam vim univerſalem directricem Ma-
              <lb/>
            gneticam, qua dirigitur & </s>
            <s xml:id="echoid-s1268" xml:space="preserve">deprimitur Verſorium infra horizon-
              <lb/>
            tis paralleliſmum in his Europæ regionibus, uti poſtea liquebit </s>
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