Steam Boilers, Engines, Nozzles and Turbines
When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

Internally fired boiler
Externally fired boiler
Forced circulation boiler
Natural circulation boiler

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Steam Boilers, Engines, Nozzles and Turbines
The difference between Cornish boiler and Lancashire boiler is that

Former contains one fire tube and latter contains two fire tubes
Former is water tube type and latter is fire tube type
Former is fire tube type and latter is water tube type boiler
None of the listed here

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