Split Second Chronograph Chronograph Functions index
Timing to 1/5 second.
Timing up to 30 minutes.
Timing telephone conversations.
Timing up to 12 hours.
Indicating the date.
Indicating the day of the week.
Indicating the month.
Indicating the phases of the moon.
Multiple timing by means of split-second hand. (N).
Chronographs with split-second mechanisms are particularly useful for timing simultaneous phenomena starting of the same time, but of different duration, such as sporting events in which several competitors are taking part.
In chronographs of this type, an additional hand is superimposed on the chronograph hand. Pressure on pusher A starts both the hands, which remain superimposed as long as the split-second mechanism is not blocked. This is done by pressing the split-second hand while the chronograph hand continues to move. After recording, the same pusher is pressed a second time, releasing the split-second hand, which instantly joins the still-moving chronograph hand, synchronozing with it, and is thus ready for another recording.
Pressure on pusher B brings the four hands back to zero simultaneously, provided the split-second hand is not blocked. Pressure on pusher O releases the split-second hand, which instantly joins the chronograph hand if the split-second hand happens to be blocked.
Pushers K and L, shown by arrows, on the side of the case of this chronograph, can be used to set the calendar and moon-phase mechanisms and are pressed down with the point of a pin.
As there is no standard arrangement of the positions and corresponding functions of the pushers, they are not necessarily the same as those shown above.
A = Starting pusher
B = Return pusher
K, L = Pusher for setting calendar and moon phase mechanism
N = Split second hand
O = Split second pusher