Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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MACHINARUM
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<
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xml:space
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">Quantum hoc proſit, experitur in ipſius tranſlatione, nam
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tum crucis fila laxari queunt curando, ut ſupra furcam K, & </
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brachium exiguum curvatum R, deſcendat Teleſcopium,
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ne quidem thecam ligneam aperiendo.</
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<
s
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xml:space
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">Ne oleum pyxide G contentum ex hac defluat, dum Li-
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bella in itineribus confertur, pyxidis hujus foramen ipſo
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pondere incluſo claudi poteſt; </
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<
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">curabitur ad hoc, ut pondus
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illud deſuper planum admodum ſit, & </
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<
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pyxidis operculum ope annuli cochleati S.</
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<
s
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">Tubus N, illum in magno repræſentat, cui in interiori
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Fig. 3.</
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Teleſcopii parte Horizontale filum cohæret, continet ela-
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ſtrum O P furcæ Q annexum, cui ſericum filum cera affi-
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gitur; </
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<
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">hoc elaſtrum furcam ad fruſtum bracteæ T trahit,
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quod ingreditur cochlea, quæ reſpondet foramini H in tubo
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Teleſcopii, quo dato foramine etiam modice tubus N verti
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poteſt, ut filum exacte fiat Horizontale, de quo judicatur
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per Teleſcopium videndo.</
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">ut centrum
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gravitatis ſuſpenſæ crucis in recta linea per puncta, qui-
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bus fila brachiis annectuntur, transeunte daretur. </
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<
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præparationis neceſſitas concipiatur, ſciri oportet, non ſufficere
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ſi Teleſcopium ex utroque annulo ſucceſſive ſuſpenſum ad
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idem objecti punctum dirigatur, hoc enim fieri poteſt, licet
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objecti punctum multum infra, aut ſupra Horizontale pla-
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num inveniatur. </
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Fig. 4.</
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C I ſuſpenſionis, aut nexuum filorum linea, quarum linea-
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rum longitudinum hic non habetur ratio, quoniam, cujus-
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cunque magnitudinis Teleſcopium ſit, nihil hoc ad ſuſpen-
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ſi corporis ſitum conferre, notum eſt: </
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ſe mutuo ad angulos perfectè rectos ſecare in puncto H. </
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ſuper centrum gravitatis crucis in E, ponatur in axe A B,
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magis tamen verſus B, quam punctum H; </
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ſpenſa in C, linea quæ a C ad centrum terræ tendit erit C </
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