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- Chinese Duplex or Crab Tooth Duplex is a
- modification of the duplex in as much as
- exactly the same principles ar present,
- the only difference being in the locking
- section of the escape wheel; there are
- two locking teeth close together instead
- of single tooth between each impulse tooth
- the idea being to give the impression that
- the watch is beating seconds.
-
- If the watch train is of 14,400 vibration
- per hour, the seconds hand apparently moves
- every second, but if very closely watches
- the slow progress and recoiling of the wheel
- by the hand until it gets its impulse and
- jumps a full second will be noticed.