Most watches have a quartz crystal. This mineral stone has the characteristic of being able to emit a vibration when it is subjected to an electrical field. Thus, when placed in the electric currant provided by the clock battery, the quartz gives off vibrations that are extremely constant. These vibrations cause the watch hands at the end of the mechanism to move. Quartz vibrations are so precise that it allows the watch to only slow by only one minute per year (in the least expensive models.)

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