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-s4538" xml:space="preserve">
              <pb o="195" file="0209" n="209" rhead="DE MAGNETE."/>
            73°, 45?</s>
            <s xml:id="echoid-s4539" xml:space="preserve">. Sed his omnibus ſides haberi nequit, niſi longitudo
              <lb/>
            Acus, quæ Experimento inſerviit adnotaretur; </s>
            <s xml:id="echoid-s4540" xml:space="preserve">cæteroquin ex hiſ-
              <lb/>
            ce obſervationibus colligi poſſet, a tempore Normanni uſque ad
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            hodiernum Inclinationem Acus increviſſe; </s>
            <s xml:id="echoid-s4541" xml:space="preserve">antequam tamen hoc
              <lb/>
            verum eſſe aſſeratur, in eodem Terræloco cum eadem Acu per pluri-
              <lb/>
            mos annos obſervationes capiendæ adhuc erunt: </s>
            <s xml:id="echoid-s4542" xml:space="preserve">Inclinationem autem
              <lb/>
            ſingulis mutari annis probabile reddit Declinationum mutatio, ſed
              <lb/>
            præſtat exſpectare, & </s>
            <s xml:id="echoid-s4543" xml:space="preserve">videre quomodo ipſa Natura operetur, obſer-
              <lb/>
            vationes enim ſibi oppoſitas, tam quæ Inclinationem increſcere,
              <lb/>
            quam decreſcere tempore monſtrarent, poſſidemus. </s>
            <s xml:id="echoid-s4544" xml:space="preserve">Nam Feuilleè
              <lb/>
            in urbe Americæ Coquimbo memoravit Inclinationem fuiſſe graduum
              <lb/>
            47 & </s>
            <s xml:id="echoid-s4545" xml:space="preserve">20 Minutorum, & </s>
            <s xml:id="echoid-s4546" xml:space="preserve">aliquantum poſt fuiſſe ibidem 47°, 30?</s>
            <s xml:id="echoid-s4547" xml:space="preserve">. ad-
              <lb/>
            eoque increviſſet Inclinatio, verum Grahamus ope ſuæ accuratiſſi-
              <lb/>
            mæ Acus Anno 1723, Martii 29. </s>
            <s xml:id="echoid-s4548" xml:space="preserve">Inclinationem notavit 75°, aut
              <lb/>
            74°, 53?</s>
            <s xml:id="echoid-s4549" xml:space="preserve">. & </s>
            <s xml:id="echoid-s4550" xml:space="preserve">27. </s>
            <s xml:id="echoid-s4551" xml:space="preserve">Maji 74°, 50?</s>
            <s xml:id="echoid-s4552" xml:space="preserve">. adeoque decreviſſet intermedio
              <lb/>
            tempore; </s>
            <s xml:id="echoid-s4553" xml:space="preserve">hanc poſteritas litem dirimet, uſura obſervationibus, quas
              <lb/>
            diligentes accuratique hujus & </s>
            <s xml:id="echoid-s4554" xml:space="preserve">ſequentium ſeculorum Phyſicæ cul-
              <lb/>
            tores accumulabunt.</s>
            <s xml:id="echoid-s4555" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4556" xml:space="preserve">Poſtquam cognoveram Acus variæ longitudinis diverſimode in-
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            clinare, intelligere incepi obſervationes, quas Noëllius, Poundiuſ-
              <lb/>
            que per Mare Æthyopicum & </s>
            <s xml:id="echoid-s4557" xml:space="preserve">Indicum navigantes, inſtituerunt,
              <lb/>
            eas enim inter ſe comparans, tantam deprehendi differentiam, ut
              <lb/>
            conciliare ſecum invicem nequaquam potuerim; </s>
            <s xml:id="echoid-s4558" xml:space="preserve">fuerunt nempe hi
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            obſervatores uſi variæ longitudinis Acu, & </s>
            <s xml:id="echoid-s4559" xml:space="preserve">plus minuſve accurate
              <lb/>
            elaboratâ: </s>
            <s xml:id="echoid-s4560" xml:space="preserve">Quanta enim non intercedit differentia inter Inclinatio-
              <lb/>
            nes noſtrarum Acuum, unâ inclinante 72 gradibus, alterâ tantum
              <lb/>
            60? </s>
            <s xml:id="echoid-s4561" xml:space="preserve">quare non poteſt non ſumma obſervari Inclinationum diſcre-
              <lb/>
            pantia a variis Autoribus, uſis Acubus diverſis.</s>
            <s xml:id="echoid-s4562" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div125" type="section" level="1" n="125">
          <head xml:id="echoid-head134" xml:space="preserve">EXPERIMENTUM CI.</head>
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            <s xml:id="echoid-s4563" xml:space="preserve">Auſtrali Extremitati Acus Inclinatoriæ 4 pedum impoſitum fuit
              <lb/>
            pondus 1 {1/2} grani, quo rediit in ſitum horizontalem; </s>
            <s xml:id="echoid-s4564" xml:space="preserve">tota hujus A-
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            cus gravitas eſt 6105 granorum. </s>
            <s xml:id="echoid-s4565" xml:space="preserve">Hoc etiam obſervavit Whiſtonus,
              <lb/>
            Acus enim 4 pedum, quæ Londini 75 gradibus 10 Minutis incli-
              <lb/>
            nabat, erat ponderis 4012 {3/8} granorum, hæc in æquilibrium, ſive
              <lb/>
            horizontalem ſitum redibat appenſo 1 {1/3} grano: </s>
            <s xml:id="echoid-s4566" xml:space="preserve">alia Acus </s>
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