From the early 1930s eight countries developed radar; these developments were sufficiently advanced by the late 1930s for development work on sound-locating acoustic devices to be generally halted, although equipment was retained. Furthermore, in Britain the volunteer Observer Corps formed in 1925 provided a network of observation posts to report hostile aircraft flying over Britain. Initially radar was used for airspace surveillance to detect approaching hostile aircraft. However, the German Würzburg radar put into use in 1940 was capable of providing data suitable for controlling AA guns, and the British Radar, Gun Laying, Mark I, was designed to be used on AA gun positions and was in use by 1939.
From the early 1930s eight countries developed radar; these developments were sufficiently advanced by the late 1930s for development work on sound-locating acoustic devices to be generally halted although equipment was retained Furthermore in Britain the volunteer Observer Corps formed in 1925 provided a network of observation posts to report hostile aircraft flying over Britain Initially radar was used for airspace surveillance to detect approaching hostile aircraft However the German Würzburg radar put into use in 1940 was capable of providing data suitable for controlling AA guns and the British Radar Gun Laying Mark I was designed to be used on AA gun positions and was in use by 1939