The circulation in a Yarrow boiler depended on a temperature difference between the inner and outer tube rows of a bank, and particularly upon the rates of boiling. Whilst this is easy to maintain at low powers, a higher pressure Yarrow boiler will tend to have less temperature difference and thus will have less effective circulation.Learn More
Syphons improved water circulation in the boiler and insured more uniform temperatures in the boiler, increasing fuel efficiency. Three-cylinder steam locomotive: A steam locomotive containing a third cylinder located under the smokebox between the two outside cylinders. It transmitted power to the driving wheels by means of a main rod which Learn More