Normal Use - Patek Philippe 5370 Mode D'emploi

SPLIT-SECONDS CHRONOGRAPH
The two seconds hands are started and stopped
by consecutively pressing the button at 2 o'clock.
To read a lap time without stopping the chro-
nograph, press the button in the crown (split-
seconds button); this will stop the split-seconds
hand only. When you press the split-seconds
button anew, the split-seconds hand will swiftly
catch up with the chronograph hand again. Re-
peat the process to obtain further lap time read-
ings. We advise against running the chronograph
permanently; this could cause premature wear of
the mechanism.

NORMAL USE

Actuate the button at 2 o'clock: this simultane-
ously starts the chronograph and split-seconds
hands.
Actuate the button in the crown: this stops the
split-seconds hand.
Actuate the button in the crown again: the split-
seconds hand catches up with the chronograph
hand.
Actuate the button at 2 o'clock: this stops the
chronograph.
Actuate the button at 4 o'clock to set the super-
imposed chronograph and fly-back hands to zero
(reset).
Caution: Do not reset before the chronograph and split-
seconds hands are superposed. Otherwise, the split-seconds
hand will remain at its last lap time position. You must then
actuate the button in the crown to reset it.