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Chronograph watches can measure and display elapsed time. Usually three subcounters on the dial display the elapsed seconds, minutes and hours.
The Flyblack function means that the chronograph hand can be reset to zero and immediately started again by pressing once the pusher. That’s why there are two hands for the chronograph.
Minute repeater watches ring whenever you activate the pusher (contrary to chimes). The most complicated ones can ring hours, quarters and minutes.
The tourbillon system was made to compensate the Earth’s gravitational force by mounting the escapement in a revolving cage. It gives the watch a better accuracy. This complication is known as one of the most difficult to make.
Just like the tourbillon, the flying carrousel was made to compensate the earth’s gravitational force to give watches a better accuracy.