Economy of Devon (chewing gum) and HMNB Devonport (the largest naval base in western Europe) are in Plymouth. Torquay was home to Beverage Brands, the producers of WKD Original Vodka. Britannia Royal Naval College is at Dartmouth. Mining for tin and copper was carried on in Devon from ancient times until the 1930s: see Dartmoor tin-mining. Agriculture has been an important industry in South West England since the 19th century: approximately 80% of land in the South West of England is in agricultural use (19.6% of England's total). In the later 19th and early 20th centuries there were a number of potteries in
Royal Naval College, Greenwich building. The Navy's Department of Nuclear Science and Technology opened on the college premises in 1959, and JASON, the department's research and training reactor, was commissioned in the King William building in 1962. In 1967 Queen Elizabeth II knighted Francis Chichester on the river steps of the College, honouring his achievement in circumnavigating the world as a solo yachtsman, using the old route of the clippers, becoming the first to do so. His was also the fastest such circumnavigation, taking nine months and one day. The Royal School of Naval Architecture, which had been part of the College since 1873,