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Any typos are as a result of direct translation of the
original French.
Oyster Perpetual Cosmograph Daytona Rolex
 The
drawings below have nothing to do with the photograph of the Rolex stopwatch.
The modern stop watches have two push rods in general.
By looking at side of the dial, the push rod at 2 hours carries out the starting
and the stop, the push rod at 4 hours only the restoring.
In this system, the ratchet of the wheel with column has the double of teeth
that columns (simple stopwatch, triples teeth).
With this system, one can, after having immobilized the second hand, either to
restart it by a pressure on the push rod at 2 hours, or to carry out the
restoring while pressing on the push rod located at 4 hours.
Two successive pressures on the push rod top cause alternatively the departure
and the stopping of the second hand.
It is only when the second hand is stopped that one can make the restoring.
During the restoring, it is significant that the intermediate rocker, as well as
the brake are released. It is the hammer which carries out these two operations.
In this part, the hammer is under the effect of a spring which tends to reduce
it.
With the stop the hammer is maintained by a pin fixed under this last and which
comes crocher at the time of the starting to a bolt (in blue sky).
Restoring indirect:
At the time or one presses on the push rod of restoring, the rocker comes to
push the bolt what releases the hammer.
The hammer while going down, by means of a nozzle and pin fixed on the
intermediate rocker of meter (4) raises the latter to release it from the wheel
stop watch.
It also raises the brake with the pin fixed under the hammer.
Another system: Restoring direct
If, after the stopping of the stop watch, one presses on the push rod of
restoring, this one, via the rocker of restoring, actuates the hammer which
descends and strikes the hearts.
This action, a nozzle of the hammer comes into contact with the pin of the brake
and raises it, just as the round shape of the hammer raises the intermediate
rocker of meter.
As soon as the push rod is released, the hammer returns to its initial position
under the action of its spring and releases the intermediate rocker of meter and
the brake, which under the action of their respective spring take again their
initial positions.
The wheel of stopwatch will be immobilized by its spring of friction and the
wheel meter minute by its saltire.
When the stopwatch functions, it is not possible to carry out a bus restoring
the nozzle of the hammer is opposite a column.
Stopwatch in function works
Controls and safety measures to be observed during the
reassembly of a stop watch.
To control:
 Penetrations
of gears on a full rotation.
Gears
coil on field/wheel clutch 2/3 of teeth.
Gears
coil clutch/wheel stopwatch 1/3 of teeth.
Safety measures:
Small play enters the hammer and the heart of the meter of minutes.
The saltire of the meter must press on two teeth of the wheel of meter of
minutes.
To the position departure , safety between the insulator (nozzle) of the
hammer and the pin of brake, and enters, the hammer and the pin of setback.
To control: the finger stopwatch should not involve a tooth of the intermediate
gear of meter at the time of the first pressure of starting.
With the off position , safety between the insulator and the pin of the
brake and between the arrowheads and the points of the hearts.
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