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The bells used to mark shipboard time were organized into a schedule that reflected the four-hour watch served by the crew. Each watch is identified by its time of day and one watch, called the Dog Watch, was split into two parts to allow taking of an evening meal. The resulting number of uneven watches insured both crews shared the graveyard shift of 0000-0400 equally.
These are watches observed by ship's crew:
Middle Watch(0000 - 0400)
Morning Watch (0400 - 0800)
Forenoon Watch (0800 - 1200)
Afternoon Watch (1200 - 1600)
First Dog Watch (1600 - 1800)
Second Dog Watch (1800 - 2000)
First Watch (2000 - 2400)
Bells are sounded in a pattern every thirty minutes.
The maximum number of bells that can be struck is eight, hence the saying "eight bells and all is well." This is the common schedule of ship's bells that is repeated every four hours:
00:30 1 bell
01:00 2 bells
01:30 2 bells, pause, 1 bell
02:00 2 bells, pause, 2 bells
02:30 2 bells, pause, 2 bells, pause, 1 bell
03:00 2 bells, pause, 2 bells, pause, 2 bells
03:30 2 bells, pause, 2 bells, pause, 2 bells, pause, 1 bell
04:00 2 bells, pause, 2 bells, pause, 2 bells, pause, 2 bells