Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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HOROLOG. OSCILLATOR.
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fublatum in V: </
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">& </
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<
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xml:space
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">jungantur C N, N V, V C, V L. </
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.</
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rit ergo V N æqualis C A; </
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<
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xml:space
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">imo erit ipſa C A translata in
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V N. </
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<
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">Jam quia recta L C æquatur curvæ L V, ac proin-
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de major eſt recta L V, erit in triangulo C L V angulus
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L V C major quam L C V. </
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<
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">Quare addito inſuper angulo
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L V N ad L V C, fiet totus N V C major utique quam
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L C V, ac proinde omnino major angulo N C V, qui pars
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eſt L C V. </
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<
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">Ergo in triangulo C V N latus C N majus erit
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latere V N, cui æquatur C A, ideoque C N major quo-
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que quam C A, hoc eſt quam C M. </
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<
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xml:space
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">Unde apparet pun-
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ctum N cadere extra circulum M A F, qui proinde tanget
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curvam in puncto A. </
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<
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">quod erat demonſtrandum.</
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<
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<
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<
s
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">Eſt autem eadem quoque tum conſtructio tum demonſtra-
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tio, ſi curva genita ſit à puncto deſcribente, vel intra vel
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extra ambitum figuræ circumvolutæ ſumpto. </
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<
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">Niſi quod,
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hoc poſteriori caſu, pars quædam curvæ infra regulam de-
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ſcendit, unde nonnulla in demonſtratione oritur diverſitas.</
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<
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</
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<
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xml:space
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">Sit enim punctum A, per quod tangens ducenda eſt, da-
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<
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">TAB. VIII.
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Fig. 1.</
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tum in parte curvæ N A B, quæ infra regulam C L de-
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ſcendit, deſcripta nimirum à puncto N extra figuram revo-
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lutam ſumpto, ſed certam poſitionem in eodem ipſius pla-
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no habente. </
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<
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">Invento igitur puncto C, ubi figura revoluta
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tangit regulam C D quum punctum deſcribens eſſet in A,
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ducatur recta C A. </
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<
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">Dico hanc curvæ N A B occurrere ad
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rectos angulos, ſive circumferentiam radio C A centro C
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deſcriptam tangere curvam N A B in puncto A. </
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<
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">Oſtendetur
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autem exterius ipſam contingere, cum in curvæ parte ſupra
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regulam C D poſita interius contingat.</
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<
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">Poſitis enim & </
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">deſcriptis iisdem omnibus quæ prius, os-
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tenditur rurſus angulus E C H major quam C E H. </
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<
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ad E C H addito H C B fit angulus E C B; </
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<
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">à C E H
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auferendo H E B, qui æqualis eſt D C A, fit angulus
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C E B. </
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triangulo E C B latus E B majus quam C B. </
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<
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æqualis eſt C A, ſive C F. </
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</
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à centro remotum.</
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