The helmsman rings the ship’s bell for every half hour of the four-hour ship’s watch. A ship is a round-the-clock operation, and ship’s crews work four hours on and four hours off. To change the routine two two-hour dogwatches usually run between 4 and 8 PM. One bell – One ring (say 12:30)… Two bells – Two rings (say 1 PM)… etc. until… Eight bells – Eight rings (4PM). AM-Living bells are made of heavy solid brass, handmade and sand-cast. The chunky hand knotted lanyard offers years of use.