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="361" file="0375" n="375" rhead="DE MAGNITUDINE TERRÆ."/>
            ter repetita fuerit. </s>
            <s xml:id="echoid-s8744" xml:space="preserve">In hac parte proinde diſtantiæ deprehenduntur
              <lb/>
            locorum veræ, veraque magnitudo Gradus unius Terræ ſub noſtra
              <lb/>
            latitudine & </s>
            <s xml:id="echoid-s8745" xml:space="preserve">longitudine. </s>
            <s xml:id="echoid-s8746" xml:space="preserve">Dolendum eſt, cum ulterius menſuram
              <lb/>
            produxerat Geometra uſque ad Machliniam, veluti in Tab. </s>
            <s xml:id="echoid-s8747" xml:space="preserve">XVI.
              <lb/>
            </s>
            <s xml:id="echoid-s8748" xml:space="preserve">repræſentatur, eas obſervationes periiſſe; </s>
            <s xml:id="echoid-s8749" xml:space="preserve">non enim illas in emen-
              <lb/>
            dationibus reperio, unde præter merum Schema ab ipſo Autore de-
              <lb/>
            pictum, nihil exhibere potui: </s>
            <s xml:id="echoid-s8750" xml:space="preserve">addita præterea ſunt alia Triangula,
              <lb/>
            quibus nonnullorum locorum diſtantiæ, quarum præcipua neceſſitas,
              <lb/>
            confirmantur, ut eo certiores veritatis evadamus; </s>
            <s xml:id="echoid-s8751" xml:space="preserve">quod in Geo-
              <lb/>
            metria Practica non prorſus eſt inutile; </s>
            <s xml:id="echoid-s8752" xml:space="preserve">docet enim experientia,
              <lb/>
            quam facile a verâ aberremus menſura, niſi ſummâ curâ obſerva-
              <lb/>
            tiones inſtrumentorum ope peregerimus, atque ideo ſolutionem
              <lb/>
            Problematis practici variis tentati modis menſuræ magnam fidem
              <lb/>
            conciliare: </s>
            <s xml:id="echoid-s8753" xml:space="preserve">præterea nonnullos Triangulorum angulos ope accu-
              <lb/>
            rati Quadrantis, Teleſcopiisque ornati ipſe exploravi, ut eo cer-
              <lb/>
            tior evaderem, an menſura Snelliana bene, an negligentius inſtituta
              <lb/>
            fuiſſet; </s>
            <s xml:id="echoid-s8754" xml:space="preserve">deprehendi plurimos angulos accuratiſſime fuiſſe captos,
              <lb/>
            aliquos uno alterove minuto aberraſſe, quos ideo correxi, hoc oc-
              <lb/>
            cupatus negotio non potui non dexteritatem Snellii admirari, qui
              <lb/>
            videndo tantum per penullarum crenas, tam accurate angulos tur-
              <lb/>
            rium valde diſſitarum & </s>
            <s xml:id="echoid-s8755" xml:space="preserve">vix nudo oculo diſtinguendarum obſer-
              <lb/>
            vare potuit: </s>
            <s xml:id="echoid-s8756" xml:space="preserve">omnes angulos de novo non examinavi, id vitæ meæ
              <lb/>
            ratio non permiſit, neque id neceſſarium judicabam, quum labores
              <lb/>
            ſecundi & </s>
            <s xml:id="echoid-s8757" xml:space="preserve">tertii Snellianitam accurate cum veritate conſentiebant,
              <lb/>
            quotieſcunque eos ad examen iterum vocabam: </s>
            <s xml:id="echoid-s8758" xml:space="preserve">Hæc monenda ju-
              <lb/>
            dicavi, ut intelligeretur, quare bis eadem menſura Terræ de-
              <lb/>
            ſcripta habeatur, & </s>
            <s xml:id="echoid-s8759" xml:space="preserve">quidnam a Snellio, quid a nobis in hoc negotio
              <lb/>
            peractum ſit.</s>
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