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

None of the listed here
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

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Steam Boilers, Engines, Nozzles and Turbines
The function of an eccentric rod is

To provide reciprocating motion to the slide valve
To convert reciprocating motion of the piston into rotary motion of the crank
To provide simple harmonic motion to the D-slide valve
To convert rotary motion of the crankshaft into to and fro motion of the valve rod

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