Nice little museum, mostly about the steel industry in Sheffield, with a huge working steam engine used in a rolling plant in times gone by.
Two exhibits caught my attention aside from the engine:
A crankshaft for a Merlin:

And the business end of one of Barnes Wallis's 22,000 lb Grand Slam or Earthquake bombs. Carried by specially equipped Lancasters and made to rip apart Submariine pens and railway viaducts.
