Center wheel "Chrono" (Mobile de chronographe)
The center wheel "Chrono" is a component part of the clockwork of the chronograph (with stopwatch) and carries the main hand. The center wheel "Chrono" drives the minute counter. The clockwork of the chronograph (with stopwatch) measures the duration of time events. This process is commonly known as "horology" or "time- keeping". The chronograph's clockwork starts its movement as soon as the start button is pressed. It stops upon pressing the stop button and is reset to its original position when zeroizing.