to this day. Prior to the 19th century, weaving was largely a cottage industry which took place around the towns and villages of the county. The Industrial Revolution saw the emergence of large-scale mills, with many concentrating in Paisley. In the 1930s, around 28,000 people were employed in the Coats mills in the town. Trade and shipbuilding Greenock's coastal position made the county an early centre for overseas trade. Shipbuilding on the River Clyde, particularly at Renfrew and Port Glasgow became significant in the later part of the 19th century. These emerged into the Lower Clyde Shipyards. Of the industry, only Ferguson Marine Engineering in Port Glasgow remains today. Many of the county's traditional industries were driven by export strength, with examples such as sugar refining, foundry-work, rope-making, machine-making, mineral work and the manufacture of chemicals are all noted as significant to the economy of Renfrewshire in the 1880s Gazetteer for Scotland entry, with the central areas for commerce noted as being Greenock and Port Glasgow. Shipping continues in Greenock at the Ocean Terminal docks. Greenock's ports remain active today with shipping from Ocean Terminal docks. Modern industries During the second half of the 20th century, some parts of the county experienced the effects of deindustrialisation. In modern times, many of the settlements in the centre and east of Renfrewshire serve as commuter towns within the Greater Glasgow area. All three local authority in the county are partners in the Glasgow City Region City Deal, an investment scheme part of wider UK City Deals to promote investment and economic growth. In the south-east of Renfrewshire on Eaglesham Moor can be found Whitelee Wind farm, the largest on-shore wind farm in the United Kingdom. Culture County symbols The coat of arms of Renfrewshire was granted to the county council in 1899. The lymphad or galley is taken from the arms of the county town, Renfrew, which once served as an important port on the River Clyde. The shield of arms are those of the Royal House of Stewart, recognising the county as 'cradle of the Stewart Kings'. The blazon of the arms is "Azure; a lymphad, sails furled, argent, on a shield or, pendent from the mast, a fess checky azure and argent". Another symbol associated with the county is the Prince of Wales's feathers badge, demonstrating the heir to the throne's connections as Baron Renfrew. It was used historically on