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-s767" xml:space="preserve">
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            agunt, & </s>
            <s xml:id="echoid-s768" xml:space="preserve">hinc vires exeuntes forte ex ambobus, ſibique obviam
              <lb/>
            euntes, proportionem turbare poſſent: </s>
            <s xml:id="echoid-s769" xml:space="preserve">qua propter ſi haberem Mag-
              <lb/>
            netem unum activum, & </s>
            <s xml:id="echoid-s770" xml:space="preserve">alium ſpoliatum omnibus viribus, mihi
              <lb/>
            ſpes quædam affulgebat detegendi melius virium proportionem, ve-
              <lb/>
            rum ejusmodi Magnes iners eſſe tantum poterat ferrum purum bo-
              <lb/>
            numque, recenter ex Igne extractum, quod nequaquam ulla vi Mag-
              <lb/>
            netica foret imbutum, non arreptum aut percuſſum forcipe ferreo, ſed
              <lb/>
            leniter & </s>
            <s xml:id="echoid-s771" xml:space="preserve">prudenter tractatum, ideoque me converti ad Experimenta
              <lb/>
            cum Magnete & </s>
            <s xml:id="echoid-s772" xml:space="preserve">ferro facienda, quæ in Capite deſcribam ſequente.</s>
            <s xml:id="echoid-s773" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s774" xml:space="preserve">Fui in hiſce Experimentis inſtituendis deſcribendisque ad tædium
              <lb/>
            usque prolixus, ſed non abſque ratione; </s>
            <s xml:id="echoid-s775" xml:space="preserve">fieri enim potuiſſet, ut in
              <lb/>
            uno deciperer, errorem autem agnoſcerem in altero: </s>
            <s xml:id="echoid-s776" xml:space="preserve">præterea quia
              <lb/>
            virium Magneticarum proportionem aliam aſſumſit Philoſophorum,
              <lb/>
            qui unquam extiterunt, princeps Iſacus Newtonus, non oportebat,
              <lb/>
            ut perfunctorie hoc negotium tractarem, paucisque contentus eſſem
              <lb/>
            Experimentis: </s>
            <s xml:id="echoid-s777" xml:space="preserve">Dixerat enim vir nunquam ſatis laudatus in Prine.
              <lb/>
            </s>
            <s xml:id="echoid-s778" xml:space="preserve">Philoſ. </s>
            <s xml:id="echoid-s779" xml:space="preserve">Lib. </s>
            <s xml:id="echoid-s780" xml:space="preserve">1. </s>
            <s xml:id="echoid-s781" xml:space="preserve">Sect. </s>
            <s xml:id="echoid-s782" xml:space="preserve">13. </s>
            <s xml:id="echoid-s783" xml:space="preserve">prop. </s>
            <s xml:id="echoid-s784" xml:space="preserve">85. </s>
            <s xml:id="echoid-s785" xml:space="preserve">Si corporis attracti, ubi attra-
              <lb/>
            benti contiguum eſt, attractio longe fortior ſit, quam cum vel mi-
              <lb/>
            nimo intervallo ſeparatur ab invicem, vires particularum trabentis,
              <lb/>
            in receſſu corporis attracti, decreſcere in ratione plusquam duplicata
              <lb/>
            diſtantiarum a particulis: </s>
            <s xml:id="echoid-s786" xml:space="preserve">præterea in Lib. </s>
            <s xml:id="echoid-s787" xml:space="preserve">3. </s>
            <s xml:id="echoid-s788" xml:space="preserve">prop. </s>
            <s xml:id="echoid-s789" xml:space="preserve">6. </s>
            <s xml:id="echoid-s790" xml:space="preserve">Corol. </s>
            <s xml:id="echoid-s791" xml:space="preserve">5. </s>
            <s xml:id="echoid-s792" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s793" xml:space="preserve">
              <lb/>
            368. </s>
            <s xml:id="echoid-s794" xml:space="preserve">Hæc habet: </s>
            <s xml:id="echoid-s795" xml:space="preserve">vis gravit at is diverſi eſt generis a vi Magnetica,
              <lb/>
            nam attractio Magnetica non eſt ut materia attracta. </s>
            <s xml:id="echoid-s796" xml:space="preserve">Corpora ali-
              <lb/>
            qua magis trabuntur, alia minus, plurima non trabuntur. </s>
            <s xml:id="echoid-s797" xml:space="preserve">Et vis
              <lb/>
            Magnetica in uno & </s>
            <s xml:id="echoid-s798" xml:space="preserve">eodem corpore intendi poteſt & </s>
            <s xml:id="echoid-s799" xml:space="preserve">remitti, eſtque
              <lb/>
            nonnunquam longe major pro quantitate materiæ, quam vis gravi-
              <lb/>
            tatis, & </s>
            <s xml:id="echoid-s800" xml:space="preserve">in receſſu a Magnete decreſcit in ratione diſtantiæ non du-
              <lb/>
            plicata, ſed fere triplicata, quantum ex craſſis quibusdam obſerva-
              <lb/>
            tionibus animadvertere potui. </s>
            <s xml:id="echoid-s801" xml:space="preserve">Utinam memoriæ prodita fuiſſent Ex-
              <lb/>
            perimenta, ex quibus Newtonus hæc collegit! forſitan enim Vir ſtu-
              <lb/>
            pendæ ſubtilitatis in Mathematicis diſciplinis methodum invenit ſepa-
              <lb/>
            randi attractiones a repulſionibus, quarum proportionem in diſtan-
              <lb/>
            tiæ ratione triplicata decreſcere deprehendit; </s>
            <s xml:id="echoid-s802" xml:space="preserve">ſed quia nihil de hac
              <lb/>
            re ulterius determinavit, nec rejicere, nec amplecti ejus ſententiam
              <lb/>
            poſſumus; </s>
            <s xml:id="echoid-s803" xml:space="preserve">ſi autem modo Experimenta noſtra conſulamus, tum vi-
              <lb/>
            res Magnetis attrahentes non in tam alta ratione diſtantiarum decreſ-
              <lb/>
            cere concluderemus.</s>
            <s xml:id="echoid-s804" xml:space="preserve"/>
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