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

Table of contents

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[81.] EXPERIMENTUM LXI.
Page: 131 (117)
[82.] EXPERIMENTUM LXII.
Page: 131 (117)
[83.] EXPERIMENTUM. LXIII.
Page: 131 (117)
[84.] EXPERIMENTUM LXIV.
Page: 132 (118)
[85.] EXPERIMENTUM LXV.
Page: 132 (118)
[86.] EXPERIMENTUM LXVI.
Page: 134 (120)
[87.] EXPERIMENTUM LXVII.
Page: 135 (121)
[88.] EXPERIMENTUM LXVIII.
Page: 136 (122)
[89.] EXPERIMENTUM LXIX.
Page: 136 (122)
[90.] EXPERIMENTUM LXX.
Page: 137 (123)
[91.] EXPERIMENTUM LXXI.
Page: 137 (123)
[92.] EXPERIMENTUM LXXII.
Page: 137 (123)
[93.] EXPERIMENTUM LXXIII.
Page: 141 (127)
[94.] DE METHODO ARMANDI MAGNETES.
Page: 144 (130)
[95.] EXPERIMENTUM LXXIV.
Page: 146 (132)
[96.] EXPERIMENTUM. LXXV.
Page: 147 (133)
[97.] EXPERIMENTUM LXXVI.
Page: 147 (133)
[98.] EXPERIMENTUM LXXVII.
Page: 148 (134)
[99.] EXPERIMENTUM LXXVIII.
Page: 148 (134)
[100.] EXPERIMENTUM. LXXIX.
Page: 148 (134)
[101.] EXPERIMENTUM LXXX.
Page: 149 (135)
[102.] CAPUT TERTIUM. De Directione Magnetis & Ferri ſuper ipſo ducti.
Page: 150 (136)
[103.] EXPERIMENTUM LXXXI.
Page: 151 (137)
[104.] EXPERIMENTUM LXXXII.
Page: 152 (138)
[105.] EXPERIMENTUM LXXXIII.
Page: 153 (139)
[106.] EXPERIMENTUM LXXXIV.
Page: 154 (140)
[107.] EXPERIMENTUM LXXXV.
Page: 154 (140)
[108.] EXPERIMENTUM LXXXVI.
Page: 155 (141)
[109.] EXPERIMENTUM LXXXVII.
Page: 155 (141)
[110.] EXPERIMENTUM LXXXVIII.
Page: 155 (141)
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            nor pendere diſcrepantiam inter obſervatas Inclinationes in iiſdem
              <lb/>
            Terræ locis ſummam, etiamſi parvum temporis intervallum inter-
              <lb/>
            ceſſerit, uti conſtare poteſt ex obſervationibus Noëllii & </s>
            <s xml:id="echoid-s4467" xml:space="preserve">Poundii,
              <lb/>
            inferius commemorandis: </s>
            <s xml:id="echoid-s4468" xml:space="preserve">Acus alias breviores & </s>
            <s xml:id="echoid-s4469" xml:space="preserve">tenuiores quoque
              <lb/>
            conſtruxi, quarum una exhibetur R R, cujus axis æneus erat P P,
              <lb/>
            brachia P R, P R; </s>
            <s xml:id="echoid-s4470" xml:space="preserve">hujuſmodi acus præ gravitate ſuperabat Chalybis
              <lb/>
            rigiditatem, ita ut R R, non manſerit linea abſolute recta, poſt-
              <lb/>
            quam axis P P capitulis impoſitus fuerat, ſed parum in formam ar-
              <lb/>
            cus incurvabatur, minus tamen, quam ut ope oculi, vel regulæ ob-
              <lb/>
            ſervari potuerit; </s>
            <s xml:id="echoid-s4471" xml:space="preserve">centrum gravitatis igitur parum deſcendit infra
              <lb/>
            axin, vel centrum motus P P. </s>
            <s xml:id="echoid-s4472" xml:space="preserve">cum hujuſmodi acus in obliquo ad
              <lb/>
            horizontem poſita ſitu non valebat ad menſurandam Magnetis Incli-
              <lb/>
            nationem, corpuſculum cupreum Q, vix eminens ſupra acum, ta-
              <lb/>
            men ſatis ponderoſum, impoſitum fuit tum medio acûs, tum axeos,
              <lb/>
            quo centrum gravitatis adſcendens, redibat ad medium axeos, & </s>
            <s xml:id="echoid-s4473" xml:space="preserve">
              <lb/>
            acus utcunque perficiebatur, nontamen exactiſſime, pro omni ſi-
              <lb/>
            tu, nam incurvatio maxima eſt poſita acu in ſitu horizontali, & </s>
            <s xml:id="echoid-s4474" xml:space="preserve">
              <lb/>
            minor in quocunque ſitu obliquo, minima in perpendiculari, ut
              <lb/>
            ex natura vectis facile intelligitur, huic defectui tamen obviam ivi-
              <lb/>
            mus annulis æneis tenuiſſimis ſupra brachia P R mobilibus, locan-
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            diſque in variis punctis: </s>
            <s xml:id="echoid-s4475" xml:space="preserve">multo autem melius eſt virgas denſas rigi-
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            daſque ſumſiſſe, quæ non inflectantur: </s>
            <s xml:id="echoid-s4476" xml:space="preserve">His præmiſſis ad experimen-
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            ta cum deſcriptis capta acubus pergamus.</s>
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          <head xml:id="echoid-head132" xml:space="preserve">EXPERIMENTUM XCIX.</head>
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            <s xml:id="echoid-s4478" xml:space="preserve">Tabula AAA. </s>
            <s xml:id="echoid-s4479" xml:space="preserve">primum ita locata fuit, ut ſtaret in eodem plano
              <lb/>
            verticali, quod Verſorium horizontale & </s>
            <s xml:id="echoid-s4480" xml:space="preserve">vulgare determinabat;
              <lb/>
            </s>
            <s xml:id="echoid-s4481" xml:space="preserve">tum Acus 4 pedum Inclinatoria ducta fuit ſupra polum Boreum Ma-
              <lb/>
            gnetis armati, ſecundum totam ſuam longitudinem, poſtquam vi
              <lb/>
            Magnetis imprægnata fuit, impoſita eſt excipulis M N in ſitu hori-
              <lb/>
            zontali; </s>
            <s xml:id="echoid-s4482" xml:space="preserve">illico cuſpis Boream ſpectans deprimebatur, atque ultra
              <lb/>
            perpendiculum D C eundo, rediit ſurſum, oſcillationes plurimas
              <lb/>
            penduli inſtar abſolvens, donec tandem quievit, tum vero inclina-
              <lb/>
            vit ſub horizonte Anno 1728. </s>
            <s xml:id="echoid-s4483" xml:space="preserve">Martii 23. </s>
            <s xml:id="echoid-s4484" xml:space="preserve">Trajecti Batavorum gra-
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            dibus 67. </s>
            <s xml:id="echoid-s4485" xml:space="preserve">Sæpius autem ex hoc ſitu turbata, ut obſervarem an con-
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            ſtans foret Inclinatio, Acus rediit ad gradus 67, aliquando </s>
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