Operating the Chronograph by means of the pushers

Some chronographs, those of the triple-action pusher type, have a single pusher on the side of the case or just inside the winding-crown "O". This pusher is used successively for starting, stopping and returning the second hand to zero. Once it has been stopped, the chronograph cannot be restarted until the second hand has been brought back to zero. This triple-action system is no longer used for wrist chronographs.

Most chronographs today have two pushers, one of which has a single function and the other two. This double-action system has the advantage of enabling the chronograph to be restarted without the second hand being previously returned to zero.

The usual methods of operation are summarised in the table below:-

PUSHER FUNCTIONS
Type	Pusher	Function	Operation
1	A	1 2 3	Starting    Stopping    Returning hand to zero
2	A B B	1 1 2	Starting    Stopping    Returning hand to zero
3	A A B	1 2 1	Starting    Stopping    Returning hand to zero
4	A B O	1 1 1	Starting    Stopping    Returning hand to zero
5	A O A B	1 1 2 1	Starting    Stopping split-second hand    Stopping chronograph hand    Returning hand to zero
A = Starting pusher B = Return pusher O = Stopping pusher