Victorinox SWISS AIR FORCE Manual page 33

Measurement of Intermediate (Split) Times
A. Press Pusher A to start timing.
B. Press Pusher B to read off the first split time without interrupting
the measurement of the total time.
C. Press Pusher B to continue timing. The chronograph will continue its
measurement by reverting the 1/10th hand to zero and "flying back"
the other hands to recover the elapsed time.
D. Press Pusher B again to read the second split time.
E. Repeat this procedure until the action to be timed has been completed.
F. Press Pusher A to stop timing.
G. Once the timing operation has been stopped, press Pusher B
(at 10 o'clock) briefly until the hands revert to the original position.
The chronograph and totalizer hands will be reset to zero.
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