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
In a single acting steam engine

The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft
The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft
The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft
The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft

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