Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 1: Opera mechanica

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            <s xml:id="echoid-s5493" xml:space="preserve">Pyxis plumbum, & </s>
            <s xml:id="echoid-s5494" xml:space="preserve">oleum continens eidem Cruci anne-
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            ctitur, ad latera, & </s>
            <s xml:id="echoid-s5495" xml:space="preserve">fundum incluſa; </s>
            <s xml:id="echoid-s5496" xml:space="preserve">ut autem ventus a Libel-
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            la arceatur, cava crux L planæ ligneæ cruci cum duobus
              <lb/>
            aut tribus hamis annectitur, adeo ut integra tum conficiatur
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            pyxis.</s>
            <s xml:id="echoid-s5497" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5498" xml:space="preserve">Ut uſui libella accommodetur, ac rectificetur, ut dictum
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            ſuſpenditur, plumbo non infernè annexo, & </s>
            <s xml:id="echoid-s5499" xml:space="preserve">in quoddam
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            diſtans objectum collineatur, attendendo ad punctum quod
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            Horizontale filum obtegit, filum enim diſtincte, ut obje-
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            ctum ipſum obſervari poteſt. </s>
            <s xml:id="echoid-s5500" xml:space="preserve">Deinde plumbum addatur, id
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            eſt annulo inferiori jungatur, ſi tum Horizontale filum eidem
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            objecti puncto reſpondeat, conſtabit crucis centrum gravita-
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            tis exacte dari in recta linea quæ duo ſuſpenſionis puncta
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            conjungit, id eſt quæ tranſit per puncta quibus fila brachiis
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            annectuntur. </s>
            <s xml:id="echoid-s5501" xml:space="preserve">Hæc eſt primaria requiſita præparatio: </s>
            <s xml:id="echoid-s5502" xml:space="preserve">verum
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            ſi hoc minime reperitur, res facilè perficitur ope annuli I,
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            obſervando, annulum vitrum objectivum verſus promoveri
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            debere, ſi Teleſcopium declinat, dum pondus annexum
              <lb/>
            eſt; </s>
            <s xml:id="echoid-s5503" xml:space="preserve">contra retrahi debere, ſi Teleſcopium poſt annexum
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            pondus elevetur.</s>
            <s xml:id="echoid-s5504" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5505" xml:space="preserve">Ubi ergo ita conſtituta eſt Machina, ut ad idem punctum
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            appenſo & </s>
            <s xml:id="echoid-s5506" xml:space="preserve">ſublato pondere viſum dirigamus, invertenda eſt,
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            ſuſpendendo eam ex annulo inferiori, & </s>
            <s xml:id="echoid-s5507" xml:space="preserve">plumbum brachio
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            alteri annectendo; </s>
            <s xml:id="echoid-s5508" xml:space="preserve">quia citius motum ſiſtere jubet, & </s>
            <s xml:id="echoid-s5509" xml:space="preserve">quia
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            hoc ad reliqua quæ ſuperſunt perficienda plurimum conducit.</s>
            <s xml:id="echoid-s5510" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5511" xml:space="preserve">Quod ſi tunc filum in Teleſcopio, uti antea collineando,
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            punctum idem ac in præcedenti obſervatione obtegat, pun-
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            ctum hoc in eodem plano Horizontali cum centro tubi Te-
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            leſcopii exiſtere certiffimum eſt, quemadmodum demonſtra-
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            bitur.</s>
            <s xml:id="echoid-s5512" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5513" xml:space="preserve">Verum ſi filum punctum idem collimando non obtegat,
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            elevando & </s>
            <s xml:id="echoid-s5514" xml:space="preserve">declinando filum, opecochleæ huic uſui adapta-
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            tæ, eo poterit reduci, elevando nempe filum ſi ad punctum
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            magis elevatum viſus dirigatur, & </s>
            <s xml:id="echoid-s5515" xml:space="preserve">contra, Teleſcopium
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            poſt ſingulas fili mutationes invertendo.</s>
            <s xml:id="echoid-s5516" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5517" xml:space="preserve">His peractis Inſtrumentum perfecte erit rectificatum, </s>
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