Because they explain the secret of how to build the chronometer.
We're too weak, too *all, and this chronometer is too important to them.
Nightingale destroyed the chronometer and sought to murder himself.
It appears to be a chronometer, although of a uniquely complex nature.
It contains the secrets of the chronometer's construction, carefully encrypted.
According to the chronometers, two full days have passed.
All chronometers have been wound and compared, and she requests permission to strike eight bells on time.