TXE , (telephone exchange electronic) was a family of telephone exchanges developed by the British General Post Office (GPO), designed to replace the ageing Strowger switches .
207-521: When World War II ended, the UK telephone exchange suppliers supported the GPO's decision to stay with Strowger until a viable electronic system became available. The GPO largely did this to protect their success in the export market, but it actually had the effect of ultimately destroying it. This allowed competitors to develop their own improved switching systems ahead of the GPO. In 1960 the situation rapidly changed when
414-637: A Neutrality Pact in April 1941, and Japan adopted the doctrine of Nanshin-ron , promoted by the Navy, which took its focus southward and eventually led to war with the United States and the Western Allies. In Europe, Germany and Italy were becoming more aggressive. In March 1938, Germany annexed Austria , again provoking little response from other European powers. Encouraged, Hitler began pressing German claims on
621-444: A blunderbuss , each guard carried a secure timepiece by which departure times at each stage of the journey were strictly regulated. In 1830 mail was carried by train for the first time, on the newly-opened Liverpool and Manchester Railway ; over the next decade the railways replaced mail coaches as the principal means of conveyance (the last mail coach departed from London on 6 January 1846). The first Travelling Post Office (TPO)
828-564: A cautious French probe into the Saarland . The Western Allies also began a naval blockade of Germany , which aimed to damage the country's economy and war effort. Germany responded by ordering U-boat warfare against Allied merchant and warships, which would later escalate into the Battle of the Atlantic . On 8 September, German troops reached the suburbs of Warsaw . The Polish counter-offensive to
1035-509: A lottery bond called the Premium Bond was introduced. In the mid-1960s the GPO was asked by the government to expand into banking services which resulted in the creation of the National Giro in 1968. When new forms of communication came into existence in the 19th and early 20th centuries the GPO claimed monopoly rights on the basis that like the postal service they involved delivery from
1242-545: A proclamation 'for the settling of the Letter-office of England and Scotland', an event which 'may properly be regarded as the origin of the British post-office'. By this decree, Thomas Witherings (who had been appointed 'Postmaster of England for foreign parts' three years earlier) was empowered to provide for the carriage of private letters at fixed rates 'betwixt London and all parts of His Majesty's dominions'. To this end,
1449-483: A sender and to a receiver . The theory was used to expand state control of the mail service into every form of electronic communication possible on the basis that every sender used some form of distribution service. These distribution services were considered in law as forms of electronic post offices. This applied to telegraph and telephone switching stations. In 1846, the Electric Telegraph Company ,
1656-659: A bell to attract custom was adopted by the Post Office and went on to be employed in major cities until the mid-19th century. In 1761 permission was given for the establishment of penny-post arrangements elsewhere in the realm, to function along the same lines as the London office, if they could be made financially viable; by the end of the century there were penny-post systems operating in Birmingham, Bristol, Dublin, Edinburgh and Manchester (to be joined by Glasgow and Newcastle-upon-Tyne in
1863-602: A capacity of 3000, with 152 incoming junctions and 166 outgoing junctions. Later, instead of expansion of the TXE1, capacity was increased with three TXE2 exchanges and a TXE6. The exchange was housed in a prototype K-type single-story building on the site of the former Lake House in Lake Street. The construction included thermal insulation panels, double-glazing and under-floor electrical heating. Ventilation arrangements were by eight ventilating units, each handling 600 cu. ft. per min, and
2070-621: A court ruling obliged the London Penny Post to come under the authority of the Postmaster General. Although now part of the GPO, the London Penny Post continued to operate entirely independently of the General (or 'Inland') Post until 1854 (when the two systems were combined). An attempt by Charles Povey to set up a rival halfpenny post in 1709 was halted after several months' operation; however Povey's practice of having letter-carriers ring
2277-514: A digital edge-lit display . Another display gave a visual indication of the traffic flowing through the exchange, named the Hubblemeter after the instigator Ray Hubble. Occasionally the call trace did not work, but the engineers worked out a way of manually tracing a call. What they did was to buy a little compass and glue a piece of magnetic ferrite on the side to pull the compass needle away from north. They would then run this compass along outside of
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#17328546521972484-532: A fee. The trade in these 'ship letters' was acknowledged (and legitimised) in the Post Office Acts of 1657 and 1660. Attempts were made to levy Post Office fees on these letters and 'ship letter money' was offered to captains for each letter given to a postmaster on arrival in England in order for these charges to be applied; however they were under no legal obligation to comply and the majority of ship letters evaded
2691-430: A hand bell. While postmasters were not obliged to deliver items to places outside the boundary, they could agree to do so on payment of an extra fee. In the 1780s, Britain's General Post network was revolutionised by theatrical impresario John Palmer 's idea of using mail coaches in place of the longstanding use of post horses. After initial resistance from the postal authorities, a trial took place in 1784, by which it
2898-409: A horse and cart or waggon, while the universities, along with certain municipal and other corporations, maintained their own correspondence networks. Many letters went by foot-post rather than on horseback. Footposts or runners were employed by many towns, cities and other communities, and had been for many years. A 16th-century footpost would cover around 30 miles per day, on average. At the time of
3105-592: A hundred miles a day. Under King Henry VIII a concerted effort was made to maintain a regular postal system for the conveyance of royal and government despatches (in times of peace as well as in time of war). To oversee the system, the king appointed Brian Tuke to serve as 'Master of the Postes'. By the 1550s five post roads were in place, connecting London with Dover , Edinburgh , Holyhead (via Chester ), Milford Haven (via Bristol ) and Plymouth . (A sixth post road, to Norwich via Colchester , would be added in
3312-477: A maintenance aid, the exchange was equipped with a Maintenance Data Recorder (MDR). This had a rather primitive printer, which displayed the identities of equipment in use at the time that the exchange had detected a call failure. For example, in the event of a successful repeat attempt to provide dial-tone, the MDR would print. If the repeat attempt failed, then the MDR would print twice in quick succession, giving details of
3519-444: A predetermined time the register would be forcibly released and the subscriber put into a parked condition. This was possible because each subscriber had a dual armature line relay, and in the parked condition only the low-current armature was operated. The scanners scanned the subscribers seeking out the ones that had initiated a calling condition by lifting their handset, ignoring any in a parked condition. The scanners were mounted in
3726-514: A pretext to initiate the invasion. The first German attack of the war came against the Polish defences at Westerplatte . The United Kingdom responded with an ultimatum for Germany to cease military operations, and on 3 September, after the ultimatum was ignored, Britain and France declared war on Germany. During the Phoney War period, the alliance provided no direct military support to Poland, outside of
3933-715: A pretext to worsen relations. On 29 August, Hitler demanded that a Polish plenipotentiary immediately travel to Berlin to negotiate the handover of Danzig , and to allow a plebiscite in the Polish Corridor in which the German minority would vote on secession. The Poles refused to comply with the German demands, and on the night of 30–31 August in a confrontational meeting with the British ambassador Nevile Henderson , Ribbentrop declared that Germany considered its claims rejected. On 1 September 1939, Germany invaded Poland after having staged several false flag border incidents as
4140-543: A regular mail-carrying service in exchange for a fee or subsidy. In the following century, packet services out of Falmouth began to sail to the West Indies, North America and other transatlantic destinations. Packet boats, however, were not the only means of conveying letters overseas: there had always been the option of sending them by merchant ship, and coffee houses had long been accustomed to receiving letters and packages on behalf of ships' captains, who would carry them for
4347-506: A regular public postal service came the need for waterborne mail services (carrying letters to and from Ireland, continental Europe and other destinations) to be placed on a more regular footing. ' Packet boats ', offering a regular scheduled mail service, were already in use for the passage between Holyhead and Dublin; but for letters to and from the Continent the post was entrusted to messengers, who would make their own travel arrangements. This
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#17328546521974554-469: A secret protocol that defined German and Soviet "spheres of influence" (western Poland and Lithuania for Germany; eastern Poland , Finland, Estonia , Latvia and Bessarabia for the Soviet Union), and raised the question of continuing Polish independence. The pact neutralised the possibility of Soviet opposition to a campaign against Poland and assured that Germany would not have to face the prospect of
4761-399: A series of "hit-and-miss"-type louvers above the windows on each side of the building provided outlets for heated air. It was withdrawn from service in 1977 when it was replaced by a TXE4. An equipment practice was needed quickly, and it was realised that a matrix of reed relays would be about the same size as a crossbar switch. Therefore, the equipment practice of AT&E's crossbar system
4968-743: A similar pact and rejected ceding part of its territory to the Soviet Union. The Soviet Union invaded Finland in November 1939, and was subsequently expelled from the League of Nations for this crime of aggression. Despite overwhelming numerical superiority, Soviet military success during the Winter War was modest, and the Finno-Soviet war ended in March 1940 with some Finnish concessions of territory . In June 1940,
5175-626: A subsidiary of Plessey , took a different view and continued to urge the GPO to adopt crossbar). At this time, in the US, Bell Labs were developing a system based on electronically controlled reed relays , and this looked promising. One of Ericsson's marketing points for crossbar was that it used precious-metal contacts, but reed relays would be even better as their precious metal contacts were hermetically sealed. Also their very short operating and release times (<1 ms) made them ideal for electronic control, and these reed-electronic exchanges were considered
5382-544: A system for the conveyance of foreign dispatches had been set up, organised by Flemish merchants in the City of London ; but in 1558, after a dispute arose between Italian, Flemish and English merchants on the matter, the Master of the King's Posts was granted oversight of it instead. In 1619, James I appointed a separate Postmaster General 'for foreign parts', granting him (and his appointees)
5589-441: A team of four horses, rather than six as was usual for a stage coach at that time). The long-established practice of 'riding post' was acknowledged through the provision of four seats inside the coach for passengers. The mail bags were carried in a locked box at the back, above which sat a scarlet-coated guard. While the coaches and coachmen were provided by contractors, the guards worked for the Post Office. As well as two pistols and
5796-519: A two-front war, as it had in World War I. Immediately afterwards, Hitler ordered the attack to proceed on 26 August, but upon hearing that the United Kingdom had concluded a formal mutual assistance pact with Poland and that Italy would maintain neutrality, he decided to delay it. In response to British requests for direct negotiations to avoid war, Germany made demands on Poland, which served as
6003-424: Is a matter of general concernment, and of great advantage, as well for the preservation of trade and commerce as otherwise". To begin with the Post Office was again farmed, nominally to Henry Bishop , but the deal was bankrolled by John Wildman (a gentleman of dubious repute, who kept a tight rein on his investment). Two years later Wildman was imprisoned, implicated in a plot against the King, whereupon Bishop sold
6210-588: The Anglo-German Naval Agreement and the German–Polish declaration of non-aggression . The situation became a crisis in late August as German troops continued to mobilise against the Polish border. On 23 August the Soviet Union signed a non-aggression pact with Germany, after tripartite negotiations for a military alliance between France, the United Kingdom, and Soviet Union had stalled. This pact had
6417-662: The British Empire , with fighting in the Balkans , Mediterranean, and Middle East , the aerial Battle of Britain and the Blitz , and naval Battle of the Atlantic . Through a series of campaigns and treaties, Germany took control of much of continental Europe and formed the Axis alliance with Italy , Japan , and other countries. In June 1941, Germany led the European Axis in an invasion of
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6624-567: The GPO , Siemens Brothers (later AEI ), Automatic Telephone & Electric (later Plessey ), the Ericsson Telephones (also later Plessey), General Electric Company (GEC), and Standard Telephones and Cables (STC). STC built the common control, AEI the switching and scanners, line scanning and test console, and AT&E the dialling capturing equipment (registers) and the incoming and outgoing junctions. (A 'junction' in British telephonic terms
6831-471: The GPO , had been working on VF (voice frequency) signalling , using valves (vacuum tubes), and this had led him to realise that valves could be very reliable if not switched on and off. This gave him the confidence during the war to build the world's first digital computer, called Colossus , at Bletchley Park . After the war, the success of Colossus encouraged him to contemplate the possibility of telephone exchanges each using tens of thousands of valves. He
7038-566: The German Revolution of 1918–1919 , and a democratic government, later known as the Weimar Republic , was created. The interwar period saw strife between supporters of the new republic and hardline opponents on both the political right and left. Italy, as an Entente ally, had made some post-war territorial gains; however, Italian nationalists were angered that the promises made by the United Kingdom and France to secure Italian entrance into
7245-814: The German invasion of Poland and the United Kingdom and France 's declaration of war on Germany two days later on 3 September 1939. Dates for the beginning of the Pacific War include the start of the Second Sino-Japanese War on 7 July 1937, or the earlier Japanese invasion of Manchuria , on 19 September 1931. Others follow the British historian A. J. P. Taylor , who stated that the Sino-Japanese War and war in Europe and its colonies occurred simultaneously, and
7452-567: The Italian mainland , and Allied offensives in the Pacific—cost the Axis powers their initiative and forced them into strategic retreat on all fronts. In 1944, the Western Allies invaded German-occupied France at Normandy , while the Soviet Union regained its territorial losses and pushed Germany and its allies westward. At the same time, Japan suffered reversals in mainland Asia, while the Allies crippled
7659-537: The Japanese Navy and captured key islands . The war in Europe concluded with the liberation of German-occupied territories ; the invasion of Germany by the Western Allies and the Soviet Union, culminating in the fall of Berlin to Soviet troops; Hitler's suicide ; and the German unconditional surrender on 8 May 1945 . Following the refusal of Japan to surrender on the terms of the Potsdam Declaration ,
7866-682: The League of Nations as a force to preserve peace. Both Italy and Ethiopia were member nations, but the League did little when the former clearly violated Article X of the League's Covenant . The United Kingdom and France supported imposing sanctions on Italy for the invasion, but the sanctions were not fully enforced and failed to end the Italian invasion. Italy subsequently dropped its objections to Germany's goal of absorbing Austria . When civil war broke out in Spain, Hitler and Mussolini lent military support to
8073-738: The Leeward Islands was enjoined. The Irish post at this time operated as part of the GPO under a Deputy Postmaster General based in Dublin; but in 1784 an Act was passed by the Parliament of Ireland providing for an independent Post Office in Ireland under its own Postmaster General (an arrangement that remained in place until 1831). The established post roads in Britain ran to and from London. The use of other roads required government permission (for example, it
8280-693: The Nationalist rebels , led by General Francisco Franco . Italy supported the Nationalists to a greater extent than the Nazis: Mussolini sent more than 70,000 ground troops, 6,000 aviation personnel, and 720 aircraft to Spain. The Soviet Union supported the existing government of the Spanish Republic . More than 30,000 foreign volunteers, known as the International Brigades , also fought against
8487-677: The Rome–Berlin Axis . A month later, Germany and Japan signed the Anti-Comintern Pact , which Italy joined the following year. The Kuomintang (KMT) party in China launched a unification campaign against regional warlords and nominally unified China in the mid-1920s, but was soon embroiled in a civil war against its former Chinese Communist Party (CCP) allies and new regional warlords . In 1931, an increasingly militaristic Empire of Japan , which had long sought influence in China as
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8694-718: The Royal Mail Steam Packet Company ran ships out of Southampton to the West Indies and South America, the British and North American Royal Mail Steam-Packet Company (aka the Cunard Line ) covered the North Atlantic route, while the Peninsular and Oriental Steam Navigation Company provided services on eastward routes to the Mediterranean, India and Australia. From 1840 vessels carrying mail under Admiralty contract had
8901-581: The Soviet–Japanese Neutrality Pact in April 1941. By contrast, the Germans were steadily making preparations for an attack on the Soviet Union, massing forces on the Soviet border. Hitler believed that the United Kingdom's refusal to end the war was based on the hope that the United States and the Soviet Union would enter the war against Germany sooner or later. On 31 July 1940, Hitler decided that
9108-477: The Spanish Armada every parish was by royal command required to provide a footpost, and every town a horse-post, to help convey news in the event of an imminent invasion. By the early 1600s there were two options for couriers using the post system: they could either ride 'through-post', carrying the correspondence the full distance; or they could use the 'post of the packet', whereby the letters were carried by
9315-580: The Stresa Front in April 1935 in order to contain Germany, a key step towards military globalisation ; however, that June, the United Kingdom made an independent naval agreement with Germany, easing prior restrictions. The Soviet Union, concerned by Germany's goals of capturing vast areas of Eastern Europe , drafted a treaty of mutual assistance with France. Before taking effect, though, the Franco-Soviet pact
9522-614: The Strowger system for small and medium cities and towns. The telephone systems of Jersey and the Isle of Man , obtained from the NTC were offered for sale to the respective governments of the islands. Both initially refused, but the States of Jersey did eventually take control of their island's telephones in 1923. On 27 July 1896, Guglielmo Marconi gave the first demonstration of wireless telegraphy from
9729-523: The Sudetenland , an area of Czechoslovakia with a predominantly ethnic German population. Soon the United Kingdom and France followed the appeasement policy of British Prime Minister Neville Chamberlain and conceded this territory to Germany in the Munich Agreement , which was made against the wishes of the Czechoslovak government, in exchange for a promise of no further territorial demands. Soon afterwards, Germany and Italy forced Czechoslovakia to cede additional territory to Hungary, and Poland annexed
9936-428: The Tanggu Truce was signed in 1933. Thereafter, Chinese volunteer forces continued the resistance to Japanese aggression in Manchuria , and Chahar and Suiyuan . After the 1936 Xi'an Incident , the Kuomintang and CCP forces agreed on a ceasefire to present a united front to oppose Japan. The Second Italo-Ethiopian War was a brief colonial war that began in October 1935 and ended in May 1936. The war began with
10143-466: The Trans-Olza region of Czechoslovakia. Although all of Germany's stated demands had been satisfied by the agreement, privately Hitler was furious that British interference had prevented him from seizing all of Czechoslovakia in one operation. In subsequent speeches Hitler attacked British and Jewish "war-mongers" and in January 1939 secretly ordered a major build-up of the German navy to challenge British naval supremacy. In March 1939, Germany invaded
10350-506: The Treaty of Craiova . The loss of one-third of Romania's 1939 territory caused a coup against King Carol II, turning Romania into a fascist dictatorship under Marshal Ion Antonescu , with a course set towards the Axis in the hopes of a German guarantee. Meanwhile, German-Soviet political relations and economic co-operation gradually stalled, and both states began preparations for war. In April 1940, Germany invaded Denmark and Norway to protect shipments of iron ore from Sweden , which
10557-401: The United Kingdom and France to declare war on Germany. Poland was divided between Germany and the Soviet Union under the Molotov–Ribbentrop Pact , in which they had agreed on " spheres of influence " in Eastern Europe. In 1940, the Soviets annexed the Baltic states and parts of Finland and Romania . After the fall of France in June 1940, the war continued mainly between Germany and
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#173285465219710764-399: The War of the Spanish Succession ). The distribution network was centred on the General Letter Office in London (which was on Threadneedle Street prior to the Great Fire of London , after which it moved first to Bishopsgate and then to Lombard Street in 1678). The incoming post arrived each week on Mondays, Wednesdays and Fridays; it was sorted and stamped : London letters went to
10971-426: The Wehrmacht rapidly advanced to the Channel and cut off the Allied forces in Belgium, trapping the bulk of the Allied armies in a cauldron on the Franco-Belgian border near Lille. The United Kingdom was able to evacuate a significant number of Allied troops from the continent by early June, although they had to abandon almost all their equipment. On 10 June, Italy invaded France , declaring war on both France and
11178-451: The aftermath of World War I and the rise of fascism in Europe and militarism in Japan . Key events leading up to the war included Japan's invasion of Manchuria , the Spanish Civil War , the outbreak of the Second Sino-Japanese War , and Germany's annexations of Austria and the Sudetenland . World War II is generally considered to have begun on 1 September 1939, when Nazi Germany , under Adolf Hitler , invaded Poland , prompting
11385-402: The great powers —participated, with many investing all available economic, industrial, and scientific capabilities in pursuit of total war , blurring the distinction between military and civilian resources. Tanks and aircraft played major roles , with the latter enabling the strategic bombing of population centres and delivery of the only two nuclear weapons ever used in war. World War II
11592-404: The reunification of East and West Germany to take place and resolved most post–World War II issues. No formal peace treaty between Japan and the Soviet Union was ever signed, although the state of war between the two countries was terminated by the Soviet–Japanese Joint Declaration of 1956 , which also restored full diplomatic relations between them. World War I had radically altered
11799-452: The sole privilege of carrying foreign correspondence to and from London. (The separate Postmaster General appointments were consolidated in 1637, but the 'foreign' and 'inland' postal services remained separate in terms of administration and accounting until the mid-19th century). It was not until 1635 that a general or public post was properly established, for inland letters as for foreign ones. On 31 July that year, King Charles I issued
12006-426: The 'windows' where members of the public were able to collect them from the office in person (once they had paid the requisite fee), while 'Country letters' were dispatched along the relevant post road. The outgoing post went on Tuesdays, Thursdays and Saturdays. Postage was payable by the recipient (rather than the sender) and depended on the length of the letter and the distance it had travelled; each individual charge
12213-441: The 1830s). In 1801 the cost of posting a letter within the central London area was doubled; thenceforward the London District Post was known as the 'Two-penny Post' until its amalgamation into the General Post 53 years later. During the reign of King William III , the General Post Office created a network of 'receiving-houses', in London and the larger provincial towns, where senders could submit items. A Scottish Post Office
12420-416: The ASY63 transistors that had nickel–iron connecting wires and would not take the solder, causing dry joints to the circuit cards. This happened over all sections of the electronic equipment in the common control area. The remedy to this problem was to re-solder connections with a solder with a stronger flux. For maintenance, the registers were hinged and could be lowered for easier access. These units, unlike
12627-401: The Admiralty took over managing the long-distance routes out of Falmouth, while services to and from Ireland and the continent were increasingly put out to commercial tender. Eventually, in 1837, the Admiralty took over control of the whole operation (and with it the remaining Post Office vessels). Subsequently, contracts for carrying mail began to be awarded to new large-scale shipping lines :
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#173285465219712834-409: The Allies were attempting to cut off . Denmark capitulated after six hours , and despite Allied support , Norway was conquered within two months. British discontent over the Norwegian campaign led to the resignation of Prime Minister Neville Chamberlain , who was replaced by Winston Churchill on 10 May 1940. On the same day, Germany launched an offensive against France . To circumvent
13041-482: The Australian Postmaster-General's Department rejected a system from a consortium of British manufacturers who offered a register-controlled version of a motor-uniselector system in favour of a crossbar system from LM Ericsson . Suddenly the rules had changed and the race was on to develop an electronic telephone exchange that could operate with the current GPO telephones used in the UK, including shared service . Just before World War II, Tommy Flowers employed at
13248-400: The Axis war against the Soviet Union, in Romania's case partially to recapture territory ceded to the Soviet Union . In early June 1940, the Italian Regia Aeronautica attacked and besieged Malta , a British possession. From late summer to early autumn, Italy conquered British Somaliland and made an incursion into British-held Egypt . In October, Italy attacked Greece , but the attack
13455-421: The Blitz , but largely ended in May 1941 after failing to significantly disrupt the British war effort. Using newly captured French ports, the German Navy enjoyed success against an over-extended Royal Navy , using U-boats against British shipping in the Atlantic . The British Home Fleet scored a significant victory on 27 May 1941 by sinking the German battleship Bismarck . In November 1939,
13662-444: The British Isles (the nations of which had been unified under Oliver Cromwell as a result of the Wars of the Three Kingdoms ), stating that 'there shall be one General Post-Office, and one office stiled the Postmaster-Generall of England and Comptroller of the Post-Office'. The Act also reasserted the postal monopoly for letter delivery and for post-horses; and it set new rates both for carriage of letters and for 'riding post'. During
13869-400: The Commonwealth, what had been a weekly post service to and from London was increased to a thrice-weekly service: letters were despatched from the General Letter Office in London every Tuesday, Thursday and Saturday evening, while the inbound post arrived early in the morning on Mondays, Wednesdays and Fridays. Usually the recipient of the post paid the fee (and had the right to refuse to accept
14076-410: The Crown). At Dover merchant ships were regularly employed to convey letters to and from the continent . A similar system connected Holyhead and Milford to Ireland (and by the end of the 16th century a packet service had been established on the Holyhead to Dublin route). Private citizens could make use of the post-horse network, if they could afford it (in 1583 they had to pay twopence per mile for
14283-405: The European Axis declaring war on the US. Japan conquered much of coastal China and Southeast Asia , but its advances in the Pacific were halted in mid-1942 after its defeat in the naval Battle of Midway ; Germany and Italy were defeated in North Africa and at Stalingrad in the Soviet Union. Key setbacks in 1943—including German defeats on the Eastern Front, the Allied invasions of Sicily and
14490-410: The French possessions of Syria and Lebanon , assisted by the Free French . With the situation in Europe and Asia relatively stable, Germany, Japan, and the Soviet Union made preparations for war. With the Soviets wary of mounting tensions with Germany, and the Japanese planning to take advantage of the European War by seizing resource-rich European possessions in Southeast Asia , the two powers signed
14697-532: The GPO (in particular the Hull Telephones Department (now privatised) and the telephone system of Guernsey ). The GPO took over the company on 1 January 1912; transferring 1,565 exchanges and 9,000 employees at a cost of £12,515,264. The GPO installed several automatic telephone exchanges from several vendors in trials at Darlington on 10 October 1914 and Dudley on 9 September 1916 ( rotary system ), Fleetwood (relay exchange from Sweden), Grimsby (Siemens), Hereford (Lorimer) and Leeds (Strowger). The GPO then selected
14904-516: The GPO came to be viewed less as a revenue-raising body and more as a public service . The Post Office Savings Bank was introduced in 1861, when there were few banks outside major towns. By 1863, 2,500 post offices were offering a savings service . Gradually more financial services were offered by post offices, including government stocks and bonds in 1880, insurance and annuities in 1888, and war savings certificates in 1916. In 1909 old age pensions were introduced, payable at post offices. In 1956
15111-480: The Germans, and the last large operational unit of the Polish Army surrendered on 6 October . Despite the military defeat, Poland never surrendered; instead, it formed the Polish government-in-exile and a clandestine state apparatus remained in occupied Poland. A significant part of Polish military personnel evacuated to Romania and Latvia; many of them later fought against the Axis in other theatres of
15318-505: The Nationalists. Both Germany and the Soviet Union used this proxy war as an opportunity to test in combat their most advanced weapons and tactics. The Nationalists won the civil war in April 1939; Franco, now dictator, remained officially neutral during World War II but generally favoured the Axis . His greatest collaboration with Germany was the sending of volunteers to fight on the Eastern Front . In July 1937, Japan captured
15525-513: The Peace had been ordered to arrange appointment of two to three foot-posts in every parish for the conveyance of letters), though in practice precise details were often left to the local postmaster. On the return journey to London, bags of letters would be picked up from each post-house on the way, and taken to the General Letter Office to be sorted for despatch. With the establishment of
15732-595: The Post Master General obtained a court judgement that telephone conversations were, technically, within the remit of the Telegraph Act. The General Post Office then licensed all existing telephone networks. The effective nationalisation of the UK telecommunications industry occurred in 1912 with the takeover of the National Telephone Company which left only a few municipal undertakings independent of
15939-459: The Post Office.) The expansion of the service beyond the main post-roads was in no small part due to the enterprise of the Deputy post-masters themselves, who were allowed to profit from branch services which they established and operated. In this way, the network of 'by-posts' greatly expanded in the 1670s: in 1673 Blome could write that 'there is scarce any Market-Town of note [which does not have]
16146-486: The Postmaster General. Alongside money orders, postal orders were introduced in 1881, which were cheaper and easier to cash. Postal orders and money orders were vital at this time for transactions between small businesses, as well as individuals, because bank transfer facilities were only available to major businesses and for larger sums of money. In 1840 the Uniform Penny Post was introduced, which incorporated
16353-730: The Research Section of the Telegraph Office, which had its origins in innovative areas of work being pursued by staff in the Engineering Department. In the 1920s a dedicated research station was set up by the GPO seven miles away in Dollis Hill ; during the Second World War the world's first electronic computer, ' Colossus ', was designed and constructed there by Tommy Flowers and other GPO engineers. The Telegraph Office
16560-505: The Royal Navy putting three Italian battleships out of commission after a carrier attack at Taranto , and neutralising several more warships at the Battle of Cape Matapan . Italian defeats prompted Germany to deploy an expeditionary force to North Africa; at the end of March 1941, Rommel 's Afrika Korps launched an offensive which drove back Commonwealth forces. In less than a month, Axis forces advanced to western Egypt and besieged
16767-584: The Soviet Union occupied the entire territories of Estonia, Latvia and Lithuania, as well as the Romanian regions of Bessarabia, Northern Bukovina, and the Hertsa region . In August 1940, Hitler imposed the Second Vienna Award on Romania which led to the transfer of Northern Transylvania to Hungary. In September 1940, Bulgaria demanded Southern Dobruja from Romania with German and Italian support, leading to
16974-690: The Soviet Union , opening the Eastern Front and initially making large territorial gains. Japan aimed to dominate East Asia and the Asia-Pacific , and by 1937 was at war with the Republic of China . In December 1941, Japan attacked American and British territories in Southeast Asia and the Central Pacific , including Pearl Harbor in Hawaii , which resulted in the US and the UK declaring war against Japan, and
17181-621: The Soviet Union and Mongolia . The Japanese doctrine of Hokushin-ron , which emphasised Japan's expansion northward, was favoured by the Imperial Army during this time. This policy would prove difficult to maintain in light of the Japanese defeat at Khalkin Gol in 1939, the ongoing Second Sino-Japanese War and ally Nazi Germany pursuing neutrality with the Soviets. Japan and the Soviet Union eventually signed
17388-738: The Soviet Union should be eliminated and aimed for the conquest of Ukraine , the Baltic states and Byelorussia . However, other senior German officials like Ribbentrop saw an opportunity to create a Euro-Asian bloc against the British Empire by inviting the Soviet Union into the Tripartite Pact. In November 1940, negotiations took place to determine if the Soviet Union would join the pact. The Soviets showed some interest but asked for concessions from Finland, Bulgaria, Turkey, and Japan that Germany considered unacceptable. On 18 December 1940, Hitler issued
17595-536: The TXE2 exchanges. Production contracts were awarded simultaneously to Plessey, STC and GEC. Some 2–3,000 TXE2s went into service with the GPO, the last one being withdrawn from service on 23 June 1995. The Pentex system, which evolved beyond TXE2, was exported to over 30 countries and was largely responsible for Plessey winning the Queen's Award for Exports in 1978. Because of their common control design, isolation (inability of
17802-608: The TXE3 equipment was broken up and supplied to universities for observation. World War II Asia-Pacific Mediterranean and Middle East Other campaigns Coups World War II or the Second World War (1 September 1939 – 2 September 1945) was a global conflict between two coalitions: the Allies and the Axis powers . Nearly all the world's countries —including all
18009-473: The Test Call would raise its own prompt alarm if it detected 31 sequential call-attempt failures, indicating that neither security side of the exchange was able to connect calls. As a further security measure, if the first attempt to set up a path to a register failed, so that, on an outgoing call, the customer did not get dial-tone, the exchange recognised the failure, stored the details of the equipment in use on
18216-455: The UK. The responsibility for the 'electric telegraphs' was officially transferred to the GPO in 1870. Overseas telegraphs did not fall within the monopoly. The private telegraph companies that already existed were bought out. The new combined telegraph service had 1,058 telegraph offices in towns and cities and 1,874 offices at railway stations. 6,830,812 telegrams were transmitted in 1869 producing revenue of £550,000. London's Central Office in
18423-402: The US dropped the first atomic bombs on Hiroshima and Nagasaki on 6 and 9 August. Faced with an imminent invasion of the Japanese archipelago , the possibility of further atomic bombings, and the Soviet declaration of war against Japan and its invasion of Manchuria , Japan announced its unconditional surrender on 15 August and signed a surrender document on 2 September 1945 , marking
18630-568: The United Kingdom and France guaranteed their support for Polish independence ; when Italy conquered Albania in April 1939, the same guarantee was extended to the Kingdoms of Romania and Greece . Shortly after the Franco - British pledge to Poland, Germany and Italy formalised their own alliance with the Pact of Steel . Hitler accused the United Kingdom and Poland of trying to "encircle" Germany and renounced
18837-538: The United Kingdom attacked on 3 July in an attempt to prevent its seizure by Germany. The air Battle of Britain began in early July with Luftwaffe attacks on shipping and harbours . The German campaign for air superiority started in August but its failure to defeat RAF Fighter Command forced the indefinite postponement of the proposed German invasion of Britain . The German strategic bombing offensive intensified with night attacks on London and other cities in
19044-455: The United Kingdom. The Germans turned south against the weakened French army, and Paris fell to them on 14 June. Eight days later France signed an armistice with Germany ; it was divided into German and Italian occupation zones , and an unoccupied rump state under the Vichy Regime , which, though officially neutral, was generally aligned with Germany. France kept its fleet, which
19251-640: The United States was assisting China and the Western Allies, and had amended the Neutrality Act to allow "cash and carry" purchases by the Allies. In 1940, following the German capture of Paris, the size of the United States Navy was significantly increased . In September the United States further agreed to a trade of American destroyers for British bases . Still, a large majority of the American public continued to oppose any direct military intervention in
19458-590: The Yellow River ; this manoeuvre bought time for the Chinese to prepare their defences at Wuhan , but the city was taken by October. Japanese military victories did not bring about the collapse of Chinese resistance that Japan had hoped to achieve; instead, the Chinese government relocated inland to Chongqing and continued the war. In the mid-to-late 1930s, Japanese forces in Manchukuo had sporadic border clashes with
19665-714: The ability to convert a subscriber's directory number into an equipment location identity. This was a considerable innovation in British exchanges since in Strowger exchanges the directory and equipment numbers had to be the same. The switching in TXE2s was carried out by reed relays and a typical TXE2 contained about 100,000 reeds. The reeds were fast in operation, with a life expectancy of more than 10 million operations. The glass capsules were about an inch (25 mm) in length and about an eighth of an inch (3 mm) in diameter. Four reeds were generally present inside each relay coil, two for
19872-475: The benefit of the conveyance of letters to and fro'; he went on to list, County by County, both the 'Stages' on the post-roads (of which there were over 140) and the Post-towns on the branch roads (which by then numbered over 380 in total), where members of the public were able to leave letters with a Post-Master 'to be sent as directed'. Before long moves were made to incorporate the by-posts (and their income) into
20079-502: The capital Nanking in December 1937. After the fall of Nanking, tens or hundreds of thousands of Chinese civilians and disarmed combatants were murdered by the Japanese . In March 1938, Nationalist Chinese forces won their first major victory at Taierzhuang , but then the city of Xuzhou was taken by the Japanese in May. In June 1938, Chinese forces stalled the Japanese advance by flooding
20286-476: The common control, were hard-wired. However, a unit could be changed by breaking straps at the rear and then rewiring them. A subscriber was connected to the local register using the normal reed switching as the local registers were connected to the C switches. However, they were hard-wired to the common control translator. AT&E and STC created testers so that parts of the exchange could be taken out of service and connected to testers. The testers then simulated
20493-476: The common-control areas of the exchange, it could give rise to the exchange becoming isolated (being unable to set up any calls) for as much as several hours. These faults were very difficult to locate and in the end, the problems were only resolved by a fairly substantial re-reeding programme carried out on the common-control units of the early Plessey exchanges. The STC reeds proved to be more reliable, but, if they failed, they tended to stick or short-circuit. This
20700-403: The conflict well into 1941. In December 1940, Roosevelt accused Hitler of planning world conquest and ruled out any negotiations as useless, calling for the United States to become an " arsenal of democracy " and promoting Lend-Lease programmes of military and humanitarian aid to support the British war effort; Lend-Lease was later extended to the other Allies, including the Soviet Union after it
20907-463: The country. The 1850s also saw the widespread introduction of red-painted post boxes where the public could deposit their outgoing mail. Few other organisations (either of state or of commerce) could rival the early Victorian Post Office in the extent of its national coverage. Its counters began to be relied upon for providing other government services (e.g. the issuing of licences of various types); and increasingly (and significantly) in this period,
21114-515: The creation of a " New Roman Empire ". Adolf Hitler , after an unsuccessful attempt to overthrow the German government in 1923, eventually became the Chancellor of Germany in 1933 when Paul von Hindenburg and the Reichstag appointed him. Following Hindenburg's death in 1934, Hitler proclaimed himself Führer of Germany and abolished democracy, espousing a radical, racially motivated revision of
21321-766: The critical common control units would be forced to change from the side in service (A or B) to the other side, the automatic 8-minute changeover would be suspended and a prompt alarm would be sent out. In TXE2s, a call which terminated within the same exchange went through seven switching stages, whereas a call going out to another exchange went through just three switching stages. The switches were designated as A, B, C and D (the paths were A-B-C for outgoing, A-B-C-D-C-B-A for internal and D-C-B-A for incoming). The common control equipment consisted of B- and C-switch selectors, supervisory selectors (a supervisory relay set stayed in-circuit throughout each call), Register Selectors, Registers and Call Control. The most characteristic feature of
21528-410: The dialling, and there were three sorts of registers: loop-disconnect , MF (later called DTMF ), and incoming. There were about 20 local registers and 12 incoming registers. The local registers (loop-disconnect and MF) took care of own-exchange and outgoing calls, while the incoming registers dealt with calls coming into the exchange. A local register would provide dial tone to the subscriber, wait for
21735-471: The directive to prepare for an invasion of the Soviet Union. General Post Office The General Post Office ( GPO ) was the state postal system and telecommunications carrier of the United Kingdom until 1969. Established in England in the 17th century, the GPO was a state monopoly covering the dispatch of items from a specific sender to a specific receiver (which was to be of great importance when new forms of communication were invented); it
21942-739: The dissolution of the Austro-Hungarian, Ottoman, and Russian Empires. To prevent a future world war, the League of Nations was established in 1920 by the Paris Peace Conference . The organisation's primary goals were to prevent armed conflict through collective security, military, and naval disarmament , as well as settling international disputes through peaceful negotiations and arbitration. Despite strong pacifist sentiment after World War I , irredentist and revanchist nationalism had emerged in several European states. These sentiments were especially marked in Germany because of
22149-417: The early 17th century.) Each post-house on the road was staffed by a postmaster , whose main responsibility was to provide the horses; he would also provide a guide to accompany the messenger as far as the next post house (and then see to the return of the horses afterwards). In practice most post-houses were established at roadside inns and the innkeeper served as postmaster (in return for a small salary from
22356-536: The early years of the system's service, the performance of the reeds proved to be worse than had been expected. The TXE2-specific equipment was different in the TXE2s manufactured by Plessey, STC and GEC, so that spare equipment had to be held for each type of manufacturer. Importantly, each manufacturer made their own reed inserts (reed were manufactured for GEC by their subsidiary, the Mazda Osram Valve Company) and their performance differed significantly in
22563-637: The end of May completed the German conquest of the Balkans. Partisan warfare subsequently broke out against the Axis occupation of Yugoslavia , which continued until the end of the war. In the Middle East in May, Commonwealth forces quashed an uprising in Iraq which had been supported by German aircraft from bases within Vichy-controlled Syria . Between June and July, British-led forces invaded and occupied
22770-463: The end of the war. World War II changed the political alignment and social structure of the world, and it set the foundation of international relations for the rest of the 20th century and into the 21st century. The United Nations was established to foster international cooperation and prevent conflicts, with the victorious great powers—China, France, the Soviet Union, the UK, and the US—becoming
22977-433: The equipment in use on both the failed paths. The prints were not easy to read. All that emerged were short burn marks on the special paper in up to 45 different places in each of two rows. It was necessary to hold a plastic graticule (see picture below right, under that of an MDR) over the paper to find out what the presence of each burn mark indicated. If more than eight call failures were detected in less than 8 minutes, then
23184-597: The establishment of the Penny Post, the only location where letters could be posted in London was the General Letter Office in Lombard Street .) The receiving-houses were often found in public houses, coffee houses or other retail premises. Deliveries were made six or eight times a day in central London (and a minimum of four times a day in the outskirts). The innovation was a great success, and within two years
23391-408: The exchange to set up calls) of the entire exchange was always a possibility and very occasionally happened. This potential weakness had been at least partially recognised in the design of the exchange type, so the most critical common control units were split into three sections and each section was duplicated into an A-side and a B-side. In the event of the equipment detecting a serious fault in one of
23598-399: The exchange up to an acceptable standard of service, as it had been standing idle for several years. TXE3 was a cost reduced and improved version of TXE1 designed for exchanges with more than 2,000 subscribers. The same three companies that built the TXE1 developed TXE3, namely STC, AEI and AT&E, and it was intended to be the standard BPO system for large exchanges. The prototype exchange
23805-407: The exchange's central control unit design was that calls were processed serially. Consequently, call set-up had to be fast. In particular, Call Control had to become free in less than the time of the inter-digital pause on calls incoming to the exchange. This time could be as low as 60 milliseconds. As the TXE2 call-set-up time was some 50 milliseconds, this design requirement was just met, but even so,
24012-498: The extra charges. In 1680 William Dockwra and Robert Murray founded the 'Penny Post', which enabled letters and parcels to be sent cheaply to and from destinations in and around London. A flat fee of a penny was charged for sending letters or parcels up to a pound in weight within an area comprising the City of London, the City of Westminster and the Borough of Southwark ; while two-pence
24219-437: The failed call and automatically made a second attempt, using different equipment. This happened so quickly (about 50 milliseconds) that, if the second attempt was successful, the customer would not have been aware of the failed first attempt to get dial-tone. Unlike the preceding rural Strowger exchanges (UAX 13s and smaller) the TXE2s were equipped with an uninterruptible power supply with auto-starting diesel generators. As
24426-417: The first decade of nationalized telegraphy created two levels of service. High-status circuits catering to the state, international trade, sporting life, and imperial business. Low-status circuits directed toward the local and the provincial. These distinct telegraphic orbits were connected to different types of telegraph instruments operated by differently gendered telegraphists. 1909 saw the establishment of
24633-409: The first dialled digit, and then apply to the translator to see what action was required. The translator could decide by the first digit if it was a local call, and if it was it would instruct the register to come back when it had all the digits. If it was not a local call and therefore to be routed out of the exchange, then it would tell the register to come back with each digit until it could decide on
24840-461: The first exchange had been manufactured with a 9,600 capacity and was being installed on site at Royal exchange in London in 1968 when GEC made a takeover bid for AEI. The takeover bid was successful and GEC decided that they preferred the crossbar system to TXE3 and promptly cancelled the contract to supply TXE3 to the BPO. Royal first exchange was dismantled before its installation had been completed and all
25047-566: The first step of what its government saw as the country's right to rule Asia , staged the Mukden incident as a pretext to invade Manchuria and establish the puppet state of Manchukuo . China appealed to the League of Nations to stop the Japanese invasion of Manchuria. Japan withdrew from the League of Nations after being condemned for its incursion into Manchuria. The two nations then fought several battles, in Shanghai , Rehe and Hebei , until
25254-498: The first years of production. All the TXE2-specific equipment was mounted on slide-in units, mainly single-width, but some double-width. There was a structured holding of maintenance spare units. For those which were likely to be needed frequently or urgently in every exchange, such as a Subscribers Line Unit, a spare unit was held in every exchange. For those units for which a spare was likely to be needed less frequently or urgently,
25461-843: The former Chinese imperial capital of Peking after instigating the Marco Polo Bridge incident , which culminated in the Japanese campaign to invade all of China. The Soviets quickly signed a non-aggression pact with China to lend materiel support, effectively ending China's prior cooperation with Germany . From September to November, the Japanese attacked Taiyuan , engaged the Kuomintang Army around Xinkou , and fought Communist forces in Pingxingguan . Generalissimo Chiang Kai-shek deployed his best army to defend Shanghai , but after three months of fighting, Shanghai fell. The Japanese continued to push Chinese forces back, capturing
25668-412: The guides from one post house to the next in a cotton-lined leather bag (although this method was only available for royal, government or diplomatic correspondence). The guides at this time were provided with a post horn , which they had to sound at regular intervals or when encountering others on the road (other road users were expected to give way to the post riders ). At the start of the 16th century
25875-503: The horse, plus fourpence per stage for the guide), but it was primarily designed for the relaying of state and royal correspondence, or for the conveyance from one place to another of individuals engaged on official state business (who paid a reduced rate). Private correspondence was often sent using common carriers at this time, or with others who regularly journeyed from place to place (such as travelling pedlars ); towns often made use of local licensed carriers, who plied their trade using
26082-478: The inhabitants of the nation. At that time there were 182 Deputy Post-Masters (or 'Deputies') in England [and Wales], most of whom were stationed at the 'Stages' or stops which lay along the six main post-roads; and under them were sub-Post-masters , based at market towns which were not on the main post-roads but to which the service had been extended. (The sub-Post-masters, unlike the Deputies, were not employed by
26289-512: The invasion of the Ethiopian Empire (also known as Abyssinia ) by the armed forces of the Kingdom of Italy ( Regno d'Italia ), which was launched from Italian Somaliland and Eritrea . The war resulted in the military occupation of Ethiopia and its annexation into the newly created colony of Italian East Africa ( Africa Orientale Italiana , or AOI); in addition it exposed the weakness of
26496-516: The item if they did not wish to pay); the charge was based on the distance the item had been carried so the Post Office had to keep a separate account for each item. After the Restoration , the Post Office Act 1660 ( 12 Cha. 2 . c. 35) was passed (the previous Cromwellian Act being void), confirming the arrangements in place for the Post Office, and the post of Postmaster General, and emphasizing
26703-526: The latter's accession to the throne as King James II , this income became part of the hereditary revenues of the Crown ; and subsequently, under the growing scrutiny of HM Treasury , the postal service came increasingly to be viewed as a source of government income (as seen in the Post Office (Revenues) Act 1710 , which increased postal charges and levied tax on the income in order to finance Britain's involvement in
26910-566: The lease on to the King's gunpowder manufacturer, Daniel O'Neill ; after the latter's death, his widow the Countess of Chesterfield served out the remainder of the original seven-year term (so becoming the first female Postmaster General). Meanwhile, under the terms of a 1663 Act of Parliament, the 'rents, issues and profits' of the Post Office had been settled by the King on his brother, the Duke of York, to provide for his support and maintenance. Following
27117-492: The length of journey required it). Under Edward IV , however, a more efficient system was put in place (albeit temporarily) to aid communications during his war with Scotland : a number of post houses were established at twenty-mile intervals along the Great North Road , between London and Berwick , to provide the king's messengers with fresh horses for each stage of the journey; in this way they were able to travel up to
27324-517: The mail bags from one post-house to the next; the postmaster at the next post-house would then record the time of arrival, before transferring the bags to a new horse, ridden by a new post-boy, for the next stage of the journey. On the outbound journey from London, the mail for each Stage (and its associated Post-towns) was left at the relevant post-house. Arrangements for its onward delivery varied somewhat from place to place. Witherings had envisaged using 'foot-posts' for this purpose (in 1620 Justices of
27531-585: The main type of memory used in the TXE2 (and the TXE4) was particularly characteristic of the general design philosophy, that the components used had to be of a technology that had been tested over many years. The choice thus went to the Dimond ring type of memory, named after T. L. Dimond of Bell Laboratories, who invented in 1945. They were large-diameter magnetic ferrite toroidal rings with solenoid windings, through which are threaded writing and reading wires. These racks gave
27738-407: The mains supply, backed up by a diesel generator. The exchange proved reasonably reliable, although it did have a few outages. Most of these were caused in the common control area. The common control equipment was divided into functional units, and each unit was duplicated, an A side and a B side, and each section was isolated by means of reed relays. Under either fault conditions or manual control or
27945-509: The medieval period, nobles generally employed messengers to deliver letters and other items on their behalf. In the 12th century a permanent body of messengers had been formed within the Royal Household of King Henry I , for the conveyance of royal and official correspondence. The messengers delivered their messages in person, each travelling on his own horse and taking time as needed for rest and refreshment (including stopping overnight if
28152-512: The messengers appointed by the said Thomas Witherings', thus establishing a monopoly, which (under the auspices of the Royal Mail ) would remain in place until 2006. Under the Commonwealth the Post Office was farmed to John Manley and John Thurloe , successively. In 1657 an Act of Parliament entitled Postage of England, Scotland and Ireland Settled set up a postal system for the whole of
28359-406: The most practical switching system to proceed with at the time and electronic enough, until a truly electronic system could be developed, although Tommy Flowers did not approve as he advocated going straight to a digital system. The manager at AEI (W G Patterson) decided that reed-electronic space-division switching was the way to go, and it was then that the term 'TXE'(Telephone exchange electronic)
28566-501: The national network: 'Riding Surveyors' were appointed in 1682, to travel with the post and scrutinise the Deputies' income and activity at each Stage (particularly in relation to by-letters); in later years the Surveyors served as the GPO's inspectorate , tasked with maintaining efficiency and consistency across the network (until they were finally disbanded in the 1930s). It was usual for each postmaster to employ post-boys to ride with
28773-558: The network of post towns served by the General Post, and at the same time did much to reform its workings. In 1772 the Court of the King's Bench ruled that letters ought to be delivered directly to recipients within the boundaries of each post town at no additional cost. Often a messenger with a locked satchel would be employed by the postmaster to deliver and receive items of mail around town; he would alert people to his presence by ringing
28980-548: The new arrangement, the King commanded 'all his postmasters, upon all the roads of England, to have ready in their stables one or two horses [...] to carry such messengers, with their portmantles , as shall be imployed in the said service', and they were forbidden from hiring out these horses to others on days when the mail was due. Furthermore, it was enjoined that (with a few specific exceptions) 'no other messenger or messengers, footpost or footposts, shall take up, carry, receive or deliver any letter or letters whatsoever, other than
29187-409: The number of customers might be reduced to 75. The earlier (Mark I and Mark II – the differences being slight) exchanges could handle up to 2,000 customers. Later on, Mark III TXE2s were able to handle up to 4,000 customers and on these exchanges, where the average calling rate was sufficiently low, up to 250 customers would be in an A-switch group, still with access to just 25 A-B trunks. The choice of
29394-619: The operation of three of these exchanges, serving perhaps some 5,000–6,000 customers in total. In the summer of 2005 a demonstration rack of TXE2 equipment was transferred to the Connected Earth collection at Milton Keynes Museum . There is a working MXE2 (mobile variant) at Avoncroft Museum . It can be used to make calls within the museum. Many of the MXE2s ended up in Northern Ireland. Only one of these ever had to be used 'in anger'. This
29601-424: The outgoing junction units. The exchange had some advanced features for the time, including multi-frequency (MF) tone dialling as an option opposed to pulse dialling, and no post-dialling delay for own exchange calls. It also had the ability to detect a switching failure and automatically attempt a repeat dial. Any repeat attempts were logged to the teleprinter. It also had a test console, which monitored all calls on
29808-479: The overall capacity of the system was determined by the probability of an incoming call being delayed too long in its initial connection to a register. The grade of service in a TXE2 was dependent on the number of customers in an A-switch group, with access to just 25 A-B trunks. The normal standard on the earlier exchanges was 125 customers per A-switch group. If the A-switch group contained many busy PBX lines, then
30015-436: The packet ship services. Since the 1780s these had been run on behalf of the Post Office by private contractors, who depended on supplementary income from fee-paying passengers in order to make a profit; but in the 19th-century steamships began to lure the passengers away. At some considerable cost the Post Office resolved to build and operate its own fleet of steam vessels, but the service became increasingly inefficient. In 1823
30222-497: The permanent members of its security council . The Soviet Union and the United States emerged as rival superpowers , setting the stage for the Cold War . In the wake of European devastation, the influence of its great powers waned, triggering the decolonisation of Africa and Asia . Most countries whose industries had been damaged moved towards economic recovery and expansion . World War II began in Europe on 1 September 1939 with
30429-571: The political European map with the defeat of the Central Powers —including Austria-Hungary , Germany , Bulgaria , and the Ottoman Empire —and the 1917 Bolshevik seizure of power in Russia , which led to the founding of the Soviet Union. Meanwhile, the victorious Allies of World War I , such as France, Belgium, Italy, Romania, and Greece, gained territory, and new nation-states were created out of
30636-427: The port of Tobruk . By late March 1941, Bulgaria and Yugoslavia signed the Tripartite Pact ; however, the Yugoslav government was overthrown two days later by pro-British nationalists. Germany and Italy responded with simultaneous invasions of both Yugoslavia and Greece , commencing on 6 April 1941; both nations were forced to surrender within the month. The airborne invasion of the Greek island of Crete at
30843-457: The predetermined time, the unit indicated would change over to its partner. The changeover of the relays was controlled by a series of reed relays whose reed inserts were wetted with mercury. Periodically over some weeks, the mercury would migrate to the point of contact of the blades, leaving a mercuric bead giving “ON” and both A and B sides into service. The confusion generated caused the exchange to be isolated. There were also some problems with
31050-415: The privilege of being badged and designated as Royal Mail Ships (RMS). In 1838 the Money Order Office was established, to provide a secure means of transferring money to people in different parts of the country (or world), and to discourage people from sending cash by post. The money order system had first been introduced as a private enterprise by three Post Office clerks in 1792, with the permission of
31257-422: The public and economic benefits of a General Post system: "Whereas for the maintenance of mutual correspondencies, and prevention of many inconveniences happening by private posts, several public post-offices have been heretofore erected for carrying and recarrying of letters by post to and from all parts and places within England, Scotland, and Ireland, and several posts beyond the seas, the well-ordering whereof
31464-412: The racks of the associated switching units and fed back information so that a register could be switched to the subscriber to provide dial tone. There were three outgoing junctions per shelf, and they could be busied by using the keys that can be seen in the photograph. The TXE1 required power supplies of −18 V, +50 V and −50 V DC. These were provided by lead–acid batteries charged from
31671-528: The reed relays, and when a relay was operated the needle would move back to north. This was repeated over several sets of the switching path until the trace was complete. Inter-rack cabling was via a cable loft. The cables were routed up through packed pass-throughs into a reinforced ceiling. A novel but subsequently disastrous feature designed by Bell Antwerp was used to hold the subscriber's class of service information i.e. PBX, shared service, incoming calls barred (ICB), temporary out of service (TOS) etc. This
31878-422: The registers to store. They used the X, Y and auxiliary switching planes. Incoming registers used a time-shared electronic dial path ( TDM ) to transfer pulsing information from the incoming junction to the incoming register. This feature was necessary to ensure that no pulsing information was lost. In the event of a cable breakdown or similar event which may result in permanent loops on subscribers lines, after
32085-407: The remainder of Czechoslovakia and subsequently split it into the German Protectorate of Bohemia and Moravia and a pro-German client state , the Slovak Republic . Hitler also delivered an ultimatum to Lithuania on 20 March 1939, forcing the concession of the Klaipėda Region , formerly the German Memelland . Greatly alarmed and with Hitler making further demands on the Free City of Danzig ,
32292-460: The rest of the realm). Witherings was required to extend the new system to other post roads 'as soon as possibly may be' (beginning with the routes to Oxford and Bristol, and to Colchester, Norwich and Yarmouth); and provision was also made for the establishment of 'bye-posts' to run to and from places not directly served by the post road system (such as Lincoln and Hull). The new system was fully and profitably running by 1636. In order to facilitate
32499-432: The roof of the Telegraph Office in St. Martin's Le Grand. The development of radio links for sending telegraphs led to the Wireless Telegraphy Act 1904 , which granted control of radio waves to the General Post Office, who licensed all senders and receivers. This placed the Post Office in a position of control over radio and television broadcasting as those technologies were developed. By 1900 house-to-house mail delivery
32706-421: The routing, as not all calls went to the GSC (Group Switching Centre) as there was AAR (alternative available routing). Once the routing had been decided and digits passed on, the register was free to take another call. The MF senders/receivers were used when an MF subscriber initiated a call. They were set up to the subscribers line and switching network to an MF register, they converted the MF tones to pulses for
32913-455: The royal proclamation instructed him to establish 'a running post, to run night and day', initially between London and Edinburgh, London and Holyhead and London and Plymouth, 'for the advancement of all His Majesty's subjects in their trade and correspondence'. (A similar system, running between London and Dover, had already been established by Witherings as part of his administration of the foreign posts, and he himself had proposed its extension to
33120-542: The side-conscious units onto the other side, locked that side in service and raised a prompt alarm. In periods of very low traffic, there would typically be fewer than eight call set-up attempts on the exchange in eight minutes and this would have prevented the above security system from working. The exchange was therefore provided with an automatic Test Call Unit, which originated a test call every 30 seconds. As well as thus enabling Call Control to detect eight failures in less than eight minutes (if all call-attempts were failing),
33327-445: The side-conscious units, all the units in that section were locked onto the side which was giving good service and a prompt alarm was sent to a manned centre to indicate that the exchange needed urgent attention. In normal service, the exchange automatically changed all three sections from one side to the other every eight minutes. If Call Control detected eight failures to set up calls within that eight minutes, then it force-changed all
33534-423: The signals that the exchange would send to it, and in this way individual parts of the exchange could be tested. The prototype for the exchange which the GPO called TXE2 was a system called Pentex (the Plessey trademark for all non-GPO sales), which, starting in 1963, was developed by Ericsson Telephones , as part of Plessey. The first field trial of Pentex started in the Peterborough Telephone Area in 1965. There
33741-410: The significant territorial, colonial, and financial losses imposed by the Treaty of Versailles . Under the treaty, Germany lost around 13 percent of its home territory and all its overseas possessions , while German annexation of other states was prohibited, reparations were imposed, and limits were placed on the size and capability of the country's armed forces . The German Empire was dissolved in
33948-493: The spares were held at an Area centre serving perhaps 6–10 TXE2s of the same manufacture. Finally for those units for which a spare was likely to be needed seldom, the spare units were held at one centre per Region - there being ten Regions in the UK. In the early (around 1969) Plessey exchanges, a significantly high proportion of the reed-inserts were contaminated with a high-resistance film and were prone to giving an intermittently high-resistance contact. If this occurred in one of
34155-484: The speech-path, one for holding the path and one for metering. Switching with these reeds held out the prospect of much greater reliability compared with the Strowger system, where switching was carried out by base metal wipers moving through banks of metal contacts. The Strowger switches required routines to be carried out on them to clean the banks: they also required oiling and occasional adjustment. Reed relays required none of this. However, in practice, and particularly in
34362-442: The start of the 21st century the Post Office became a public limited company (initially called 'Consignia plc'), which was renamed ' Royal Mail Group plc' in 2002. In 2012 the counters business (known as ' Post Office Limited ' since 2002) was taken out of Royal Mail Group, prior to the latter's privatisation in 2013. The privatised holding company (Royal Mail plc) was renamed International Distributions Services plc in 2022. In
34569-447: The start or prelude to World War II. The exact date of the war's end also is not universally agreed upon. It was generally accepted at the time that the war ended with the armistice of 15 August 1945 ( V-J Day ), rather than with the formal surrender of Japan on 2 September 1945, which officially ended the war in Asia . A peace treaty between Japan and the Allies was signed in 1951. A 1990 treaty regarding Germany's future allowed
34776-443: The strips by wire was a common practice for subscribers who were constantly changing their Class of Service, i.e. being made TOS. This information was then pulsed by the common control translator and appropriate action taken. In the end the problem turned out to be cable interference requiring substantial re-cabling at the rear of the rack. This system was replaced in later TXE exchanges by Dimond rings . The registers looked after all
34983-415: The strong Maginot Line fortifications on the Franco-German border, Germany directed its attack at the neutral nations of Belgium , the Netherlands , and Luxembourg . The Germans carried out a flanking manoeuvre through the Ardennes region, which was mistakenly perceived by the Allies as an impenetrable natural barrier against armoured vehicles. By successfully implementing new Blitzkrieg tactics,
35190-427: The subsequent failure of Highgate Wood, it was necessary for the British manufacturers to come up with something different until a fully digital system could be developed (this eventually turned out to be System X and System Y ). Ericsson had twenty years of experience of manufacturing the crossbar system and reducing its cost, so there was no point in trying to compete with them (Plessey Telecommunications,
35397-471: The successor of the GPO Telegraph and Telephones department. In 1980, the telecommunications and postal sides were split prior to British Telecommunications ' conversion into a totally separate publicly owned corporation the following year as a result of the British Telecommunications Act 1981 . In 1986 the Post Office Counters business was made functionally separate from Royal Mail Letters and Royal Mail Parcels (the latter being rebranded as ' Parcelforce '). At
35604-469: The system would be too expensive for the competitive export market, so AEI split its team into two: one to do whatever the BPO wanted and the other to produce a reduced version for export. The trial was started in April 1968 and the model worked very well at Armour House and the BPO ordered the first half dozen exchanges. Jim Warman moved his team back from Blackheath to Woolwich to start a new department with its own manufacturing and marketing. The equipment for
35811-607: The technology of the time: the solid-state switching worked well, but the analogue transmission (which had worked on the short cable runs of a laboratory model at Dollis Hill) was too noisy for public service on the long cable runs of a large exchange. However, the principles would be used later, as transmission became digital, in the development of digital exchanges the world over, including System X . Siemens Brothers (later taken over by Associated Electrical Industries , who renamed each section accordingly e.g. AEI Telecoms) had set up an electronic switching lab at Blackheath . This lab
36018-415: The two key innovations of a uniform postal rate, which cut administrative costs and encouraged use of the system, and adhesive pre-paid stamp. Packets (weighing up to 16 ounces (450 g)) could also be sent by post, the cost of postage varying with the weight. The reforms were devised and overseen by Rowland Hill , having been initially proposed in Parliament by Robert Wallace MP . A book post service
36225-415: The two wars became World War II in 1941. Other proposed starting dates for World War II include the Italian invasion of Abyssinia on 3 October 1935. The British historian Antony Beevor views the beginning of World War II as the Battles of Khalkhin Gol fought between Japan and the forces of Mongolia and the Soviet Union from May to September 1939. Others view the Spanish Civil War as
36432-423: The units that could be withdrawn and AT&E and AEI did not. It turned out that the connectors used were reliable and they had a great advantage in fault finding. It also allowed the STC engineers to place a suspect faulty unit in an outrigger so it could be tested in situ. One of the functions of the common control was to decide which was the best connection to be used through the switching network, and this part
36639-407: The war were not fulfilled in the peace settlement. From 1922 to 1925, the Fascist movement led by Benito Mussolini seized power in Italy with a nationalist, totalitarian , and class collaborationist agenda that abolished representative democracy, repressed socialist, left-wing, and liberal forces, and pursued an aggressive expansionist foreign policy aimed at making Italy a world power, promising
36846-475: The war. Germany annexed western Poland and occupied central Poland ; the Soviet Union annexed eastern Poland ; small shares of Polish territory were transferred to Lithuania and Slovakia . On 6 October, Hitler made a public peace overture to the United Kingdom and France but said that the future of Poland was to be determined exclusively by Germany and the Soviet Union. The proposal was rejected and Hitler ordered an immediate offensive against France, which
37053-404: The west halted the German advance for several days, but it was outflanked and encircled by the Wehrmacht . Remnants of the Polish army broke through to besieged Warsaw . On 17 September 1939, two days after signing a cease-fire with Japan , the Soviet Union invaded Poland under the supposed pretext that the Polish state had ceased to exist. On 27 September, the Warsaw garrison surrendered to
37260-483: The world order , and soon began a massive rearmament campaign . France, seeking to secure its alliance with Italy, allowed Italy a free hand in Ethiopia , which Italy desired as a colonial possession. The situation was aggravated in early 1935 when the Territory of the Saar Basin was legally reunited with Germany, and Hitler repudiated the Treaty of Versailles, accelerated his rearmament programme, and introduced conscription. The United Kingdom, France and Italy formed
37467-411: The world's first public telegraph company, was established in the UK and developed a nationwide communications network. Several other private telegraph companies soon followed. The Telegraph Act 1868 granted the Postmaster General the right to acquire inland telegraph companies in the United Kingdom and the Telegraph Act 1869 conferred on the Postmaster General a monopoly in telegraphic communication in
37674-554: Was invaded by Germany. The United States started strategic planning to prepare for a full-scale offensive against Germany. At the end of September 1940, the Tripartite Pact formally united Japan, Italy, and Germany as the Axis powers . The Tripartite Pact stipulated that any country—with the exception of the Soviet Union—that attacked any Axis Power would be forced to go to war against all three. The Axis expanded in November 1940 when Hungary , Slovakia , and Romania joined. Romania and Hungary later made major contributions to
37881-455: Was a capacitor store , and it held information on a thin plastic strip, into which could be inserted up to 10 little copper squares which had a capacitance of 10 pF . The thin plastic strips were then inserted into the Data Store rack, one at the position representing the directory number and another at the position representing the equipment number. This can be seen in the photograph together with some plastic strips hanging by wire. Hanging
38088-431: Was adopted for the TXE1 apart from the common control, which had its own equipment practice. The common control consisted of 14 racks and made up a complete suite of the exchange. It was made entirely from discrete components as integrated circuits were not yet in common use. There was much discussion by all contractors as to whether there was a reliable connector available to make units interchangeable. STC decided to have
38295-414: Was also a cause of isolations early on, but a simple modification restricted the most serious type of failure to a small part of the exchange. The GEC/MOV reeds proved to be the most reliable of all. Once the teething troubles had been largely dealt with, which was not until about 1974, the TXE2s realised more of their expected benefits and it was eventually not uncommon for one Technical Officer to maintain
38502-448: Was another trial site at Leamington. The system was designed to serve 200–1,200 customers and about 240 Erlang units . It was therefore mainly used to replace the larger rural Strowger exchanges – usually UAX13s. The first TXE2 was installed at Ambergate , some 20 miles from the Plessey factory at Beeston , and opened on 15 December 1966. Although the system had been developed by Plessey, the GPO had insisted on competitive tendering for
38709-428: Was at Castlewellan about 1990, when the exchange was blown up by terrorists. The typical set-up time for an MXE2 was about six weeks, but at Castlewellan, full telephone service was restored using an MXE2 (and the additional use of a mobile transmission unit designed by Northern Ireland staff) within one week of the bombing. It did, however, take a lot of subsequent work by the switch maintenance Technical Officers to get
38916-404: Was built and tested in the Circuit Laboratory at Armour House. The trial period was for 200 subs, 100 were for senior engineers within Telecoms HQ the remaining 100 subs were transferred from Monarch exchange, in the City of London, on a temporary basis (via c/o switches in case something went wrong). The trial lasted from 1969 until 1970. During the development of the TXE3 it became apparent that
39123-478: Was calculated in London and entered into a book, which went with the letters on the road, indicating the amounts due from each postmaster for the letters delivered into his care. At first the new postal network was not especially well publicised; but in his 1673 publication Britannia , Richard Blome sought to remedy this by describing in some detail the geographical disposition of the new 'general Post-Office' , which he called an 'exceeding great conveniency' for
39330-679: Was called the route choice. The interrogators would return the available paths and the route choice would make a choice and tell the markers to mark that route. The exchange used reed relays as the switching medium, and the reeds themselves were approximately 3 inches in length and the only ones available. They were provided by the Hivac subsidiary of AT&E (then the only UK manufacturer of reed inserts.) It had multi-stage switching divided into A, B and C switches, interconnected by links. A typical local call would be connected via A-B-C-Link-C-B-A. Links could each either have or not have transmission bridges for local calls. The bridges were contained within
39537-413: Was charged for items posted or delivered in the surrounding 'country' area (which included places such as Hackney, Newington, Lambeth and Islington). The Penny Post letter-carriers operated from seven main sorting offices around London, which were supplemented by between four and five hundred 'receiving houses' in all the principal streets in the area, where members of the public could post items. (Prior to
39744-458: Was coined, even although the reed relays themselves were not regarded as electronic components. A much bigger team was needed to undertake the detailed development and AEI persuaded AT&E and STC to join them in the work. The initial result of their work was a prototype system called TXE1. The TXE1 was developed by three members of the Joint Electronic Research Committee (JERC) which was formed in 1956 and lasted until 1969. The JERC consisted of
39951-436: Was demonstrated that a mail coach departing from Bristol at 4pm would regularly arrive in London at 9 o'clock the following morning: a day and a half quicker than the post horses. As a result, the conveyance of letters by mail coach, under armed guard, was approved by Act of Parliament. Mail coaches were similar in design to the passenger-carrying stage coaches , but were smaller, lighter and more manoeuvrable (being pulled by
40158-436: Was established in 1695 (although the post-road to Edinburgh continued to be managed from London); in 1710 the Scottish and English establishments were united by statute . By virtue of the same Act of Parliament (the Post Office (Revenues) Act 1710 ), the functions of the 'general letter office and post office' in the City of London were set out, and the establishment of 'chief letter offices' in Edinburgh, Dublin, New York and
40365-436: Was far from reliable, so in the 1630s Thomas Witherings set about establishing a regular Dover-Calais packet service. By the end of the century additional packet services had been established between Harwich (off the Yarmouth post road) and Helvoetsluys , between Dover and Ostend / Nieuport , and between Falmouth and Corunna . The packet services were generally arranged by contract with an agent, who would commit to provide
40572-431: Was headed by John Flood, who had been a founder member of Tommy Flowers' electronic switching team at Dollis Hill. In the Siemens team was an engineer called Jim Warman . It was his trunking ideas (sectionalisation, serial trunking, line scanning, route choice, repeat attempt etc.), which were to be central to the development of the British TXE exchanges. Following the failure to win major contracts in Australia in 1960 and
40779-408: Was introduced in 1837, and these began to be widely used enabling mail to be sorted in transit; TPO operation was greatly aided by the invention in 1852 of a trackside ' mail-bag apparatus ' which enabled bags to be collected and deposited en route . By the 1860s the Post Office had contracts with around thirty different rail companies. The development of marine steam propulsion inevitably affected
40986-417: Was introduced in 1848, and parcel post in 1883; that same year the term 'letter-carrier' was replaced with ' postman ' in the GPO's official nomenclature. By the 1850s the postal system was described as having become 'universal all over the three kingdoms: no village, however insignificant, being without its receiving-house'. In 1855 a network of 920 post offices and 9,578 sub-offices were in place around
41193-517: Was not a junction in the everyday sense, but the name given to the pair of wires connecting a call between a satellite exchange and the main exchange.) The development of the TXE1 started around 1963. There were models of the AEI equipment at Blackheath and the ATE equipment at Edge Lane , Liverpool . AEI called TXE1 their REX (reed electronic exchanges). Completion was delayed but the TXE1 went into service in 1968 in Leighton Buzzard . Although designed to handle 10,000 subscribers, it started out with
41400-434: Was only after much lobbying that a 'cross-post' between Bristol and Exeter was authorised, in 1698; previously mail between the two cities had to be sent via London). In 1720 Bath postmaster Ralph Allen , who had a vision for improving the situation, took over responsibility for the cross-posts (i.e. routes connecting one post road to another) and bye-posts (connecting to places off the main post roads). He greatly expanded
41607-430: Was overseen by a Government minister , the Postmaster General . Over time its remit was extended to Scotland and Ireland, and across parts of the British Empire . The GPO was abolished by the Post Office Act 1969 , which transferred its assets to the Post Office , so changing it from a Department of State to a statutory corporation . Responsibility for telecommunications was given to Post Office Telecommunications ,
41814-403: Was postponed until the spring of 1940 due to bad weather. After the outbreak of war in Poland, Stalin threatened Estonia , Latvia , and Lithuania with military invasion, forcing the three Baltic countries to sign pacts allowing the creation of Soviet military bases in these countries; in October 1939, significant Soviet military contingents were moved there. Finland refused to sign
42021-657: Was repulsed with heavy Italian casualties; the campaign ended within months with minor territorial changes. To assist Italy and prevent Britain from gaining a foothold, Germany prepared to invade the Balkans, which would threaten Romanian oil fields and strike against British dominance of the Mediterranean. In December 1940, British Empire forces began counter-offensives against Italian forces in Egypt and Italian East Africa . The offensives were successful; by early February 1941, Italy had lost control of eastern Libya, and large numbers of Italian troops had been taken prisoner. The Italian Navy also suffered significant defeats, with
42228-441: Was required to go through the bureaucracy of the League of Nations, which rendered it essentially toothless. The United States, concerned with events in Europe and Asia, passed the Neutrality Act in August of the same year. Hitler defied the Versailles and Locarno Treaties by remilitarising the Rhineland in March 1936, encountering little opposition due to the policy of appeasement . In October 1936, Germany and Italy formed
42435-494: Was slightly damaged by a German bomb in 1917 and in 1940, was set alight during the London Blitz , destroying much of the interior. It reopened in 1943. By the 1950s, the volume of telegraph traffic had declined and the Telegraph Office closed in 1963. In 1984 the new British Telecom Centre was opened on the site. The Post Office commenced its telephone business in 1878, however the vast majority of telephones were initially connected to independently run networks. In December 1880,
42642-480: Was the deadliest conflict in history, resulting in 70 to 85 million deaths , more than half being civilians. Millions died in genocides , including the Holocaust of European Jews, as well as from massacres, starvation, and disease. Following the Allied powers' victory, Germany , Austria , Japan , and Korea were occupied, and war crimes tribunals were conducted against German and Japanese leaders . The causes of World War II included unresolved tensions in
42849-417: Was told that this was impossible and he could not say he had already done it with Colossus because he was bound by the Official Secrets Act . However, a fully electronic prototype Time-Division Multiplex Model Exchange was constructed at the Post Office Research Station at Dollis Hill and then an experimental TDM exchange system was built and tested at Highgate Wood in 1962, but it was found to be beyond
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