Clyde Iron Works started as an offshoot of the Carron iron works in 1786 and by the early 20th Century was the largest ironworks in Scotland. It was here, in 1828, that the hot blast was invented by James Beaumont Neilson. Clydebridge Steelworks started in 1887. It was linked with Clyde Iron Works just prior to WWII when it became the largest integrated steelworks in the country, producing steel plates for most of the famous ships on the Clyde. Clyde Iron Works finally closed in 1978. Steelmaking at Clydebridge stopped in 1978, the plate mill closed in 1982, but the heat treatment section of the works is still in operation.