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Sector Clock
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 coordinate and control air defences. Overview Developed in the United Kingdom during the First World War and originally known as "colour change clocks", the Royal Flying Corps (RFC) introduced sector clocks in 1917 to aid in the chronological monitoring and position plotting of German aircraft. During the Second World War sector clocks played a significant role in the Battle of Britain as part of the Dowding system of air defence and continued to be used by the Royal Air Force (RAF) and Royal Observer Corps (ROC) as simple clocks and keepsakes until the end of the Cold War. Two versions of the sector clock were supplied for issue by the Air Ministry; the RAF sector clock having a " King's Crown" RAF Warrant Officer's insignia under the "24", the ROC issue clock having no associated insigni ...
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World War II RAF Sector Clock
The world is the totality of entities, the whole of reality, or everything that exists. The nature of the world has been conceptualized differently in different fields. Some conceptions see the world as unique, while others talk of a "plurality of worlds". Some treat the world as one simple object, while others analyze the world as a complex made up of parts. In scientific cosmology, the world or universe is commonly defined as "the totality of all space and time; all that is, has been, and will be". Theories of modality talk of possible worlds as complete and consistent ways how things could have been. Phenomenology, starting from the horizon of co-given objects present in the periphery of every experience, defines the world as the biggest horizon, or the "horizon of all horizons". In philosophy of mind, the world is contrasted with the mind as that which is represented by the mind. Theology conceptualizes the world in relation to God, for example, as God's creation, ...
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Militaria
Militaria, also known as military memorabilia, are military equipment which are collected for their historical significance. Such items include firearms, swords, sabres, knives, bayonets, helmets and other equipment such as uniforms, military orders and decorations and insignia. The act of collecting militaria has roots in souvenir hunting, a practice first made popular among soldiers during World War I. During the war, soldiers would walk through battlefields and trenches, taking military equipment and personal items from enemy POW's or, in most cases, dead bodies. Soldiers would send these items home to loved ones through post or in their belongings upon going home. Militaria collecting became nationalized during and at the end of World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powe ...
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Clock Designs
A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year. Devices operating on several physical processes have been used over the millennia. Some predecessors to the modern clock may be considered "clocks" that are based on movement in nature: A sundial shows the time by displaying the position of a shadow on a flat surface. There is a range of duration timers, a well-known example being the hourglass. Water clocks, along with sundials, are possibly the oldest time-measuring instruments. A major advance occurred with the invention of the verge escapement, which made possible the first mechanical clocks around 1300 in Europe, which kept time with oscillating timekeepers like balance wheels., pp. 103–104., p. 31. Traditionally, in horology (the study of timekeeping), the term ''clock'' was us ...
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Battle Of Britain Bunker
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. The Bunker is located at RAF Uxbridge, not far from Uxbridge town centre and Uxbridge Underground station. Background As the location of No. 11 Group RAF's Operations Room, The Battle of Britain Bunker was one of the key parts of the world's first integrated air defence system. Often known as the "Dowding system" (after Air Chief Marshal Sir Hugh Dowding, Commander-in-Chief Fighter Command at the time of installation), the system linked Fighter Command with Anti-Aircraft Command, Barrage Balloon Command, the Observer ...
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Watch Strap
A watch strap, watch band, watch bracelet or watch belt is a bracelet that straps a wrist watch onto the wrist. Watch straps may be made of leather, plastic, polyurethane, silicone, rubber, FKM, cloth, or metal, sometimes in combination. It can be regarded as a fashion item, serving both a utilitarian and decorative function. Some metal watch straps may be metal plating, plated with, or even in rare cases made of, precious metals. Types Watch straps may close with a buckle or a folding clasp. Expanding watch straps are designed to expand elastically, often by the use of metal springs in a segmented design, and may be slipped on like a bracelet. Attachment points for the strap to the watch are largely standardized, with a spring bar (a spring-loaded double-ended pin) used to anchor the watch strap to holes in a bracket that is integral to the watch case, allowing worn watch straps to be replaced or swapped with new straps for fashion purposes. Hook-and-loop fastener, Velcro wat ...
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RAF Bentley Priory
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. The Royal Air Force station closed its operations on 30 May 2008, with all units relocating to new accommodation at RAF Northolt, a few miles away. The station incorporated Bentley Priory, which was originally built in 1766. Since its closure, the Officers' Mess has converted into the Bentley Priory Museum with exhibits focusing on the house's role in the Battle of Britain. The grounds have been redeveloped as a private residential housing estate. History Early history In early 1926, the Bentley Priory estate, which dates from 1766, was broken up and the Priory building and 40 acres (comprising the present grounds) were sold to the Air Ministry for a sum thought to be about £25,000. On 26 May 1926, Air Defence of Great Britain (ADGB) was formed at Hillingdon Ho ...
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RAF Fighter Command
RAF Fighter Command was one of the commands of the Royal Air Force. It was formed in 1936 to allow more specialised control of fighter aircraft. It operated throughout the Second World War, winning fame during the Battle of Britain in 1940. The command continued until November 1943, when it was disbanded and the RAF fighter force was split into two categories, defence and attack. The defensive force became Air Defence of Great Britain (ADGB) and the offensive force became the RAF Second Tactical Air Force. ADGB was renamed Fighter Command in October 1944 and continued to provide defensive patrols around Britain. It was disbanded for the second time in 1968, when it was subsumed by the new Strike Command. Origins On 20 May 1926, the forerunner of Fighter Command was established as a group within Inland Area. On 1 June, Fighting Area was transferred to the Air Defence of Great Britain. Fighting Area was raised to command status in 1932 and renamed Fighter Command on 1 May ...
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Bromley, Kent
Bromley is a large town in Greater London, England, within the London Borough of Bromley. It is southeast of Charing Cross, and had an estimated population of 88,000 as of 2023. Originally part of Kent, Bromley became a market town, chartered in 1158. Its location on a coaching route and the opening of a railway station in 1858 were key to its development and the shift from an agrarian village to an urban town. As part of the growth of London's conurbation in the 20th century, Bromley Town significantly increased in population and was incorporated as a municipal borough in 1903 and became part of the London Borough of Bromley in 1965. Bromley today forms a major retail and commercial centre. It is identified in the London Plan as one of the 13 metropolitan centres of Greater London. History Bromley is first recorded in an Anglo-Saxon charter of 862 as ''Bromleag'' and means 'woodland clearing where broom grows'. It shares this Old English etymology with Great Bromley in ...
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RAF Digby
Royal Air Force Digby otherwise known as RAF Digby is a Royal Air Force List of Royal Air Force stations, station located near Scopwick and south east of Lincoln, Lincolnshire, Lincoln, in Lincolnshire, England. The station is home to the tri-service Joint Service Signals Organisation, part of the Defence Intelligence#Joint Forces Intelligence Group (JFIG), Joint Forces Intelligence Group of Strategic Command (United Kingdom), Strategic Command. Other units include the RAF Aerial Erector School, No. 54 Signals Unit and No. 591 Signals Unit. Formerly an RAF training and fighter airfield, it is one of the country's older Royal Air Force stations, predated only by RAF Northolt, which is the oldest and predates the Royal Air Force by three years, having opened in 1915. Flying at Digby ceased in 1953. History First World War There are dated photographs that show that the airfield was already in use for flying training by Royal Naval Air Service, Royal Naval pilots in the summer of ...
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Ordnance Survey National Grid
The Ordnance Survey National Grid reference system (OSGB), also known as British National Grid (BNG), is a system of geographic grid references, distinct from latitude and longitude, whereby any location in Great Britain can be described in terms of its distance from the origin (0, 0), which lies to the west of the Isles of Scilly. The Ordnance Survey (OS) devised the national grid reference system, and it is heavily used in its survey data, and in maps based on those surveys, whether published by the Ordnance Survey or by commercial map producers. Grid references are also commonly quoted in other publications and data sources, such as guide books and government planning documents. A number of different systems exist that can provide grid references for locations within the British Isles: this article describes the system created solely for Great Britain and its outlying islands (including the Isle of Man). The Irish grid reference system is a similar system created by the ...
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24 Hour Time
The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from to , with as an option to indicate the end of the day. This system, as opposed to the 12-hour clock, is the most commonly used time notation in the world today, and is used by the international standard ISO 8601. A number of countries, particularly English speaking, use the 12-hour clock, or a mixture of the 24- and 12-hour time systems. In countries where the 12-hour clock is dominant, some professions prefer to use the 24-hour clock. For example, in the practice of medicine, the 24-hour clock is generally used in documentation of care as it prevents any ambiguity as to when events occurred in a patient's medical history. Description A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where h ...
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Clock Face
A clock face is the part of an analog clock (or watch) that displays time through the use of a flat dial (measurement), dial with reference marks, and revolving pointers turning on concentric shafts at the center, called hands. In its most basic, globally recognized form, the periphery of the dial is numbered 1 through 12 indicating the hours in a 12-hour cycle, and a short hour hand makes two revolutions in a day. A long minute hand makes one turn (geometry), revolution every hour. The face may also include a ''second hand'', which makes one revolution per minute. The term is less commonly used for the time display on digital clocks and digital watch, watches. A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour clock, 24-hour time. This is similar to the 12-hour dial above, except it has hours numbered 1–24 (or 0–23) around the outside, and the hour hand makes only one revolution per day. Some special-p ...
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