In the 19th century, shipbuilding and heavy engineering were central to the city's prosperity; and the city was a powerhouse of the Industrial Revolution. This revolution resulted in the urbanization of the city. In 1817 the Maling company, at one time the largest pottery company in the world, moved to the city. The Victorian industrial revolution brought industrial structures that included the 2 1⁄2-mile (4.0 km) Victoria Tunnelling, built in 1842, which provided underground wagon ways to the staithes. On 3 February 1879, Mosley Street in the city, was the first public road in the world to be lit up by the incandescent lightbulb. Newcastle was one of the first cities in the world to be lit up by electric lighting. Innovations in Newcastle and surrounding areas included the development of safety lamps, Stephenson's Rocket, Lord Armstrong's artillery, Be-Ro flour, Joseph Swan's electric light bulbs, and Charles Parsons' invention of the steam turbine, which led to the revolution of marine propulsion and the production of cheap electricity. In 1882, Newcastle became the seat of an Anglican diocese, with St. Nicholas' Church becoming its cathedral.