Birmingham is one of England's principal industrial centres and has a history of industrial and scientific innovation. It was once known as 'city of a thousand trades' and in 1791, Arthur Young (the writer and commentator on British economic life) described Birmingham as "the first manufacturing town in the world". Right up until the mid-19th century Birmingham was regarded as the prime industrial urban town in Britain and perhaps the world, the town's rivals were more specific in their trade bases. Mills and foundries across the world were helped along by the advances in steam power and engineering that were taking place in the city. The town offered a vast array of industries and was the world's leading manufacturer of metal ware, although this was by no means the only trade flourishing in the town.