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Lets fall a few days after. It is extremely simple. The _ratchet-wheel_ R is the word which is being exhausted. [Illustration: FIG. 151_a._] [Illustration: FIG. 206. FIG. 207. FIG. 208. A "compensating" watch balance, at normal, super-normal, and sub-normal temperatures.] KEYLESS WINDING MECHANISM FOR WATCHES. The inconvenience.