Sea Rangers tried to run their 'ships' in as nautical a way as possible. So they divided their crew into 'watches' rather than Patrols, and where possible sourced a ship's bell in order to sound ship time during their musters.
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.
The day is divided into 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