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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              <pb o="359" file="0373" n="373" rhead="DE MAGNITUDINE TERRÆ."/>
            gens Terrarum ullibi inſtituit, potuitve; </s>
            <s xml:id="echoid-s8689" xml:space="preserve">non enim datur ullibi
              <lb/>
            campus adeo æquatus, nullum littus tam planum, quin plurimis
              <lb/>
            aſperitatibus donetur, quarum cavitates catena decempedatoris
              <lb/>
            ingreditur, nec ope longorum baculorum evitatur error, quem
              <lb/>
            ſoli inæqualitas affert; </s>
            <s xml:id="echoid-s8690" xml:space="preserve">ſola glacies ſuperficiem æquam, accura-
              <lb/>
            tiſſime menſurandam, habet: </s>
            <s xml:id="echoid-s8691" xml:space="preserve">hanc igitur opportunitatem non ne-
              <lb/>
            glexit Snellius, atque intervallum aliquod inter pagum Voorſcho-
              <lb/>
            ten & </s>
            <s xml:id="echoid-s8692" xml:space="preserve">domum Douſianam aſſumens ſuper glacie, id accuratiſſime
              <lb/>
            menſuravit, imo ut tutius confidere poſſet, ter menſuram re-
              <lb/>
            petiit, deinde Quadrantis ope angulos obſervavit, quos Turris
              <lb/>
            Leydenſis cum aſſumta linea ad utrumque extremum compone-
              <lb/>
            bat; </s>
            <s xml:id="echoid-s8693" xml:space="preserve">idemque repetens adſpiciendo Turrim pagi Soeterwoudæ,
              <lb/>
            ex Trigonometria determinavit diſtantiam inter utramque Turrim
              <lb/>
            1097 perticarum, 1 pedis & </s>
            <s xml:id="echoid-s8694" xml:space="preserve">{17/100} pollicis. </s>
            <s xml:id="echoid-s8695" xml:space="preserve">cum antea eam modo
              <lb/>
            poſuerat 1092. </s>
            <s xml:id="echoid-s8696" xml:space="preserve">perticarum, 3 pedum, 3 pollicum. </s>
            <s xml:id="echoid-s8697" xml:space="preserve">Ultimam men-
              <lb/>
            ſuram omnino prætulit omnibus aliis, utpote ſupra glaciem politiſ-
              <lb/>
            ſimam ſummâ cum curâ captam. </s>
            <s xml:id="echoid-s8698" xml:space="preserve">Antea angulos omnium Trian-
              <lb/>
            gulorum correxerat, nunc baſin omnium longitudinum emendabat;
              <lb/>
            </s>
            <s xml:id="echoid-s8699" xml:space="preserve">adeoque iterum ab initio calculus omnium Triangulorum erat re-
              <lb/>
            petendus: </s>
            <s xml:id="echoid-s8700" xml:space="preserve">pertæſus procul dubio laboris, quo jam bis perfun-
              <lb/>
            ctus erat Auctor, tantum adnotavit, ultimæ modo menſuræ fi-
              <lb/>
            dendum eſſe, non primæ, quam in Eratoſthene ſtatuit, atque
              <lb/>
            ulterius fecit nihil: </s>
            <s xml:id="echoid-s8701" xml:space="preserve">abſolviſſet procul dubio calculum, ſi cano-
              <lb/>
            nes Logarithmorum habuiſſet, quos hac tempeſtate poſſidemus,
              <lb/>
            & </s>
            <s xml:id="echoid-s8702" xml:space="preserve">quorum beneficio facillime & </s>
            <s xml:id="echoid-s8703" xml:space="preserve">breviſſime præſtamus, quod
              <lb/>
            veteres non niſi tædioſiſſimis multiplicationibus & </s>
            <s xml:id="echoid-s8704" xml:space="preserve">diviſionibus
              <lb/>
            maximorum numerorum peragebant, quibus non raro in errores
              <lb/>
            incidebant, â quibus Snellius immunis non fuit, deprehendi e-
              <lb/>
            nim illum uſum fuiſſe canonibus Sinuum & </s>
            <s xml:id="echoid-s8705" xml:space="preserve">Tangentium haud
              <lb/>
            accuratis, & </s>
            <s xml:id="echoid-s8706" xml:space="preserve">præterea propter longiſſimas Arithmeticas opera-
              <lb/>
            tiones commiſſiſſe alios errores, adeo ut ipſius calculo ſive
              <lb/>
            primo, ſive poſtea inſtituto non ſemper conſidi poſſit: </s>
            <s xml:id="echoid-s8707" xml:space="preserve">hinc
              <lb/>
            Galliarum Mathematici, qui Anno 1718 in lucem miſerunt men-
              <lb/>
            ſuram Terræ, merito in Snellium animadvertunt; </s>
            <s xml:id="echoid-s8708" xml:space="preserve">oſtendit-
              <lb/>
            que Cl. </s>
            <s xml:id="echoid-s8709" xml:space="preserve">Caſſini in L’Hiſt. </s>
            <s xml:id="echoid-s8710" xml:space="preserve">de L’Acad. </s>
            <s xml:id="echoid-s8711" xml:space="preserve">Roy: </s>
            <s xml:id="echoid-s8712" xml:space="preserve">A°. </s>
            <s xml:id="echoid-s8713" xml:space="preserve">1702, ex diſtantia
              <lb/>
            inter Alcmariam & </s>
            <s xml:id="echoid-s8714" xml:space="preserve">Rotterodamum ſecundum Snellianam </s>
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