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World War 1&2 Communications



The Role of the Royal Engineer Signal Service

In 1912 the Royal Engineer Signal Service was formed and made responsible for the visual, telegraph, telephone, signal despatch and later wireless communications from HQ down to Brigades and for artillery communications down to Batteries.

However, throughout most of the Great War the primary means of communications were visual, telegraph and despatch. Most despatch was either by runner or horseback.

The development of the military telephone and wireless

By the outbreak of WWI the army had a small number of wireless sets. These were mainly spark transmitters which operated on long wave and were cumbersome, heavy and unreliable. In 1914 the Royal Flying Corps had begun to use wireless to direct artillery fire. An example of the Marconi transmitter which would fit into an aircraft and send morse signal to be picked up on the ground is held in the Museum. In 1915 trench sets were involved on the western front but were not a great success, partly because the enemy could easily overhear the messages. A trench reconstruction can be seen in the Museum.



A considerable amount of cable and line was used in the war. It was constantly being damaged by shell fire and movement of troops. The MARK 236 was self contained with its own instrument, calling generator, night bell and speaking set. two or more could be set up in tandem to increase the number of subscribers. Having given excellent service until 1918 it went on to serve during the Second World War. The UC was a portable field switchboard which had 10 discreet units. This allowed for repair of one unit without disturbing the remaining subscribers.

At the beginning of the war civilian telephones were pressed into front line services. However, they were not designed to operate in damp, muddy conditions. The telephone D Mark III became the standard army field telephone an example of which is displayed in the Museum. It incorporated a buzzer unit and a morse key so it could be used to send and receive morse if the circuit was too noisy for voice transmissions.



The main types of visual signalling were flags, lamps and lights, and heliograph.

Begbie Lamp


In the foreground of the picture is the large Begbie Lamp on a tripod.

This is a paraffin burning lamp that was used from 1880 until 1915. The lens concentrated the light so that it could be used over great distances.

Signalling Flags


Signalling flags were normally in blue and white as shown. There were variations in the length of the poles and the size and material from which the flags were made. These variations affected the speed at which the operators could send their message. Silk (lightweight) flags, with which a competent operator could reach about 12 words per minute,were used to send the fastest messages.

Trench Signalling Lamp



The Trench Signalling lamp (Seen in the photograph in left centre) was in a wooden case and was battery operated. It had a bulls eye lens to concentrate the light and had a morse key to switch the lamp on and off. It was used mainly for local use from trench to trench and operators would receive the message through a periscope or telescope. It was always extremely dangerous to transmit towards the front of the battlefield as this would attract enemy rifle fire.



The Royal Signals with the British Expeditionary Force

When the Second World War broke out, the Army was ill equipped. Royal Signals units went to France with the British Expeditionary Force in 1939. Some of the Signallers were not fully trained and much of the equipment was obsolescent.
In 1940 the civilian telephone system was used in France and Belgium as messages were less likely to be intercepted this way.

The Western Desert Campaign

The North African campaign was fast moving and Royal Signal units had to lay and retrieve telephone cables and establish wireless links at great speed. Lessons learnt in the desert proved invaluable in the mobile warfare which followed the Normandy landing in June 1944. An Armoured Command Vehicle (ACV) equipped with signalling units and used throughout campaigns in North Africa and Italy can be viewed in the Museum.

The War in the Far East

Over 100,000 Allied Prisoners Of War were held by the Japanese in appalling conditions. Lieutenant Tom Douglas built an illicit receiver while a Prisoner Of War at Burma Railway. It helped keep POW's informed of the events of the War and is now held in the Museum along with various artefacts brought back to Britain by POWs.



As the Allies moved through North West Europe, Royal Signals laid hundreds of miles of telephone and telegraph cables and made use of civilian networks wherever possible. Communications to the United Kingdom were made via a cable laid under the Channel connected to signal stations at Bayeaux and Cherbourg.

The No. 10 set made use of newly developed radar techniques to carry eight channels over any obstacles between land and line links. Numerous radio sets are on display in the Museum including the original No. 10 set.

Visual Signalling

Although visual signalling was generally unsuitable for trench warfare because the operator had to show himself, the heliograph, flags and lamps, all of which can be seen on display, had an important communications role, particularly where the army was moving too quickly to establish a telephone network.

In 1915 signalling discs and shutters were introduced which could be operated from cover and read using a periscope.

The Great War & Telegraph Troop

Telegraph Troop was formed as a mounted unit and horses were used as draft animals until 1937. A life size model of a horse carrying an early military wireless stands in the Museum. Dogs were trained to carry messages between trenches and horses, mules and dogs were all used in war to lay cables.

Pigeons have been used to carry messages since the Greeks. The British Army had Pigeons bringing back messages from the front line. Stories of heroic pigeons such as Pigeon 2709 and William of Orange can be read about in the Animals in War Section and items such as the parachute used by pigeons and medals awarded to pigeons for outstanding flight, can be seen in this display.

At various periods during the war there were over 20,000 pigeons and 370 pigeoneers in the war zone. Very often pigeons were the sole means of communication.

Encryption, Interception and Spy Radio

Both sides used machines to encrypt messages. The Germans used the Enigma machine. The British used the Typex. Intercepted signals were usually in code and had to be deciphered. The resulting intelligence, code named ULTRA, had to be carefully used to ensure that the Germans did not realise their codes had been broken. The breaking of the Enigma code played a major part in the Allied victory.

The Reception Set CR100

This is a high performance super heterodyne receiver that was used in fixed locations. It could intercept voice and morse code transmissions in the range 30 to 60 MHz. It was made by Marconi. It is typical of the equipment that was used in the war of interception.
Other exhibits include the Mark III suitcase set. Weighing 9lbs it was built in 1944 and was the smallest transceiver conceived during the Second World War. Different types of cipher machines are also on display including the Enigma machine which can now be seen in the interactive Enigma exhibition.




Go To It

During the Second World War, troops were dropped by parachute or glider for the first time. British Airborne Forces were first used on the Bruneval raid in February 1942. The equipment of the Airborne Signals had to be portable so it could be carried by man in a hand-cart or in a jeep and trailer.

On 6th June 1944 airborne forces landed in France. A line laying party tried to lay a telephone line across the Caen Canal Bridge. All were wounded but Corporal Waters carried one of the wounded to safety then laid the line across the bridge under enemy fire and maintained the line single-handed throughout the day. For this he was awarded the Military Medal.

His bravery is remembered in a Corps painting depicting the events of that day and a model of Corporal Waters laying the line across the bridge is on display in the Museum.


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