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

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

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Steam Boilers, Engines, Nozzles and Turbines
Boiler H.P. is defined as the

The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
Steam evaporation rate per kg of fuel fired
Work done by 1 kg of steam at saturation condition

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