Built by engineer Adrian Stephens at the Dowlais Ironworks in Merthyr Tydfil. It was a simple ... It was added to every boiler, railway locomotive and steam ship around the world.

One place has seemingly felt this stagnation more than anywhere else. This town has previously been nicknamed the "sick note ...

the ironworks of Merthyr Tydfil rapidly adopted the new invention; the first experiment in locomotion was made in Wales and the country contributed enormously to the supply of fuel for steam ...