Trevithick came to Coalbrookdale from Cornwall because he ... a steam pressure of 45 pounds per square inch - most stationary engines at that time could only achieve 14 psi. With no preconceptions ...

In the space of 40 years, the small village of Coalbrookdale, in Shropshire, where Darby made his discovery, became a major mining site, employing about 500 people. After 1709, Coalbrookdale saw ...