Bell hung for full circle ringing

The bell in this diagram is hung for full circle change ringing. That is, the bell is hung so that it can rotate through 360° and it is fitted with a wheel and rope. The bell starts in the 'mouth down' position and has to be rung 'up' before ringing can commence. The ringer does this by pulling the rope repeatedly, gradually making the bell swing higher and higher until it rotates through a full circle every time the rope is pulled. Once this operation is complete the bell turns one complete circle at each pull of the rope, from mouth up to mouth up and then back the other way, the bell striking once near the end of each revolution.