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

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            ſutura, ac propterea tantum triplo majora fere omnia ſint
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            apparitura, prægrandi hoc teleſcopio, quam illo pedum
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            tricenum. </s>
            <s xml:id="echoid-s5901" xml:space="preserve">At ſi decuplo exceſſu idem ſuperandum ſit, jam
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            ter mille pedum longitudine opus erit, quo quidem nulla
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            humana ope perveniri poſſe, vel ſolius altitudinis cauſa,
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            manifeſtum eſt.</s>
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            <s xml:id="echoid-s5903" xml:space="preserve">Sane majores multo forent, & </s>
            <s xml:id="echoid-s5904" xml:space="preserve">majori proportione creſce-
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            rent, eæ, quas diximus, aperturæ, ſi nihil aliud obſtaret
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            quam figuræ ſphæricæ parum idonea, in colligendis radiis,
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            curvatura. </s>
            <s xml:id="echoid-s5905" xml:space="preserve">Nunc vero alia quædam, ex ipſa refractionis na-
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            tura, oritur radiorum aberratio, quam ante annos aliquot
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            Neutonus egregiis quibusdam experimentis & </s>
            <s xml:id="echoid-s5906" xml:space="preserve">priſmatum
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            vitreorum coloribus comprobavit. </s>
            <s xml:id="echoid-s5907" xml:space="preserve">Hæc vero & </s>
            <s xml:id="echoid-s5908" xml:space="preserve">ipſa leges
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            ſuas habet, quibus, ſi recte eas perſpicio, ſubdupla illa,
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            quam dixi, aperturarum ad longitudines ratio colligitur.</s>
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        <div xml:id="echoid-div457" type="section" level="1" n="188">
          <head xml:id="echoid-head238" xml:space="preserve">AUCTARIUM.</head>
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            <s xml:id="echoid-s5910" xml:space="preserve">VIdebatur jam perfecta abſolutaque omnibas numeris nova
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            Aſtroſcopia noſtra; </s>
            <s xml:id="echoid-s5911" xml:space="preserve">typisque excuſa, nondum tamen edita
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            erat; </s>
            <s xml:id="echoid-s5912" xml:space="preserve">cum ſecundis cogitationibus, ut fit, alia quædam nobis
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            in mentem venere, quibus ea melior commodiorque fieret. </s>
            <s xml:id="echoid-s5913" xml:space="preserve">Quæ
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            cum auctarii vice hic adponere viſum ſit, ſimul hoc monemus,
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            ut, ſicut poſterius reperta fuere, ita ultimo loco, poſtquam
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            reliqua deſcriptio ac delineatio percepta fuerit, legantur.</s>
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            <s xml:id="echoid-s5915" xml:space="preserve">Cum primum ſpectatores invento noſtro, ac Planetis na-
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            cti ſumus, teleſcopicis obſervationibus minus aſſuetos, docuit
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            experientia, eos quidem per ſe difficilius ſtellæ conſpectum
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            conſequi; </s>
            <s xml:id="echoid-s5916" xml:space="preserve">ſicut antehac quoque, ubi in grandiores tubos
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            inciderant, eveniebat. </s>
            <s xml:id="echoid-s5917" xml:space="preserve">Quod autem hic fieri ſolitum, ut, re-
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            perto prius ſidere, ac manente tubo, tantummodo oculum
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            ei ſpectator juſſus admoveret, id non perinde nobis nunc
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            imitari licebat; </s>
            <s xml:id="echoid-s5918" xml:space="preserve">cum lens oculo proxima, ubi defigeretur,
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            non haberet. </s>
            <s xml:id="echoid-s5919" xml:space="preserve">Itaque hic quoque ratio fuit excogitanda, qua
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            poſitum ſuum ſervaret ocularis lens. </s>
            <s xml:id="echoid-s5920" xml:space="preserve">Quod quidem </s>
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