An electrical telegraph was a point-to-point text messaging system, used from the 1840s until better systems became widespread. It used coded pulses of electric current through dedicated wires to transmit information over long distances. It was the first electrical telecommunications system, the most widely used of a number of early messaging systems called telegraphs, devised to send text messages more rapidly than written messages could be sent.
An electrical telegraph consisted of two or more geographically separated stations (often called telegraph offices) connected by wires, usually supported overhead on utility poles. There were many different electrical telegraph systems invented, but the ones that became widespread fit into two broad categories. The first was needle telegraphs in which a needle pointer is made to move electromagnetically with a pulse of electric current from a battery or dynamo down the telegraph line. Early systems used multiple needles requiring multiple wires. The first commercial system, and the most widely used needle telegraph, was the Cooke and Wheatstone telegraph, invented in 1837. Early equipment sets used five needles to point to the letter being transmitted, but the cost of installing wires was more economically significant than the cost of training operators so a single-needle system with a code that had to be learned became the norm.
The second category was armature systems in which the pulse activates a telegraph sounder which makes a click. The archetype of this category was the Morse system, invented by Samuel Morse in 1838, using a single wire. At the sending station, an operator would tap on a switch called a telegraph key, spelling out text messages in Morse code. Originally, the armature was intended to make marks on paper tape, but operators learned to interpret the clicks and it was more efficient to write down the message directly. In 1865, the Morse system became the standard for international communication with a modified code developed for German railways. However, some countries continued to use established national systems internally for some time afterwards.
In the 1840s the electrical telegraph superseded optical telegraph systems (except in France), becoming the standard way to send urgent messages. By the latter half of the century, most developed nations had created commercial telegraph networks with local telegraph offices in most cities and towns, allowing the public to send messages called telegrams addressed to any person in the country, for a fee. Beginning in 1854 submarine telegraph cables allowed the first rapid communication between continents. Electrical telegraph networks permitted people and commerce to transmit messages across both continents and oceans almost instantly, with widespread social and economic impacts. In the early 20th century the telegraph was slowly replaced by teletype networks.
From early studies of electricity, electrical phenomena were known to travel with great speed, and many experimenters worked on the application of electricity to communications at a distance. All the known effects of electricity—such as sparks, electrostatic attraction, chemical changes, electric shocks, and later electromagnetism—were applied to the problems of detecting controlled transmissions of electricity at various distances.
In 1753, an anonymous writer in the Scots Magazine suggested an electrostatic telegraph. Using one wire for each letter of the alphabet, a message could be transmitted by connecting the wire terminals in turn to an electrostatic machine, and observing the deflection of pith balls at the far end. The writer has never been positively identified, but the letter was signed C.M. and posted from Renfrew leading to a Charles Marshall of Renfrew being suggested. Telegraphs employing electrostatic attraction were the basis of early experiments in electrical telegraphy in Europe, but were abandoned as being impractical and were never developed into a useful communication system.
In 1800, Alessandro Volta invented the voltaic pile, allowing for a continuous current of electricity for experimentation. This became a source of a low-voltage current that could be used to produce more distinct effects, and which was far less limited than the momentary discharge of an electrostatic machine, which with Leyden jars were the only previously known man-made sources of electricity.
Another very early experiment in electrical telegraphy was an 'electrochemical telegraph' created by the German physician, anatomist and inventor Samuel Thomas von Sömmering in 1809, based on an earlier, less robust design of 1804 by Spanish polymath and scientist Francisco Salva Campillo. Both their designs employed multiple wires (up to 35) to represent almost all Latin letters and numerals. Thus, messages could be conveyed electrically up to a few kilometers (in von Sömmering's design), with each of the telegraph receiver's wires immersed in a separate glass tube of acid. An electric current was sequentially applied by the sender through the various wires representing each letter of a message; at the recipient's end the currents electrolysed the acid in the tubes in sequence, releasing streams of hydrogen bubbles next to each associated letter or numeral. The telegraph receiver's operator would watch the bubbles and could then record the transmitted message. This is in contrast to later telegraphs that used a single wire (with ground return).
Hans Christian Ørsted discovered in 1820 that an electric current produces a magnetic field that will deflect a compass needle. In the same year Johann Schweigger invented the galvanometer, with a coil of wire around a compass, which could be used as a sensitive indicator for an electric current. In 1821, André-Marie Ampère suggested that telegraphy could be done by a system of galvanometers, with one wire per galvanometer to indicate each letter, and said he had experimented successfully with such a system. In 1824, Peter Barlow said that such a system only worked to a distance of about 200 feet (61 m), and so was impractical. In 1830 Ritchie created a galvanometer telegraph that overcame the problem highlighted by Barlow by modifying the battery. Though the telegraph was impractical due to the number of wires required, it did demonstrate the feasibility of the electromagnetic telegraph.
In 1825, William Sturgeon invented the electromagnet, with a single winding of uninsulated wire on a piece of varnished iron, which increased the magnetic force produced by electric current. Joseph Henry improved it in 1828 by placing several windings of insulated wire around the bar, creating a much more powerful electromagnet which could operate a telegraph through the high resistance of long telegraph wires. During his tenure at The Albany Academy from 1826 to 1832, Henry first demonstrated the theory of the 'magnetic telegraph' by ringing a bell through a mile (1.6 km) of wire strung around the room in 1831.
In 1835, Joseph Henry and Edward Davy invented the critical electrical relay. Davy's relay used a magnetic needle which dipped into a mercury contact when an electric current passed through the surrounding coil. Davy demonstrated his telegraph system in Regent's Park in 1837 and was granted a patent on 4 July 1838. Davy also invented a printing telegraph which used the electric current from the telegraph signal to mark a ribbon of calico impregnated with potassium iodide and calcium hypochlorite.
First working systems
The first working telegraph was built by the English inventor Francis Ronalds in 1816 and used static electricity. At the family home on Hammersmith Mall, he set up a complete subterranean system in a 175 yard long trench as well as an eight mile long overhead telegraph. The lines were connected at both ends to revolving dials marked with the letters of the alphabet and electrical impulses sent along the wire were used to transmit messages. Offering his invention to the Admiralty in July 1816, it was rejected as "wholly unnecessary". His account of the scheme and the possibilities of rapid global communication in Descriptions of an Electrical Telegraph and of some other Electrical Apparatus was the first published work on electric telegraphy and even described the risk of signal retardation due to induction. Elements of Ronalds’ design were utilised in the subsequent commercialisation of the telegraph over 20 years later.
The telegraph invented by Baron Schilling von Canstatt in 1832 had a transmitting device which consisted of a keyboard with 16 black-and-white keys. These served for switching the electric current. The receiving instrument consisted of six galvanometers with magnetic needles, suspended from silk threads. Both stations of Schilling's telegraph were connected by eight wires; six were connected with the galvanometers, one served for the return current and one for a signal bell. When at the starting station the operator pressed a key, the corresponding pointer was deflected at the receiving station. Different positions of black and white flags on different disks gave combinations which corresponded to the letters or numbers. Pavel Schilling subsequently improved its apparatus. He reduced the number of connecting wires from eight to two.
On 21 October 1832, Schilling managed a short-distance transmission of signals between two telegraphs in different rooms of his apartment. In 1836, the British government attempted to buy the design but Schilling instead accepted overtures from Nicholas I of Russia. Schilling's telegraph was tested on a 5-kilometre-long (3.1 mi) experimental underground and underwater cable, laid around the building of the main Admiralty in Saint Petersburg and was approved for a telegraph between the imperial palace at Peterhof and the naval base at Kronstadt. However, the project was cancelled following Schilling's death in 1837. Schilling was also one of the first to put into practice the idea of the binary system of signal transmission.
In 1833, Carl Friedrich Gauss, together with the physics professor Wilhelm Weber in Göttingen installed a 1,200-metre-long (3,900 ft) wire above the town's roofs. Gauss combined the Poggendorff-Schweigger multiplicator with his magnetometer to build a more sensitive device, the galvanometer. To change the direction of the electric current, he constructed a commutator of his own. As a result, he was able to make the distant needle move in the direction set by the commutator on the other end of the line.
At first, Gauss and Weber used the telegraph to coordinate time, but soon they developed other signals; finally, their own alphabet. The alphabet was encoded in a binary code which was transmitted by positive or negative voltage pulses which were generated by means of moving an induction coil up and down over a permanent magnet and connecting the coil with the transmission wires by means of the commutator. The page of Gauss' laboratory notebook containing both his code and the first message transmitted, as well as a replica of the telegraph made in the 1850s under the instructions of Weber are kept in the faculty of physics at the University of Göttingen, in Germany.
Gauss was convinced that this communication would be a help to his kingdom's towns. Later in the same year, instead of a Voltaic pile, Gauss used an induction pulse, enabling him to transmit seven letters a minute instead of two. The inventors and university were too poor to develop the telegraph on their own, but they received funding from Alexander von Humboldt. Carl August Steinheil in Munich was able to build a telegraph network within the city in 1835–1836. He installed a telegraph line along the first German railroad in 1835.
By 1837, William Fothergill Cooke and Charles Wheatstone had co-developed a telegraph system which used a number of needles on a board that could be moved to point to letters of the alphabet. Any number of needles could be used, depending on the number of characters it was required to code. In May 1837 they patented their system. The patent recommended five needles, which coded twenty of the alphabet's 26 letters.
Samuel Morse independently developed and patented a recording electric telegraph in 1837. Morse's assistant Alfred Vail developed an instrument that was called the register for recording the received messages. It embossed dots and dashes on a moving paper tape by a stylus which was operated by an electromagnet. Morse and Vail developed the Morse code signalling alphabet. The first telegram in the United States was sent by Morse on 11 January 1838, across two miles (3 km) of wire at Speedwell Ironworks near Morristown, New Jersey, although it was only later, in 1844, that he sent the message "WHAT HATH GOD WROUGHT" over the 44 miles (71 km) from the Capitol in Washington to the old Mt. Clare Depot in Baltimore.
Cooke and Wheatstone system
The first commercial electrical telegraph was the Cooke and Wheatstone system. A demonstration four-needle system was installed on the Euston to Camden Town section of Robert Stephenson's London and Birmingham Railway in 1837 for signalling rope-hauling of locomotives. It was rejected in favour of pneumatic whistles. Cooke and Wheatstone had their first commercial success with a system installed on the Great Western Railway over the 13 miles (21 km) from Paddington station to West Drayton in 1838. This was a five-needle, six-wire system. This system suffered from failing insulation on the underground cables. When the line was extended to Slough in 1843, the telegraph was converted to a one-needle, two-wire system with uninsulated wires on poles. The one-needle telegraph proved highly successful on British railways, and 15,000 sets were still in use at the end of the nineteenth century. Some remained in service in the 1930s. The Electric Telegraph Company, the world's first public telegraphy company was formed in 1845 by financier John Lewis Ricardo and Cooke.
Wheatstone ABC telegraph
Wheatstone developed a practical alphabetical system in 1840 called the A.B.C. System, used mostly on private wires. This consisted of a "communicator" at the sending end and an "indicator" at the receiving end. The communicator consisted of a circular dial with a pointer and the 26 letters of the alphabet (and four punctuation marks) around its circumference. Against each letter was a key that could be pressed. A transmission would begin with the pointers on the dials at both ends set to the start position. The transmitting operator would then press down the key corresponding to the letter to be transmitted. In the base of the communicator was a magneto actuated by a handle on the front. This would be turned to apply an alternating voltage to the line. Each half cycle of the current would move the pointers at both ends on by one position. When the pointer reached the position of the depressed key, it would stop and the magneto would be disconnected from the line. The communicator's pointer was geared to the magneto mechanism. The indicator's pointer was moved by a polarised electromagnet whose armature was coupled to it through an escapement. Thus the alternating line voltage moved the indicator's pointer on to the position of the depressed key on the communicator. Pressing another key would then release the pointer and the previous key, and re-connect the magneto to the line. These machines were very robust and simple to operate, and they stayed in use in Britain until well into the 20th century.
In 1851, a conference in Vienna of countries in the German-Austrian Telegraph Union (which included many central European countries) adopted the Morse telegraph as the system for international communications. The code adopted was considerably modified from the original Morse code, and was based on a code used on Hamburg railways (Gerke, 1848). A common code was a necessary step to allow direct telegraph connection between countries. With different codes, additional operators were required to translate and retransmit the message. In 1865, a conference in Paris adopted Gerke's code as the International Morse code and was henceforth the international standard. The US, however, continued to use American Morse code internally for some time, hence international messages required retransmission in both directions.
In the United States, the Morse/Vail telegraph was quickly deployed in the two decades following the first demonstration in 1844. The overland telegraph connected the west coast of the continent to the east coast by 24 October 1861, bringing an end to the Pony Express.
France was slow to adopt the electrical telegraph. They had an extensive optical telegraph system built during the Napoleonic era. There was also serious concern that an electrical telegraph could be quickly put out of action by enemy saboteurs, something that was much more difficult to do with optical telegraphs which had no exposed hardware between stations. The Foy-Breguet telegraph was eventually adopted. This was a two-needle system using two signal wires, but displayed in a uniquely different way to other needle telegraphs. The needles made symbols similar to the Chappe optical system symbols, making it more familiar to the telegraph operators. The optical system was decommissioned starting in 1846, but not completed until 1855. In that year the Foy-Breguet system was replaced with the Morse system.
As well as the rapid expansion of the use of the telegraphs along the railways, they soon spread into the field of mass communication with the instruments being installed in post offices. The era of mass personal communication had begun. Telegraph networks were expensive to build, but financing was readily available, especially from London bankers. By 1852, National systems were in operation in major countries:
|Country||Company or system||Miles of wire||ref|
|United States||20 companies||23,000|
|United Kingdom||Electric Telegraph Company, Magnetic Telegraph Company, and others||2,200|
|France||optical systems dominant||700|
Although many countries had telegraph networks, there was no worldwide interconnection. Message by post was still the primary means of communication to countries outside Europe.
A continuing goal in telegraphy was to reduce the cost per message by reducing hand-work, or increasing the sending rate. There were many experiments with moving pointers, and various electrical encodings. However, most systems were too complicated and unreliable. A successful expedient to reduce the cost per message was the development of telegraphese.
The first system that didn't require skilled technicians to operate, was Charles Wheatstone's ABC system in 1840 where the letters of the alphabet were arranged around a clock-face, and the signal caused a needle to indicate the letter. This early system required the receiver to be present in real time to record the message and it reached speeds of up to 15 words a minute.
In 1846, Alexander Bain patented a chemical telegraph in Edinburgh. The signal current moved an iron pen across a moving paper tape soaked in a mixture of ammonium nitrate and potassium ferrocyanide, decomposing the chemical and producing readable blue marks in Morse code. The speed of the printing telegraph was 1000 words per hour, but messages still required translation into English by live copyists. Chemical telegraphy came to an end in the US in 1851, when the Morse group defeated the Bain patent in the US District Court.
For a brief period, starting with the New York–Boston line in 1848, some telegraph networks began to employ sound operators, who were trained to understand Morse code aurally. Gradually, the use of sound operators eliminated the need for telegraph receivers to include register and tape. Instead, the receiving instrument was developed into a "sounder", an electromagnet that was energized by a current and attracted a small iron lever. When the sounding key was opened or closed, the sounder lever struck an anvil. The Morse operator distinguished a dot and a dash by the short or long interval between the two clicks. The message was then written out in long-hand.
Royal Earl House developed and patented a letter-printing telegraph system in 1846 which employed an alphabetic keyboard for the transmitter and automatically printed the letters on paper at the receiver, and followed this up with a steam-powered version in 1852. Advocates of printing telegraphy said it would eliminate Morse operators' errors. The House machine was used on four main American telegraph lines by 1852. The speed of the House machine was announced as 2600 words an hour.
David Edward Hughes invented the printing telegraph in 1855; it used a keyboard of 26 keys for the alphabet and a spinning type wheel that determined the letter being transmitted by the length of time that had elapsed since the previous transmission. The system allowed for automatic recording on the receiving end. The system was very stable and accurate and became accepted around the world.
The next improvement was the Baudot code of 1874. French engineer Émile Baudot patented a printing telegraph in which the signals were translated automatically into typographic characters. Each character was assigned a five-bit code, mechanically interpreted from the state of five on/off switches. Operators had to maintain a steady rhythm, and the usual speed of operation was 30 words per minute.
By this point reception had been automated, but the speed and accuracy of the transmission was still limited to the skill of the human operator. The first practical automated system was patented by Charles Wheatstone, the original inventor of the telegraph. The message (in Morse code) was typed onto a piece of perforated tape using a keyboard-like device called the 'Stick Punch'. The transmitter automatically ran the tape through and transmitted the message at the then exceptionally high speed of 70 words per minute.
An early successful teleprinter was invented by Frederick G. Creed. In Glasgow he created his first keyboard perforator, which used compressed air to punch the holes. He also created a reperforator (receiving perforator) and a printer. The reperforator punched incoming Morse signals on to paper tape and the printer decoded this tape to produce alphanumeric characters on plain paper. This was the origin of the Creed High Speed Automatic Printing System, which could run at an unprecedented 200 words per minute. His system was adopted by the Daily Mail for daily transmission of the newspaper contents.
With the invention of the teletypewriter, telegraphic encoding became fully automated. Early teletypewriters used the ITA-1 Baudot code, a five-bit code. This yielded only thirty-two codes, so it was over-defined into two "shifts", "letters" and "figures". An explicit, unshared shift code prefaced each set of letters and figures. In 1901, Baudot's code was modified by Donald Murray.
By 1935, message routing was the last great barrier to full automation. Large telegraphy providers began to develop systems that used telephone-like rotary dialling to connect teletypewriters. These resulting system was called "Telex" (TELegraph EXchange). Telex machines first performed rotary-telephone-style pulse dialling for circuit switching, and then sent data by ITA2. This "type A" Telex routing functionally automated message routing.
The first wide-coverage Telex network was implemented in Germany during the 1930s as a network used to communicate within the government.
At the rate of 45.45 (±0.5%) baud — considered speedy at the time — up to 25 telex channels could share a single long-distance telephone channel by using voice frequency telegraphy multiplexing, making telex the least expensive method of reliable long-distance communication.
The harmonic telegraph
The most expensive aspect of a telegraph system was the installation – the laying of the wire, which was often very long. The costs would be better covered by finding a way to send more than one message at a time through the single wire, thus increasing revenue per wire. Early devices included the duplex and the quadruplex which allowed, respectively, one or two telegraph transmissions in each direction. However, an even greater number of channels was desired on the busiest lines. In the latter half of the 1800s, several inventors worked towards creating a method for doing just that, including Charles Bourseul, Thomas Edison, Elisha Gray, and Alexander Graham Bell.
One approach was to have resonators of several different frequencies act as carriers of a modulated on-off signal. This was the harmonic telegraph, a form of frequency-division multiplexing. These various frequencies, referred to as harmonics, could then be combined into one complex signal and sent down the single wire. On the receiving end, the frequencies would be separated with a matching set of resonators.
With a set of frequencies being carried down a single wire, it was realized that the human voice itself could be transmitted electrically through the wire. This effort led to the invention of the telephone. (While the work toward packing multiple telegraph signals onto one wire led to telephony, later advances would pack multiple voice signals onto one wire by increasing the bandwidth by modulating frequencies much higher than human hearing. Eventually the bandwidth was widened much further by using laser light signals sent through fiber optic cables. Fiber optic transmission can carry 25,000 telephone signals simultaneously down a single fiber.)
Oceanic telegraph cables
Soon after the first successful telegraph systems were operational, the possibility of transmitting messages across the sea by way of submarine communications cables was first proposed. One of the primary technical challenges was to sufficiently insulate the submarine cable to prevent the current from leaking out into the water. In 1842, a Scottish surgeon William Montgomerie introduced gutta-percha, the adhesive juice of the Palaquium gutta tree, to Europe. Michael Faraday and Wheatstone soon discovered the merits of gutta-percha as an insulator, and in 1845, the latter suggested that it should be employed to cover the wire which was proposed to be laid from Dover to Calais. It was tried on a wire laid across the Rhine between Deutz and Cologne. In 1849, C.V. Walker, electrician to the South Eastern Railway, submerged a two-mile wire coated with gutta-percha off the coast from Folkestone, which was tested successfully.
John Watkins Brett, an engineer from Bristol, sought and obtained permission from Louis-Philippe in 1847 to establish telegraphic communication between France and England. The first undersea cable was laid in 1850, connecting the two countries and was followed by connections to Ireland and the Low Countries.
The Atlantic Telegraph Company was formed in London in 1856 to undertake to construct a commercial telegraph cable across the Atlantic Ocean. It was successfully completed on 18 July 1866 by the ship SS Great Eastern, captained by Sir James Anderson after many mishaps along the away. Earlier transatlantic submarine cables installations were attempted in 1857, 1858 and 1865. The 1857 cable only operated intermittently for a few days or weeks before it failed. The study of underwater telegraph cables accelerated interest in mathematical analysis of very long transmission lines. The telegraph lines from Britain to India were connected in 1870 (those several companies combined to form the Eastern Telegraph Company in 1872).
Australia was first linked to the rest of the world in October 1872 by a submarine telegraph cable at Darwin. This brought news reportage from the rest of the world. The telegraph across the Pacific was completed in 1902, finally encircling the world.
From the 1850s until well into the 20th century, British submarine cable systems dominated the world system. This was set out as a formal strategic goal, which became known as the All Red Line. In 1896, there were thirty cable laying ships in the world and twenty-four of them were owned by British companies. In 1892, British companies owned and operated two-thirds of the world's cables and by 1923, their share was still 42.7 percent.
Cable and Wireless Company
Cable & Wireless was a British telecommunications company that traced its origins back to the 1860s, with Sir John Pender as the founder, although the name was only adopted in 1934. It was formed from successive mergers including:
Telegraphy in war
The ability to send telegrams brought obvious advantages to those conducting war. Secret messages were encoded, so interception alone would not be sufficient for the opposing side to gain an advantage. There were geographical constraints on intercepting the telegraph cables, but once radio was used, interception could be much more widespread.
The Crimean War was one of the first conflicts to use telegraphs and was one of the first to be documented extensively. In 1854, the government in London created a military Telegraph Detachment for the Army commanded by an officer of the Royal Engineers. It was to comprise twenty-five men from the Royal Corps of Sappers & Miners trained by the Electric Telegraph Company to construct and work the first field electric telegraph.
Journalistic recording of the war was provided by William Howard Russell (writing for The Times newspaper) with photographs by Roger Fenton. News from war correspondents kept the public of the nations involved in the war informed of the day-to-day events in a way that had not been possible in any previous war. After the French extended the telegraph to the coast of the Black Sea in late 1854, the news reached London in two days. When the British laid an underwater cable to the Crimean peninsula in April 1855, news reached London in a few hours. The daily news reports energised public opinion, which brought down the government and led to Lord Palmerston becoming prime minister.
American Civil War
During the American Civil War the telegraph proved its value as a tactical, operational, and strategic communication medium and an important contributor to Union victory. By contrast the Confederacy failed to make effective use of the South's much smaller telegraph network. Prior to the War the telegraph systems were primarily used in the commercial sector. Government buildings were not inter-connected with telegraph lines, but relied on runners to carry messages back and forth. Before the war the Government saw no need to connect lines within city limits, however, they did see the use in connections between cities. Washington D.C. being the hub of Government, it had the most connections, but there were only a few lines running north and south out of the city. It wasn't until the Civil War that the Government saw the true potential of the telegraph system. Soon after the shelling of Fort Sumter, the South cut telegraph lines running into D.C. which put the city in a state of panic for they feared an immediate Southern invasion.
Within 6 months of the start of the war, the U.S. Military Telegraph Corps (USMT) had laid approximately 300 miles of line. By war's end they had laid approximately 15,000 miles of cable, 8,000 for military and 5,000 for commercial use, and had handled approximately 6.5 million messages. The telegraph was not only important for communication within the armed forces, but also in the civilian sector, helping political leaders to maintain control over their districts.
Even before the war, the American Telegraph Company censored suspect messages informally to block aid to the secession movement. During the war, Secretary of War Simon Cameron, and later Edwin Stanton, wanted control over the telegraph lines to maintain the flow of information. Early in the war, one of Stanton's first acts as Secretary of War was to move telegraph lines from ending at McClellan's headquarters to terminating at the War Department. Even Stanton himself said "[telegraphy] is my right arm". Telegraphy assisted Northern victories, including the Battle of Antietam (1862), the Battle of Chickamauga (1863), and Sherman's March to the Sea (1865).
The telegraph system still had its flaws. The USMT, while the main source of telegraphers and cable, was still a civilian agency. Most operators were first hired by the telegraph companies and then contracted out to the War Department. This created tension between Generals and their operators. One source of irritation was that USMT operators didn't have to follow military authority. Usually they performed without hesitation, but they didn't have to, so Albert Myer created a U.S. Army Signal Corps in February 1863. As the new head of the Signal Corps, Myer tried to get all telegraph and flag signaling under his command, and therefore subject to military discipline. After creating the Signal Corps, Myer pushed to further develop new telegraph systems. While the USMT relied primarily on civilian lines and operators, the Signal Corp's new field telegraph could be deployed and dismantled faster than USMT's system.
First World War
During World War I, Britain's telegraph communications were almost completely uninterrupted, while it was able to quickly cut Germany's cables worldwide. British access to transatlantic cables and its codebreaking expertise led to the Zimmermann Telegram incident that contributed to the US joining the war.
Second World War
World War II revived the 'cable war' of 1914-1918. In 1939, German-owned cables across the Atlantic were cut once again, and, in 1940, Italian cables to South America and Spain were cut in retaliation for Italian action against two of the five British cables linking Gibraltar and Malta. Electra House, Cable & Wireless's head office and central cable station, was damaged by German bombing in 1941.
Resistance movements in occupied Europe sabotaged communications facilities such as telegraph lines, forcing the Germans to use wireless telegraphy, which could then be intercepted by Britain. The Germans developed a highly complex teleprinter attachment (German: Schlüssel-Zusatz) that was used for enciphering telegrams between German High Command (OKW) and the army groups in the field. These contained situation reports, battle plans, and discussions of strategy and tactics. Britain intercepted these signals, diagnosed how the encrypting machine worked, and decrypted a large amount of teleprinter traffic.
End of the telegraph era
In America, the end of the telegraph era can be associated with the fall of the Western Union Telegraph Company. Western Union was the leading telegraph provider for America and was seen as the best competition for the National Bell Telephone Company. Western Union and Bell were both invested in telegraphy and telephone technology. Western Union's decision to allow Bell to gain the advantage in telephone technology was the result of Western Union's upper management's failure to foresee the surpassing of the telephone over the, at the time, dominant telegraph system. Western Union soon lost the legal battle for the rights to their telephone copyrights. This led to Western Union agreeing to a lesser position in the telephone competition, which in turn led to the lessening of the telegraph.
While the telegraph was not the focus of the legal battles that occurred around 1878, the companies that were affected by the effects of the battle were the main powers of telegraphy at the time. Western Union thought that the agreement of 1878 would solidify telegraphy as the long-range communication of choice. However, due to the underestimates of telegraph's future and poor contracts, Western Union found itself declining. AT&T acquired working control of Western Union in 1909 but relinquished it in 1914 under threat of antitrust action. AT&T bought Western Union's electronic mail and Telex businesses in 1990.
- 92 Code
- Aurora (astronomy)
- Geomagnetically induced current
- Great Northern Telegraph Company
- Harrison Gray Dyar, who supposedly erected the first telegraph line and dispatched the first telegram
- Neutral direct-current telegraph system
- Western Electric Company
- Wireless telegraphy
- American Telephone and Telegraph Company (AT&T)
- Bell Canada
- Speedwell Ironworks
- Moss, Stephen (10 July 2013), "Final telegram to be sent. STOP", The Guardian: International Edition
- Tancia (2014), A History of Telegraphy (PDF)
- Fahie, J. J. (1884), A History of Electric Telegraphy to the year 1837 (PDF), London: E. & F. N. Spon
- E. A. Marland, Early Electrical Communication, Abelard-Schuman Ltd, London 1964, no ISBN, Library of Congress 64-20875, pages 17-19;
- Holzmann & Pehrson, p. 203
- Electromagnetic Telegraph - Invented by Baron Pavel Schilling
- Prevost, 1805, pp. 176-178
- Jones 1999.
- M. (10 December 2014). Schweigger Multiplier – 1820. Retrieved 7 February 2018, from https://nationalmaglab.org/education/magnet-academy/history-of-electricity-magnetism/museum/schweigger-multiplier
- R. V. G. Menon (2011). Technology and Society. India: Dorling Kindersley.
- Henry Pitt Phelps (1884). The Albany Hand-book: A Strangers' Guide and Residents' Manual. Albany: Brandow & Barton. p. 6.
- Gibberd 1966.
- "Joseph Henry: Inventor of the Telegraph? Smithsonian Institution". Archived from the original on 26 June 2006. Retrieved 29 June 2006.
- Thomas Coulson (1950). Joseph Henry: His Life and Work. Princeton: Princeton University Press.
- "Edward Davy". Australian Science Archives Project. Retrieved 7 June 2012.
- Kieve, pp. 23-24
- Appleyard, R. (1930). Pioneers of Electrical Communication. Macmillan.
- Norman, Jeremy. "Francis Ronalds Builds the First Working Electric Telegraph (1816)". HistoryofInformation.com. Retrieved 1 May 2016.
- Ronalds, B.F. (2016). "Sir Francis Ronalds and the Electric Telegraph". Int. J. for the History of Engineering & Technology. doi:10.1080/17581206.2015.1119481.
- Ronalds, Francis (1823). Descriptions of an Electrical Telegraph and of some other Electrical Apparatus. London: Hunter.
- Ronalds, B.F. (February 2016). "The Bicentennial of Francis Ronalds's Electric Telegraph". Physics Today. doi:10.1063/PT.3.3079.
- Ronalds, B.F. (2016). Sir Francis Ronalds: Father of the Electric Telegraph. London: Imperial College Press. ISBN 978-1-78326-917-4.
- Fahie, John Jacob (1884). A History of Electric Telegraphy, to the Year 1837 (PDF). E. & F.N. Spon. pp. 307–319. Retrieved 21 November 2017.
- Huurdeman 2003, p. 54.
- Calvert 2008.
- Howe, p. 7
- History.com Staff (2009), Morse Code & the Telegraph, A+E Networks
- The telegraphic age dawns BT Group Connected Earth Online Museum. Accessed December 2010, archived 10 Feb 2013
- Bowers, page 129
- Huurdeman 2003, p. 67.
- Huurdeman 2003, pp. 67–68.
- Beauchamp 2001, p. 35.
- Huurdeman 2003, p. 69.
- Huurdeman 2003, pp. 67-69.
- Nichols, John (1967). The Gentleman's magazine, Volumes 282–283. p. 545. University of California
- Paul Atterbury. "Victorian Technology". BBC.
- Freebody, J. W. (1958), "Historical Survey of Telegraphy", Telegraphy, London: Sir Isaac Pitman & Sons, Ltd., pp. 30, 31
- Laurence Turnbull, Electro-magnetic telegraph, p. 77, Philadelphia: A. Hart, 1853 OCLC 60717772
- Lewis Coe, The Telegraph: A History of Morse's Invention and Its Predecessors in the United States, p. 69, McFarland, 2003 ISBN 0786418087.
- Andrew L. Russell, Open Standards and the Digital Age, p. 36, Cambridge University Press, 2014 ISBN 1107039193.
- Today in History - 24 October, The Transcontinental Telegraph and the End of the Pony Express, Library of Congress, retrieved 3 February 2017.
- Holzmann & Pehrson, pp. 93–94
- Christine Rider, ed., Encyclopedia of the Age of the Industrial Revolution, 1700–1920 (2007) 2:440.
- Taliaferro Preston Shaffner, The Telegraph Manual: A Complete History and Description of the Semaphoric, Electric and Magnetic Telegraphs of Europe, Asia, Africa, and America, Ancient and Modern: with Six Hundred and Twenty-five Illustrations (1867).
- Richard B. Du Boff, "Business Demand and the Development of the Telegraph in the United States, 1844–1860." Business History Review 54#4 (1980): 459–479.
- John Liffen, "The Introduction of the Electric Telegraph in Britain, a Reappraisal of the Work of Cooke and Wheatstone." International Journal for the History of Engineering & Technology (2013).
- Roberts, Steven (2012), A History of the Telegraph Companies in Britain between 1838–1868, retrieved 8 May 2017
- Oslin, George P. The Story of Telecommunications, Mercer University Press, 1992. 69.
- Oslin, George P. The Story of Telecommunications. Mercer University Press, 1992. 67
- "Royal Earl House Printing-Telegraph Patent #4464, 1846". Retrieved 25 April 2014.
- "Royal Earl House Steam-Powered Printing-Telegraph Patent #9505, 1852". Retrieved 25 April 2014.
- Oslin, George, P. The Story of Telecommunications, 1992. 71
- "David Edward Hughes". Clarkson University. 14 April 2007. Archived from the original on 22 April 2008. Retrieved 29 September 2010.
- Beauchamp 2001, pp. 394–395.
- Phillip R. Easterlin, "Telex in New York", Western Union Technical Review, April 1959: 45
- Haigh, K R (1968). Cable Ships and Submarine Cables. London: Adlard Coles Ltd. pp. 26–27.
- Wilson, Arthur (1994). The Living Rock: The Story of Metals Since Earliest Times and Their Impact on Civilization. p. 203. Woodhead Publishing. ISBN 978-1-85573-301-5.
- Briggs, Asa and Burke, Peter: "A Social History of the Media: From Gutenberg to the Internet", p110. Polity, Cambridge, 2005.
- Conley, David and Lamble, Stephen (2006) The Daily Miracle: An introduction to Journalism,(Third Edition) Oxford University Press, Australia pp. 305-307
- Kennedy, P. M. (October 1971). "Imperial Cable Communications and Strategy, 1870-1914". The English Historical Review. 86 (341): 728–752. doi:10.1093/ehr/lxxxvi.cccxli.728. JSTOR 563928.
- Headrick, D.R., & Griset, P. (2001). Submarine telegraph cables: business and politics, 1838-1939. The Business History Review, 75(3), 543-578.
- Sir John Pender
- Evolution of Eastern Telegraph Company
- Origins of the Eastern & Associated Telegraph Companies
- Roberts, Steven (2012), Distant Writing A History of Telegraph Companies in Britain between 1838 and 1868: 16. Telegraph at War 1854 - 1868
- Figes 2010, pp. 306–09.
- Figes 2010, pp. 304–11.
- Hochfelder, David (2019), Essential Civil WAR Curriculum: The Telegraph, Virginia Center for Civil War Studies at Virginia Tech
- Schwoch 2018.
- Hochfelder 2012.
- Kennedy 1971.
- "The telegram that brought America into the First World War". BBC History Magazin e. 17 January 2017.
- Company-Histories.com Cable and Wireless plc Source: International Directory of Company Histories, Vol. 25. St. James Press, 1999.
- World War II: German-occupied Europe, Encyclopaedia Britannica
- Copeland 2006, pp. 1-6.
- Beauchamp, Ken (2001), History Of Telegraphy, London: The Institution Of Electrical Engineers, ISBN 978-0-85296-792-8
- Bowers, Brian, Sir Charles Wheatstone: 1802–1875, IET, 2001 ISBN 0852961030.
- Calvert, J. B. (2008), The Electromagnetic Telegraph
- Copeland, B. Jack, ed. (2006), Colossus: The Secrets of Bletchley Park's Codebreaking Computers, Oxford: Oxford University Press, ISBN 978-0-19-284055-4
- Figes, Orlando (2010). Crimea: The Last Crusade. London: Allen Lane. ISBN 978-0-7139-9704-0.
- Gibberd, William (1966), Australian Dictionary of Biography: Edward Davy
- Hochfelder, David (2012). The Telegraph in America, 1832-1920. Johns Hopkins University Press. pp. 6–17, 138–141. ISBN 9781421407470.
- Holzmann, Gerard J.; Pehrson, Björn, The Early History of Data Networks, Wiley, 1995 ISBN 0818667826.
- Huurdeman, Anton A. (2003), The Worldwide History of Telecommunications, Wiley-Blackwell, ISBN 978-0471205050
- Jones, R. Victor (1999), Samuel Thomas von Sömmering's "Space Multiplexed" Electrochemical Telegraph (1808-10), retrieved 1 May 2009 Attributed to Michaelis, Anthony R. (1965), From semaphore to satellite, Geneva: International Telecommunication Union
- Kennedy, P. M. (October 1971). "Imperial Cable Communications and Strategy, 1870-1914". The English Historical Review. 86 (341): 728–752. doi:10.1093/ehr/lxxxvi.cccxli.728. JSTOR 563928.
- Kieve, Jeffrey L., The Electric Telegraph: A Social and Economic History, David and Charles, 1973 OCLC 655205099.
- Mercer, David, The Telephone: The Life Story of a Technology, Greenwood Publishing Group, 2006 ISBN 031333207X.
- Schwoch, James (2018). Wired into Nature: The Telegraph and the North American Frontier. University of Illinois Press. ISBN 9780252041778.
- Cooke, W.F., The Electric Telegraph, Was it invented by Prof. Wheatstone?, London 1856.
- Gray, Thomas (1892). "The Inventors Of The Telegraph And Telephone". Annual Report of the Board of Regents of the Smithsonian Institution. 71: 639–659. Retrieved 7 August 2009.
- Gauß, C. F., Works, Göttingen 1863-1933.
- Howe, Daniel Walker, What Hath God Wrought: The Transformation of America, 1815-1848, Oxford University Press, 2007 ISBN 0199743797.
- Peterson, M.J. Roots of Interconnection: Communications, Transportation and Phases of the Industrial Revolution, International Dimensions of Ethics Education in Science and Engineering Background Reading, Version 1; February 2008.
- Steinheil, C.A., Ueber Telegraphie, München 1838.
- Wiley, Samuel T. (ed.), Biographical and Historical Cyclopedia of Indiana and Armstrong Counties, John M. Gresham and Co., Philadelphia PA, 1891, pages 475-476.
- Yates, JoAnne. The Telegraph's Effect on Nineteenth Century Markets and Firms, Massachusetts Institute of Technology, pp. 149–163.
|Wikisource has original text related to this article:|
- Morse Telegraph Club, Inc. (The Morse Telegraph Club is an international non-profit organization dedicated to the perpetuation of the knowledge and traditions of telegraphy.)
- Shilling's telegraph, an exhibit of the A.S. Popov Central Museum of Communications
- History of electromagnetic telegraph
- The first electric telegraphs
- The Dawn of Telegraphy (in Russian)
- Pavel Shilling and his telegraph- article in PCWeek, Russian edition.
- Distant Writing - The History of the Telegraph Companies in Britain between 1838 and 1868
- NASA - Carrington Super Flare NASA 6 May 2008
- How Cables Unite The World - a 1902 article about telegraph networks and technology from the magazine The World's Work
- New International Encyclopedia. 1905. .