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-s465" xml:space="preserve">
              <pb o="15" file="0029" n="29" rhead="DEMAGNETE."/>
            Magnetem H diſtantias ab N, a quo cum attrahebatur, deprime-
              <lb/>
            batur, pereunte ita æquilibrio cum pondere lancis F; </s>
            <s xml:id="echoid-s466" xml:space="preserve">ſed id facile
              <lb/>
            reſtituebatur novis leviter & </s>
            <s xml:id="echoid-s467" xml:space="preserve">abſque concuſſione injectis ponduſculis,
              <lb/>
            quæ demonſtrabant, quantæ erant vires Magnetum in ſe in illis in-
              <lb/>
            tervallis: </s>
            <s xml:id="echoid-s468" xml:space="preserve">Diſtantiæ majores ope circini mere ænei menſurabantur,
              <lb/>
            in quibus hoc modo vires attractrices facile eruebam, ſed pergens
              <lb/>
            ad eas quoque in minoribus intervallis adnotandas, nimis difficile
              <lb/>
            obſervatu erat punctum æquilibrii, cum pondere F nondum ſatis
              <lb/>
            gravi, Magnes H propius accedebat ad N, pondere autem injecto
              <lb/>
            paulum graviori, nimium attollebatur Magnes H: </s>
            <s xml:id="echoid-s469" xml:space="preserve">huic incommodo
              <lb/>
            obviam ivi ſumendo lamellas æneas L L, vel in Fig 3. </s>
            <s xml:id="echoid-s470" xml:space="preserve">S. </s>
            <s xml:id="echoid-s471" xml:space="preserve">S. </s>
            <s xml:id="echoid-s472" xml:space="preserve">S,
              <lb/>
            quarum latitudo inter ſe diſcrepabat {1/12} pollicis, ejusmodi 12 præpa-
              <lb/>
            ravi, deinde alias quarum craſſities erat {1/24} tum {1/36}, & </s>
            <s xml:id="echoid-s473" xml:space="preserve">{1/48} pollicis: </s>
            <s xml:id="echoid-s474" xml:space="preserve">Impo-
              <lb/>
            ſita igitur aliqua lamella LL polo Magnetis NO, firmatoque in crena
              <lb/>
            capitis lignei K, demiſſus fuit Magnes ſuperior, donec lamellam ſuo
              <lb/>
            attingebat polo, atque examinis apex relpondebat pinnullæ V, quo
              <lb/>
            modo verum Magnetum intervallum dabatur, tum injecta fuerunt
              <lb/>
            Lanci F ponduscula, quæ erant grana Medica, donec vi At-
              <lb/>
            tractrice ſuperata Magnes H elevabatur: </s>
            <s xml:id="echoid-s475" xml:space="preserve">ne fallerer, bis ſemper re-
              <lb/>
            petii tentamen, prudentiſſime lanci immittendo & </s>
            <s xml:id="echoid-s476" xml:space="preserve">ſingulatim pon-
              <lb/>
            duſcula, quod ſi enim ex majori altitudine aliquod in eam incide-
              <lb/>
            rit, aut duo ſimul, avellitur Magnes H citius quam oportebat, ne-
              <lb/>
            que vera attractio in data diſtantia obtinetur: </s>
            <s xml:id="echoid-s477" xml:space="preserve">Inſuper dies elegi,
              <lb/>
            quibus experimenta capiebam, ſerenos, ſilentibus ventis; </s>
            <s xml:id="echoid-s478" xml:space="preserve">quoties-
              <lb/>
            cunque enim ventis agitatur Atmosphæra aëria, nunquam mobiliſſi-
              <lb/>
            ma noſtra Libra quieſcit, neque æquilibrium obſervari poteſt, etiam-
              <lb/>
            ſi in camera undique clauſa ſuſpendatur, Aer enim externus ſemper
              <lb/>
            cum eo, internas ædium partes occupante, communicat motum.</s>
            <s xml:id="echoid-s479" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s480" xml:space="preserve">Tum ne aliquid omitterem, quod forſitan Experimento mutatio-
              <lb/>
            nem inferret, notavi diem Anni, altitudinem Baroſcopii, & </s>
            <s xml:id="echoid-s481" xml:space="preserve">Thermo-
              <lb/>
            ſcopii, cælique ſiccitatem, atque venti plagam, quod non inutile
              <lb/>
            fuiſſe animadverti poſtea, ita enim detexi Vires eorundem Magne-
              <lb/>
            tum variare diverſo anni tempore, atque idcirco ejus ſemper in his
              <lb/>
            Experimentis habendam eſſe rationem.</s>
            <s xml:id="echoid-s482" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s483" xml:space="preserve">Prolixior quidem fui in memoranda methodo tentaminum noſtro-
              <lb/>
            rum, ſed inde colligi poteſt, an cum ea, quæ deſiderari poſſet, </s>
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