
How's the watch actually works ?

Words and Terms: Chronograph
Watch or other apparatus with two independent time systems: one indicates the time of day, and the other measures brief intervals of time. Counters registering seconds, minutes and hours can be started and stopped as desired. It is therefore possible to measure the exact duration of a phenomenon. The term chronograph is often confused with the similar but very different term, 'chronometer'. Chronographs generally have a start/stop pusher and reset pusher. One touch of the start/stop pusher activates the (usually) separate chronograph hand. A second touch of the start/stop pusher stops the chronograph. Many chronographs usually measure durations as long as 12 hours, 29 minutes and 59 seconds.