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Plotters were employed on an early form of air traffic monitoring that played a vital role in World War II, including during the Battle of Britain, The Blitz and the bombing of British cities that followed. They worked at individual RAF stations' Sector Control Rooms or in the central Group Control Rooms that directed the operations of RAF fighters. The majority of plotters were female, members of the Women's Auxiliary Air Force (WAAFs). [1]
Captain Philip Edward Broadley Fooks transferred from the Royal Garrison Artillery to the Anti-Aircraft Defences, Home Forces in June 1918 and he suggested displaying the latest information graphically on a large horizontal map at central London control near Horse Guards in Spring Gardens. This map was marked with a grid upon which different-shaped and annotated pieces representing the airborne forces were colour coded to the clocks to distinguish fresh from older information and were manipulated with wooden rakes by operators guided by information read to them from the incoming reports from field observers and acoustic detectors. [2] : 93–94
By World War II the control room (depicted in countless films) was essentially the same as in World War I, however, by then plotting depended on reports from the newly installed Chain Home radar stations that detected aircraft approaching the coastline, and the Royal Observer Corps posts that spotted hostile and friendly aircraft over land.
Such reports were fed to a Filter Room, where Filter Plotters processed the mass of incoming data by hand and fed a digest to the underground Operations (Ops) room. [3] There, information about aircraft movements was passed to a large number of plotters stationed around a giant table bearing a map of the section. Details about the number of aircraft, their position, height and bearings were transferred to counters that were positioned and moved around the map by the plotters, in a similar way to a croupier at a roulette table, using plotting rods that were adjustable in length and magnetised to pick up the plots.
Each plotter was responsible for aircraft movements in a particular sector, changing the plots regularly so that the whole picture of a raid could be monitored by the Group controllers who were stationed in a gallery above the plotting table.
RAF Northolt is a Royal Air Force station in South Ruislip, 2 nautical miles from Uxbridge in the London Borough of Hillingdon, western Greater London, England, approximately 6 mi (10 km) north of Heathrow Airport. The station handles many private civil flights in addition to Air Force flights. Northolt has one runway in operation, spanning 1,687 m × 46 m, with a grooved asphalt surface. This airport is used for government and VIP transport to and from London.
RAF Bentley Priory was a non-flying Royal Air Force station near Stanmore in the London Borough of Harrow. It was the headquarters of Fighter Command in the Battle of Britain and throughout the Second World War. During the war, two enemy bombs destroyed a wooden hut near the married quarters, a blast from a V-1 flying bomb broke a few windows, the windows in the Officers' Mess were shattered by a V-2 rocket, and a Vickers Wellington crashed outside the Sergeants' Mess.
RAF Uxbridge was a Royal Air Force (RAF) station in Uxbridge, within the London Borough of Hillingdon, occupying a 44.6-hectare (110-acre) site that originally belonged to the Hillingdon House estate. The British Government purchased the estate in 1915, three years before the founding of the RAF. Until the outbreak of the Second World War in 1939, the station was open to the public.
RAF West Drayton was a non-flying Royal Air Force station in West Drayton, within the London Borough of Hillingdon, which served as the main centre for military air traffic control in the United Kingdom. It was co-located with the civilian London Air Traffic Control Centre to provide a vital link between civil and military flying and airspace requirements. Following the departure of the remaining civil and military air traffic control systems by 2008, the site was closed and demolished for a new residential development.
The Women's Auxiliary Air Force (WAAF), whose members were referred to as WAAFs, was the female auxiliary of the British Royal Air Force during World War II. Established in 1939, WAAF numbers exceeded 181,000 at its peak strength in 1943, with over 2,000 women enlisting per week.
Ground-controlled interception (GCI) is an air defence tactic whereby one or more radar stations or other observational stations are linked to a command communications centre which guides interceptor aircraft to an airborne target. This tactic was pioneered during World War I by the London Air Defence Area organization, which became the Royal Air Force's Dowding system in World War II, the first national-scale system. The Luftwaffe introduced similar systems during the war, but most other combatants did not suffer the same threat of air attack and did not develop complex systems like these until the Cold War era.
RAF Rudloe Manor, formerly RAF Box, was a Royal Air Force station located north-east of Bath, England, between the settlements of Box and Corsham, in Wiltshire. It was one of several military installations in the area and covered three dispersed sites. The sites are now used by Defence Digital.
The Royal Auxiliary Air Force (RAuxAF), formerly the Auxiliary Air Force (AAF), together with the Air Force Reserve, is a component of His Majesty's Reserve Air Forces. It provides a primary reinforcement capability for the regular service, and consists of paid volunteers who give up some of their weekends, evenings and holidays to train at one of a number of squadrons around the United Kingdom. Its current mission is to provide trained personnel in support of the regular RAF.
Adlertag was the first day of Unternehmen Adlerangriff, which was the codename of a military operation by Nazi Germany's Luftwaffe to destroy the British Royal Air Force (RAF). The operation came after Britain rejected all overtures for a negotiated peace with Germany. However, Adlertag and subsequent operations failed to destroy the RAF or gain local air superiority.
Bankstown Bunker, formerly known as Air Defence Headquarters Sydney, is a heritage-listed defunct Royal Australian Air Force (RAAF) operations facility, located on the corner of Marion and Edgar Street, in Condell Park, New South Wales, Australia. It was designed by the Allied Works Council and built from 1943 to 1944 by Stuart Bros Pty Ltd of Sydney. It is also known as Air Defence Headquarters Ruin Sydney (former), No. 1 Fighter Section Headquarters, 1FSHQ, Bankstown Bunker and RAAF No. 1 Installation Bankstown; No. 101 Fighter Sector. It was added to the New South Wales State Heritage Register on 18 November 2011.
Royal Air Force Barton Hall or more simply RAF Barton Hall is a former Royal Air Force station situated between the villages of Barton and Broughton, near Preston, Lancashire, England.
A Sector clock or colour change clock was a round colour-coded clock used at military airfields and observation posts in the United Kingdom to help track the movements of enemy aircraft and control friendly aircraft.
Ramsey Grammar School is a coeducational comprehensive secondary school located in Ramsey, on the Isle of Man.
The Dowding system was the world's first wide-area ground-controlled interception network, controlling the airspace across the United Kingdom from northern Scotland to the southern coast of England. It used a widespread dedicated land-line telephone network to rapidly collect information from Chain Home (CH) radar stations and the Royal Observer Corps (ROC) in order to build a single image of the entire UK airspace and then direct defensive interceptor aircraft and anti-aircraft artillery against enemy targets. The system was built by the Royal Air Force just before the start of World War II, and proved decisive in the Battle of Britain.
RAF Blakelaw was a Royal Air Force station which acted as headquarters for No.13 Group during the Second World War and which was located in Blakelaw, Northumberland.
The Battle of Britain Bunker is an underground operations room at RAF Uxbridge, formerly used by No. 11 Group Fighter Command during the Second World War. Fighter aircraft operations were controlled from there throughout the War but most notably during the Battle of Britain and on D-Day. Today it is run by Hillingdon Council as a heritage attraction with attached museum. The museum was opened in 1985, with an above ground visitor centre opened in March 2018.
Eileen Muriel Younghusband, BEM was a filter officer in the Women's Auxiliary Air Force in World War II. She worked in the filter room, a top-level British air defence hub which assessed radar reports in order to give air raid warnings. Later, while posted to Belgium, she was part of a team of mathematicians who alerted Allied forces to the location of V-2 rocket launch sites.
A Filter Room was part of RAF Fighter Command's radar defence system in Britain during the Second World War. The filter room at Fighter Command Headquarters lay at the top of the Dowding system - the integrated ground-controlled interception network that covered the United Kingdom.
Pip-squeak was a radio navigation system used by the British Royal Air Force during the early part of World War II. Pip-squeak used an aircraft's voice radio set to periodically send out a 1 kHz tone which was picked up by ground-based high-frequency direction finding receivers. Using three HFDF measurements, observers could determine the location of friendly aircraft using triangulation.
The RAF Training Flying Control Centre was an early form of Aircraft Area Control Centre, the first of its kind in the world. It was situated at Ramsey Grammar School, Isle of Man.