SIGNALLING A FOUR
A boundary is signalled by waving an arm from side to side, finishing with the arm across the chest.
Each individual umpire has his own way of signalling a four.
They all vary slightly - we've all got our own idiosyncracies.
For any boundary incident, such as the issue of whether a four has been scored, we can call for a TV replay and get an adjudication from the third umpire if required.
If there are no television cameras present, we have to rely on the integrity of the fielder really.
We would ask him and hope he is an honest boy who will give us a truthful answer.