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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          <p>
            <s xml:id="echoid-s6205" xml:space="preserve">
              <pb o="261" file="0275" n="275" rhead="DE MAGNETE."/>
            tem perpendiculariter erecta ſponte vi eâ donari; </s>
            <s xml:id="echoid-s6206" xml:space="preserve">craſſa tamen & </s>
            <s xml:id="echoid-s6207" xml:space="preserve">
              <lb/>
            brevia non niſi longinquitate temporis; </s>
            <s xml:id="echoid-s6208" xml:space="preserve">craſſa & </s>
            <s xml:id="echoid-s6209" xml:space="preserve">longa citius; </s>
            <s xml:id="echoid-s6210" xml:space="preserve">ſed
              <lb/>
            tenuia & </s>
            <s xml:id="echoid-s6211" xml:space="preserve">longa nequidem horæ minutum poſtulare, cape enim vir-
              <lb/>
            gam 6 pedes longam, diametri {1/5} pollicis, ad horizontem perpen-
              <lb/>
            diculariter tene, & </s>
            <s xml:id="echoid-s6212" xml:space="preserve">cuſpide inferiori polum Verſorii Auſtralem at-
              <lb/>
            trahet, fugabit Boreum: </s>
            <s xml:id="echoid-s6213" xml:space="preserve">cuſpide ſuperiori attrahet polum Boreum,
              <lb/>
            fugando Auſtralem: </s>
            <s xml:id="echoid-s6214" xml:space="preserve">ſtatim virgam inverte, & </s>
            <s xml:id="echoid-s6215" xml:space="preserve">intra Minutum ob-
              <lb/>
            ſervabis, cuſpidem inferiorem attracturam polum Verſorii Auſtra-
              <lb/>
            lem, quem modo ante reſpuerat, adeo ut poli in ejuſmodi Virga
              <lb/>
            ocyſſime mutentur: </s>
            <s xml:id="echoid-s6216" xml:space="preserve">Idem in Virga breviori, ſed ſimul multum te-
              <lb/>
            nuiori animadverti poteſt. </s>
            <s xml:id="echoid-s6217" xml:space="preserve">Horum nonnulla adnotavit quondam
              <lb/>
            Grimaldi in Tract. </s>
            <s xml:id="echoid-s6218" xml:space="preserve">de Lumine Prop. </s>
            <s xml:id="echoid-s6219" xml:space="preserve">6. </s>
            <s xml:id="echoid-s6220" xml:space="preserve">§. </s>
            <s xml:id="echoid-s6221" xml:space="preserve">51. </s>
            <s xml:id="echoid-s6222" xml:space="preserve">tum Boyle, Poli-
              <lb/>
            nierius in Exper. </s>
            <s xml:id="echoid-s6223" xml:space="preserve">Phyſiq. </s>
            <s xml:id="echoid-s6224" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s6225" xml:space="preserve">283. </s>
            <s xml:id="echoid-s6226" xml:space="preserve">& </s>
            <s xml:id="echoid-s6227" xml:space="preserve">nuperrime Reaumurius in
              <lb/>
            L’Hiſt. </s>
            <s xml:id="echoid-s6228" xml:space="preserve">de L’Acad. </s>
            <s xml:id="echoid-s6229" xml:space="preserve">Roy. </s>
            <s xml:id="echoid-s6230" xml:space="preserve">A°. </s>
            <s xml:id="echoid-s6231" xml:space="preserve">1723. </s>
            <s xml:id="echoid-s6232" xml:space="preserve">Addendum præterea eſt, dari
              <lb/>
            nonnunquam lamellas Chalybeas, quæ in aquâ perpendiculariter
              <lb/>
            ad horizontem extinctæ, acquirunt polos fixos, non mutabiles,
              <lb/>
            lamellis quomodocunque inverſis: </s>
            <s xml:id="echoid-s6233" xml:space="preserve">dantur quoque aliæ, quæ po-
              <lb/>
            los quidem fixos conſervant, verum inverſæ, non adeo vehemen-
              <lb/>
            ter vim ejuſdem poli exercent, quam antea, & </s>
            <s xml:id="echoid-s6234" xml:space="preserve">potius inclinatio-
              <lb/>
            nem tantum ejuſdem poli oſtendunt: </s>
            <s xml:id="echoid-s6235" xml:space="preserve">imo aliæ, poſtquam conver-
              <lb/>
            ſæ ſunt, evadunt indifferentes, ita ut nauticæ Acui admotæ, ver-
              <lb/>
            ſus Ortum & </s>
            <s xml:id="echoid-s6236" xml:space="preserve">Occaſum eam dirigant, atque in æquilibrio quaſi
              <lb/>
            teneant: </s>
            <s xml:id="echoid-s6237" xml:space="preserve">hæc autem omnia modo obtinent in tenuibus Chalybeis
              <lb/>
            lamellis; </s>
            <s xml:id="echoid-s6238" xml:space="preserve">nam in craſſioribus ferramentis ea, quæ ſuperius attuli,
              <lb/>
            tantum dantur, hujus obſervationis potiſſimam partem vide in Phi-
              <lb/>
            loſ. </s>
            <s xml:id="echoid-s6239" xml:space="preserve">Tranſ. </s>
            <s xml:id="echoid-s6240" xml:space="preserve">N°. </s>
            <s xml:id="echoid-s6241" xml:space="preserve">246.</s>
            <s xml:id="echoid-s6242" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6243" xml:space="preserve">Quod ſi ferramenta diu fixa ſteterint, quemadmodum cancelli
              <lb/>
            ferrei feneſtrarum, qui in ædibus antiquis per centenos hæſerunt
              <lb/>
            annos, hi vim maximam agendi in Acum Nauticam, imo ad di-
              <lb/>
            ſtantiam quidem 4 ulnarum & </s>
            <s xml:id="echoid-s6244" xml:space="preserve">amplius acquirunt, quemadmodum
              <lb/>
            Mantuæ obſervavit Cabeus Lib. </s>
            <s xml:id="echoid-s6245" xml:space="preserve">1. </s>
            <s xml:id="echoid-s6246" xml:space="preserve">Cap. </s>
            <s xml:id="echoid-s6247" xml:space="preserve">17.</s>
            <s xml:id="echoid-s6248" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6249" xml:space="preserve">Ex his experimentis iterum conſtat, ſemper Verſorium haberi
              <lb/>
            poſſe, quod cuſpides ſuas dirigat verſus plagam cæli Boream & </s>
            <s xml:id="echoid-s6250" xml:space="preserve">Au-
              <lb/>
            ſtralem, etiamſi non affricetur Magneti, modo ſtet aliquamdiu ver-
              <lb/>
            ticaliter erectum, aut ignitum immergatur aquæ perpendiculari-
              <lb/>
            œ
              <unsure/>
            r.</s>
            <s xml:id="echoid-s6251" xml:space="preserve"/>
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