Sea Rangers tried to run their 'ships' in as nautical a way as possible, adopting as many of the traditions of the navy as they could. So for many years they divided their crew into 'watches' rather than Patrols, and where possible they sourced a ship's bell to mount in their meeting place, in order to sound 'ship's time' during their 'musters' as the unit meetings were known.
On board ship, the watch changes every 4 hours, hence the ship's day is broken into 6 sections, and crew members would usually work two watches per 24 hours. They are:
Middle Watch - Midnight to 4am
Morning Watch - 4am to 8am
Forenoon Watch - 8am to Noon
Afternoon Watch - Noon to 4pm
Dog Watch - 4pm to 8pm
First Watch - 8pm to Midnight.
As the day is divided into these 4-hour 'watches', each watch is divided into eight equal half-hour increments. Bells are rung starting with the first half-hour after a watch begins. The striking pattern is:
First half-hour: 1 bell
Second half-hour: 2 bells
Third half-hour: 2 bells, pause, 1 bell
Fourth half-hour: 2 bells, pause, 2 bells
Fifth half-hour: 2 bells, pause, 2 bells, pause, 1 bell