Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 1: Opera mechanica
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HOROLOG. OSCILLATOR.
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dem ſuperficiem vel aliam ſimilem ſimiliter que po-
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<
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ſitam feratur, æqualibus temporibus per idem ſpa-
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tium deſcendet atque aſcendet.</
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<
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">Velut ſi per ſuperficiem A B deſcendat mobile, atque, ubi
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Fig. 4.</
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ad B pervenerit, converſo motu ſurſum per eandem A B, vel
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ei ſimilem & </
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">reſpectu plani horizontalis ſimiliter poſitam
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B C, aſcendat, conſtat ex ante demonſtratis, perventurum
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ad eandem ex qua venit altitudinem. </
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<
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in punctis quorum eadem altitudo, eandem velocitatem ha-
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beat aſcendendo ac deſcendendo ; </
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<
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præced.</
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bis eadem velocitate ſingulis ſui partibus percurri: </
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tempora utriusque motus æqualia eſſe neceſſe eſt; </
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demonſtrandum.</
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Fig. 5.</
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gulos rectos ſit F G; </
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mino diametri A educta A F extra circulum, quæ
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quidem neceſſario ſecabit circumferentiam, puta
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in B. </
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ceptum, minorem eſſe recta D F.</
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<
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cumferentiam recta B E, quæ neceſſario occurret rectæ F G
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inter F & </
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angulo E B C . </
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<
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Lib. 3. Eucl.</
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E B C conſtituit angulum rectum F B C, erit æqualis B C A.
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<
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angulus F æqualis angulo A C B. </
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<
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qualis angulo F B E. </
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habens crura æqualia F E, E B. </
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rum recta E D, fiet F D, æqualis duabus B E, E D. </
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ce vero duas majores eſſe conſtat arcu B D, iisdem </
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