Victorinox CHRONOGRAPHS Watch Basic Operating Instructions Manual page 18

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.
C. Press Pusher B to continue timing. The chronograph has continued
its measurement so that the chronograph hands catch-up to allow
for the elapsed time.
D. Press Pusher B again to read the 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 completed, press Pusher B.
The hands on the chronograph and totalizer reset to zero.
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