The Air Ministry was a department of the Government of the United Kingdom with the responsibility of managing the affairs of the Royal Air Force, that existed from 1918 to 1964. The Air Ministry was responsible for weather forecasting over the UK, from 1919 it being the government department responsible for the Meteorological Office. In the 1930s, the Air Ministry commissioned a scientific study of propagating electromagnetic energy which concluded that a death ray was impractical but detection of aircraft appeared feasible. In 1964 the Air Ministry merged with the Admiralty and the War Office to form the Ministry of Defence.