Steam Boilers, Engines, Nozzles and Turbines
The function of a flywheel is

To prevent fluctuation of speed
To convert reciprocating motion of the piston into rotary motion
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To keep the engine speed uniform at all load conditions

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

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