1/10
TH
SECOND CHRONOGRAPH
The Patek Philippe 1/10
th
second chronograph is
a monopusher chronograph that measures and
displays time intervals with one-tenth of a second
accuracy. It has two large sweep hands – the
chronograph hand – and the tenth of a second
hand (red lacquered) – as well as a minutes hand
on a 30-minute counter at 3 o’clock and a small
seconds hand at 9 o’clock.
Actuating the pusher at 2 o’clock sequentially
activates the three following commands:
1. Simultaneously start the chronograph and
1/10
th
of a second chronograph hands.
2. Simultaneously stop the chronograph and
1/10
th
of a second chronograph hands.
3. Reset the chronograph and 1/10
th
of a
second chronograph hands.
When performing a timing operation, the central
hand of the chronograph enables you to read
off the number of seconds elapsed in the usual
way. To do this, simply look at the corresponding
number of seconds on the beaded minute-track
(on which each bead corresponds to one second).
The central tenth of a second hand shows the
number of tenths that have elapsed since the last
red subdivision. Each large red segment on the
outer railway scale corresponds to one second,
while the small white segments correspond to
one-tenths of a second. Finally, don’t forget
to read the number of minutes elapsed in the
instantaneous 30-minute counter positioned at
3 o’clock. The tenth of a second hand makes
one full turn of the dial in 12 seconds, which is
five times faster than a sweep seconds hand. It
is this technical feature that makes it possible
to read tenths of a second easily and accurately.
Note
: the difference in the speed of rotation of the two
central hands means that during a timekeeping session,
these two hands are superimposed every 15 seconds.
We advise against running the chronograph permanently;
this could cause premature wear of the mechanism.
