Abstract: A large electrical power plant includes two operating units, one of which is more efficient and is run as a base load unit. The less efficient operating unit is run only during periods of peak demand or when the more efficient unit is down. Hot condensate from the more efficient unit is cooled in the condenser of the less efficient unit and then sprayed into the turbine outlet of the more efficient unit. This condenses steam more efficiently, at a lower pressure, and allows the more efficient unit to produce more electricity because there is a greater pressure differential across the turbine. In addition, cool condensate is sprayed into the duct connecting the turbine and the condenser to reduce choking flow, when it is prone to occur. In addition, cool make up water is sprayed into the condenser of the operating unit.

Abstract: A banknote selector comprises an aperture obstructed by a balance rotary shutter, the angular position of which is insensitive to the vibrations of the selector.