2 April 1935, Watson-Watt received a patent on a radio device for detecting and locating an aircraft. In mid-May 1935, Wilkins left the Radio Research Station with a small party, including Edward George Bowen, to start further research at Orford Ness, an isolated peninsula on the Suffolk coast of the North Sea. By June, they were detecting aircraft at a distance of , which was enough for scientists and engineers to stop all work on competing sound-based detection systems. By the end of the year, the range was up to , at which point, plans were made in December to set up five stations covering the approaches to London. One of these stations was to be located on the coast near Orford Ness, and Bawdsey Manor was selected to become the main centre for all radar research. To put a radar defence in place as quickly as possible, Watson-Watt and his team created devices using existing components, rather than creating new components for the project, and the team did not take additional time to refine and improve the devices. So long as the prototype radars were in workable condition, they were put into production. They conducted "full scale" tests of a fixed radar radio tower system, attempting to detect an incoming bomber by radio signals for interception by a fighter. The tests were a complete failure, with the fighter only seeing the bomber after it had passed its target. The problem was not the radar but the flow of information from trackers from the Observer Corps to the fighters, which took many steps and was very slow. Henry Tizard, Patrick Blackett, and Hugh Dowding immediately set to work on this problem, designing a 'command and control air defence reporting system' with several layers of reporting that were eventually sent to a single large room for mapping. Observers watching the maps would then tell the fighters what to do via direct communications. By 1937, the first three stations were ready and the associated system was put to the test. The results were encouraging, and the government immediately commissioned construction of 17 additional stations. This became Chain Home, the array of fixed radar towers on the east and south coasts of England. By the start of World War II, 19 were ready for the Battle of Britain, and by the end of the war, over 50 had been built. The Germans were