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

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              <pb o="257" file="0335" n="363" rhead="DESCRIPTIONES."/>
            obſtat (quod notabile eſt) ſi lentium axes non per harum
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            centra transeant, aut ſi ipſæ non exacte in recta linea col-
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            locentur; </s>
            <s xml:id="echoid-s5518" xml:space="preserve">& </s>
            <s xml:id="echoid-s5519" xml:space="preserve">conſequenter ſecure Machinâ utemur, dummo-
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            do nulla ſuperveniat mutatio; </s>
            <s xml:id="echoid-s5520" xml:space="preserve">filum namque Horizontale
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            cujuscunque objecti, ad quem fiet collimatio, indicabit lo-
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            cum qui eſt in eodem plano Horizontali cum centro Te-
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            leſcopii; </s>
            <s xml:id="echoid-s5521" xml:space="preserve">ſi autem mutatio quædam detur, in ſingulis obſer-
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            vationibus detegi poteſt, primo cum plumbo annexo, dein-
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            de ſine plumbo collineando, & </s>
            <s xml:id="echoid-s5522" xml:space="preserve">tandem Teleſcopium in-
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            vertendo. </s>
            <s xml:id="echoid-s5523" xml:space="preserve">Et hoc utique præcipuum eſt, quo Libella præ
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            cæteris gaudet commodum, quod in uſu erroris periculum
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            nullum detur.</s>
            <s xml:id="echoid-s5524" xml:space="preserve"/>
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            <s xml:id="echoid-s5525" xml:space="preserve">Pes, quo Machina innitatur, eſt rotunda ferri, aut bra-
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            cteæ lamella modice concava, cui annectuntur tres baculi
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            longitudinis circiter trium pedum cum ſemiſſe, pyxis huic
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            lamellæ impoſita hanc in tribus punctis, tangit, quare facile
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            movetur, & </s>
            <s xml:id="echoid-s5526" xml:space="preserve">ita conſtituitur, juvante cavitate lamellæ, ut
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            plumbum in pyxide ſua libero fruatur motu, quod videtur
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            trans aperturam M in operculo ligneo.</s>
            <s xml:id="echoid-s5527" xml:space="preserve"/>
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            <s xml:id="echoid-s5528" xml:space="preserve">Gravitas plumbi, ut pyxis firmiter pedi inhæreat, inſervit,
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            verum ſi firmius eam ſuſtentari velimus in lamellæ cavæ me-
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            dio foramen f@at.</s>
            <s xml:id="echoid-s5529" xml:space="preserve"/>
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            <s xml:id="echoid-s5530" xml:space="preserve">Si totum pondus in pyxide G recludi nolumus, tertia vel
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            quarta tantum pars huic includatur & </s>
            <s xml:id="echoid-s5531" xml:space="preserve">reliquum eidem ferreæ
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            caudæ annectatur, ſed extra pyxidem; </s>
            <s xml:id="echoid-s5532" xml:space="preserve">primo tunc obſerva-
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            bitur cum minori pondere ſolo, pyxide contento, tum cum
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            altero deſuper addito, in conſtituendo filo Horizontali am-
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            bobus utentum.</s>
            <s xml:id="echoid-s5533" xml:space="preserve"/>
          </p>
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            <s xml:id="echoid-s5534" xml:space="preserve">Hac methodo Teleſcopii agitationes promptiſſime, in
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            omnibus obſervationibus quæ ad rectificandam Machinam in-
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            ſtituuntur, ceſſant; </s>
            <s xml:id="echoid-s5535" xml:space="preserve">ſi autem nullum in quibusdam obſerva-
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            tionibus imponatur pondus, hæ motiones difficilius ſiſtuntur.</s>
            <s xml:id="echoid-s5536" xml:space="preserve"/>
          </p>
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            <s xml:id="echoid-s5537" xml:space="preserve">Uncus F, cui Libella appenditur, ſimpliciter ligneæ pla-
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            næ cruci annecti poteſt, licet hic annexus apparet annulo,
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            qui ope cochleæ adhærentis annulo, quo Machina defertur,
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            elevari & </s>
            <s xml:id="echoid-s5538" xml:space="preserve">deprimi poteſt.</s>
            <s xml:id="echoid-s5539" xml:space="preserve"/>
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