The Air Defence Experimental Establishment (ADEE) was a civil agency run by the British

War Office The War Office has referred to several British government organisations throughout history, all relating to the army. It was a department of the British Government responsible for the administration of the British Army between 1857 and 1964, at ...

, the civilian side of the

British Army The British Army is the principal Army, land warfare force of the United Kingdom. the British Army comprises 73,847 regular full-time personnel, 4,127 Brigade of Gurkhas, Gurkhas, 25,742 Army Reserve (United Kingdom), volunteer reserve perso ...

. It was primarily tasked with developing

sound ranging In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the ''reception'' of such waves and their ''perception'' by the ...

of enemy

artillery Artillery consists of ranged weapons that launch Ammunition, munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during sieges, and l ...

, and the development of

anti-aircraft Anti-aircraft warfare (AAW) is the counter to aerial warfare and includes "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It encompasses surface-based, subsurface ( submarine-launched), and air-ba ...

weapons and techniques, notably

searchlight A searchlight (or spotlight) is an apparatus that combines an extremely luminosity, bright source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a part ...

s. It was originally formed as the Searchlight Experimental Establishment (SLEE) at

Woolwich Woolwich () is a town in South London, southeast London, England, within the Royal Borough of Greenwich. The district's location on the River Thames led to its status as an important naval, military and industrial area; a role that was mainta ...

in 1917 out of a group within the Experimental Section of the

Royal Engineers The Corps of Royal Engineers, usually called the Royal Engineers (RE), and commonly known as the ''Sappers'', is the engineering arm of the British Army. It provides military engineering and other technical support to the British Armed Forces ...

. In 1923 it moved to

RAF Biggin Hill London Biggin Hill Airport is a minor commercial airport serving Biggin Hill in the London Borough of Bromley, located south-southeast of Central London. It specialises in general aviation, handling a spectrum of traffic from private aviati ...

and in 1924 was renamed the Air Defence Experimental Establishment. In 1939 it moved to

Christchurch, Dorset Christchurch () is a town and civil parish on the south coast of Dorset, England. The parish had a population of 31,372 in 2021. It adjoins Bournemouth to the west, with the New Forest to the east. Part of the Historic counties of England, hist ...

. In 1941 it was joined by another development group known simply as the "Army Cell" that had been working on

radar Radar is a system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track ...

systems at Bawdsey Manor. The two groups were merged to become the Air Defence Research and Development Establishment (ADRDE). The radar groups from the

Air Ministry 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 and civil aviation that existed from 1918 to 1964. It was under the political authority of the ...

, by this time known as the

Telecommunications Research Establishment The Telecommunications Research Establishment (TRE) was the main United Kingdom research and development organisation for radio navigation, radar, infra-red detection for heat seeking missiles, and related work for the Royal Air Force (RAF) ...

(TRE), moved to nearby

Swanage Swanage () is a coastal town and civil parish in the south east of Dorset, England. It is at the eastern end of the Isle of Purbeck and one of its two towns, approximately south of Poole and east of Dorchester, Dorset, Dorchester. In the Unit ...

that same year.

References

* Military research establishments of the United Kingdom 20th-century military history of the United Kingdom Radar {{Mil-hist-stub