Bentonite has been widely used as a foundry-sand bond in iron and steel foundries. Sand castings are produced in specialized factories called foundries. Bronze or brass foundries use crucible furnaces or induction furnaces. Other industry included iron foundries and cotton mills. Companies in this emerging field grew out of iron foundries, shipyards, forges and repair shops. These included breweries, iron foundries and a woollen mill. The financial strain is being felt by both large merchant foundries and their fabless customers. In industrial facilities such as steel foundries and power plants, louvers are very common. Many large foundries and glassworks attracted workers from all areas of Britain. The company has grown mainly through acquisition of other domestic foundries and related enterprises. It is currently available from the ITC and Linotype foundries. Designers of typefaces are called "type designers" and are often employed by "type foundries". Foundries and iron works were also established. The Baird's subsequently constructed numerous iron foundries in Coatbridge including the famous Gartsherrie iron works. The blast furnace is similar in structure to a cupola furnace used in iron foundries.