1. 12:50 - the gun is wheeled back and prepared for loading
2. 12:55 - the charge is rammed home
3. 12:56 - the gun is re-positioned for firing
4. 12:58 - mechanism is connected to Bain's Electric Clock
5. 12:59 - a final check is made and the countdown continues
6. 13:00 - As the gun booms over the City, the Time Ball housed at the Nelson Monument on Calton Hill is dropped.