Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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HOROLOG. OSCILLATOR.
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<
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xml:space
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<
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.
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<
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Fig. 3.</
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cloidem deſignare. </
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<
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xml:space
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">Deſcribatur circulus diametro A B, quæ
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dimidiæ longitudini perpendiculi æqualis ſit. </
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xml:space
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">In cujus cir-
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cumferentia ſumptis partibus æqualibus quotlibet, A C,
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C D, D E, E F, A G, G H, H I, I K, jungantur
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G C, H D, I E, K F, quæ erunt inter ſe parallelæ.
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</
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<
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xml:space
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">Deinde arcui A F ſumatur æqualis linea recta L M, eaque
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in partes æquales totidem dividatur quot ſunt in arcu A F,
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earumque partium uni æquales ponantur ſingulæ C N,
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G O in recta C G; </
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<
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xml:space
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">duabus vero partibus rectæ L M, æ-
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quales fiant ſingulæ D P, H Q in recta D H. </
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<
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xml:space
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ro, ſingulæ E R, I S in recta E I; </
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<
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xml:space
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">atque ita porro ſi par-
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tes plures fuerint acceptæ ac tandem toti L M æquales
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fiant ſingulæ F T, K V in linea extrema F K. </
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<
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xml:space
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">Jam ſi
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curvæ deſcribantur per puncta A O Q S V, A N P R T,
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hæ rurſus quæſitæ cycloidis partes erunt, inter quas per-
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pendiculum affigi oportet.</
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<
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xml:space
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">Recta autem L M æqualis arcui A F invenitur, ſi pri-
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mum duabus rectis, quæ ſemiſſibus arcus A F ſubtendun-
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tur, æqualis ponatur X Z, totius vero arcus ſubtenſæ A F
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æqualis ab eodem termino accipiatur X Y, differentiæque
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Y Z triens Z Δ ad totam X Z adponatur. </
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<
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xml:space
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">Nam tota X Δ
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toti arcui A F tam prope æqualis erit, ut licet ſextans fue-
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rit circumferentiæ, (neque major hic unquam requiritur)
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non una ſexies milleſima parte ſuæ longitudinis deficiat,
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uti in his, quæ de Circuli Magnitudine antehac ſcripſimus,
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demonſtratum eſt.</
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<
s
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xml:space
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">Explicitis quæ ad horologii fabricam attinent, nunc quo-
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que illud declarandum eſt, quo pacto ad veram horarum
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menſuram componi debeat. </
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<
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xml:space
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">Ergo primum, an recte ſe ha-
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beat motus ejus, hoc modo examinabitur.</
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</
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<
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xml:space
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">Oculo obſervatoris certus eligatur locus, unde ſidera de-
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ſpici poſſint, ſimulque tecta parietesve vicinarum ædium,
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ſic poſita, ut, cum eò appulerint ſtellæ quædam è fixarum
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numero, ſimul videri deſinant. </
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<
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xml:space
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">Eo loco foramen, ad pu-
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pillæ magnitudinem, conſtituatur, ut ſequentibus </
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