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 Notes

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              <pb o="679" file="0695" n="696" rhead="ULTRAJECTINÆ ANN. MDCCXXVIII."/>
            unquam conſpexi, radii lucidi & </s>
            <s xml:id="echoid-s17193" xml:space="preserve">valde micantes ex horizonte egredi
              <lb/>
            videbantur, qui tamen nunquam aſſurrexerunt ultra 45 gradus, cito
              <lb/>
            evanidi, nec ultra minutum perdurantes: </s>
            <s xml:id="echoid-s17194" xml:space="preserve">erat hoc lumen adeo
              <lb/>
            tenue, ut Lucem ſtellarum fixarum tertiæ magnitudinis tranſmit-
              <lb/>
            tens non confuderit: </s>
            <s xml:id="echoid-s17195" xml:space="preserve">cælum undique erat ſerenum, plagâ Boreâ
              <lb/>
            excepta: </s>
            <s xml:id="echoid-s17196" xml:space="preserve">omnia objecta in Terræ ſuperficie fere æque clare con-
              <lb/>
            ſpiciebantur, ac in Lunæ Quadratura fieri ſolet.</s>
            <s xml:id="echoid-s17197" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17198" xml:space="preserve">Duodecimo Octobris Aurora Borealis oborta fuit, quo tempo-
              <lb/>
            re Conſtellationibus Boreis in ſpecula demonſtrandis occupa-
              <lb/>
            bar: </s>
            <s xml:id="echoid-s17199" xml:space="preserve">oriebatur horâ 10, 35. </s>
            <s xml:id="echoid-s17200" xml:space="preserve">ceſſavit penitus hora 10 minu-
              <lb/>
            tis 50: </s>
            <s xml:id="echoid-s17201" xml:space="preserve">erat in plagâ Cæli Boreâ nubium atrarum congeries,
              <lb/>
            non tamen ultra 10 gradibus ſupra horizontem elevatarum; </s>
            <s xml:id="echoid-s17202" xml:space="preserve">ex
              <lb/>
            harum ſuperficie ſuperiori emittebantur radii luminoſi Zenith ver-
              <lb/>
            ſus recta adſcendentes, arctiſſimi, quâ parte nubi adhærebant, ſed
              <lb/>
            latius explicati Zenith verſus eundo, in ipſo ortu ex nube fulgen-
              <lb/>
            tiſſimi, ſed in progreſſu rariores minufque lucidi, non autem ad-
              <lb/>
            ſcenderunt ultra 25 gradus ſupra horizontem; </s>
            <s xml:id="echoid-s17203" xml:space="preserve">radii ultra minutum
              <lb/>
            non perſtabant; </s>
            <s xml:id="echoid-s17204" xml:space="preserve">aliquando etiam latius explicabantur in ipſa nube,
              <lb/>
            tum tamen non adeo fulgebant, ac qui emittebantur: </s>
            <s xml:id="echoid-s17205" xml:space="preserve">nubes hæc lu-
              <lb/>
            minoſa a ſeptentrione ortum & </s>
            <s xml:id="echoid-s17206" xml:space="preserve">occaſum verſus 8 gradibus circiter
              <lb/>
            ſe explicabat; </s>
            <s xml:id="echoid-s17207" xml:space="preserve">ventusqne ſpirabat placidus Euro-Boreus.</s>
            <s xml:id="echoid-s17208" xml:space="preserve"/>
          </p>
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            <s xml:id="echoid-s17209" xml:space="preserve">Novembris ſecundo, ut & </s>
            <s xml:id="echoid-s17210" xml:space="preserve">vigeſimo tertio in plaga cæli Borea
              <lb/>
            nubes luminoſa erat, donata lumine æquabili, & </s>
            <s xml:id="echoid-s17211" xml:space="preserve">parum fulgente,
              <lb/>
            ex nube non emittebantur radii, quemadmodum in aliis Auroris Bo-
              <lb/>
            realibus fieri conſuevit, perdurabant aliquot horis, verum nec finem,
              <lb/>
            nec initium phænomeni obſervavi.</s>
            <s xml:id="echoid-s17212" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17213" xml:space="preserve">Reliquæ Auroræ Boreales nihil ſingulare, quam quod ſæpius ab
              <lb/>
            aliis notatum fuit, conſpiciendum præbuerunt.</s>
            <s xml:id="echoid-s17214" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17215" xml:space="preserve">Sunt hæc præcipua meteora Anno 1728 obſervata, plura ex ipſis
              <lb/>
            Ephemeridibus colligi poſſunt.</s>
            <s xml:id="echoid-s17216" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s17217" xml:space="preserve">Admodum neceſſe eſt, ut quædam de Thermoſcopio, quo uſusfui,
              <lb/>
            addam: </s>
            <s xml:id="echoid-s17218" xml:space="preserve">bulbus conoideus, gracili adhærens tubo, impletus eſt liquore
              <lb/>
            cæruleo, veluti Florentinum impleri rubro ſpiritu ſolebat: </s>
            <s xml:id="echoid-s17219" xml:space="preserve">Scala divi-
              <lb/>
            ſionishæc eſt: </s>
            <s xml:id="echoid-s17220" xml:space="preserve">Thermoſcopium immiſſum calido & </s>
            <s xml:id="echoid-s17221" xml:space="preserve">erumpentiè vivo
              <lb/>
            animali ſanguini, liquorem gerit certo modo rarefactum, ubi ponitur
              <lb/>
            nota 96, ſed idemliquor deſcendit ad aliam notam, 32, ſimulac </s>
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