bell

A unit of time measurement traditionally used on sailing ships and equal to one-half hour. A “watch” is the standard period of time a sailor is on duty and is divided into 8 bells or 4 hours. During a watch each half hour is marked by the sounding of the bell.

SHIP’S BELLS
Hour (AM or PM)
12:30 4:30 8:30
1:00 5:00 9:00
1:30 5:30 9:30
2:00 6:00 10:00
2:30 6:30 10:30
3:00 7:00 11:00
3:30 7:30 11:30
4:00 8:00 12:00

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