Steam Boilers, Engines, Nozzles and Turbines
A fusible plug is fitted in small boilers in order to

Avoid excessive build up of pressure
Extinguish fire if water level in the boiler falls below alarming limit
Control steam dome
Avoid explosion

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

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

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