An idea of Arsenal 's innovative manager at the time - Herbert Chapman - the first of many clocks counted down the 45 minutes of each half .
It was changed to a standard clock after criticism that the ' countdown ' undermined the match officials .
An idea of Arsenal 's innovative manager at the time - Herbert Chapman - the first of many clocks counted down the 45 minutes of each half but it was changed to a standard clock after criticism that the ' countdown ' undermined the match officials .