ABSTRACT
Shortly after commencing supply, additional plant became necessary, and as showing how the reciprocating engine was being forced out of the field, the con-suiting engineers, Messrs Charles Merz and William McLellan, decided upon the turbo-generator; the machine was larger than any previously made, since it developed 1500 kW at 1200 r.p.m. It was a single-cylinder machine and the rotor was in three steps, increasing in diameter successively in the ratio 2:1, a proportion that has been adhered to at the Heaton Works over many years. The high-pressure body is a hollow forged drum and the thickness of its walls approximates to that of the enclosing cylinder, so that both it and the rotor expand equally and consequently working clearances remain unaltered.
