Chronograph means a clock with hour and minute indicators, at which a mechanism allows, by simply pressing some buttons, to start, stop and reset the second indicator. This indicator is usually positioned in the center of the dial. The time indication is not affected by the handling of the chronograph. The two-button chronograph has become widespread since the 1930s. One button allows the chronograph indicator to be turned on and off, and the second is used exclusively to bring the indicator to zero. Such chronographs allow measurements by addition, ie the measurement of time can be stopped and then continued from the last stop.
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