This 3000 kilowatt turbo-alternator was the first of the new machines introduced by the Auckland Electric Power Board to supply the electrical requirements of the city. Imported from England, this unit cost £25,000. Two 5000 k.w. units have also been recently installed. In each of them the turbine rotor weighs four tons, and the alternator /otor eight and a-half tons, these combined rotors running at 3000 revolutions per minute. Despite the high speed at which this huCc weight is spinning there is no vibration, a fact due to the revolving parts being perfectly balanced. It is possible to stand a coin on its ed»e oh the most overhung part of the machine, while it is ia motion.

Auckland Star, Volume LV, Issue 76, 29 March 1924, Page 17

This 3000 kilowatt turbo-alternator was the first of the new machines introduced by the Auckland Electric Power Board to supply the electrical requirements of the city. Imported from England, this unit cost £25,000. Two 5000 k.w. units have also been recently installed. In each of them the turbine rotor weighs four tons, and the alternator /otor eight and a-half tons, these combined rotors running at 3000 revolutions per minute. Despite the high speed at which this hu C c weight is spinning there is no vibration, a fact due to the revolving parts being perfectly balanced. It is possible to stand a coin on its ed»e oh the most overhung part of the machine , while it is ia motion.