Telegraphy
Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pigeon post is not. Ancient signalling systems, although sometimes quite extensive and sophisticated as in China, were generally not capable of transmitting arbitrary text messages. Possible messages were fixed and predetermined, so such systems are thus not true telegraphs.
The earliest true telegraph put into widespread use was the
The
Telegrams became a popular means of sending messages once telegraph prices had fallen sufficiently. Traffic became high enough to spur the development of automated systems—teleprinters and punched tape transmission. These systems led to new telegraph codes, starting with the Baudot code. However, telegrams were never able to compete with the letter post on price, and competition from the telephone, which removed their speed advantage, drove the telegraph into decline from 1920 onwards. The few remaining telegraph applications were largely taken over by alternatives on the internet towards the end of the 20th century.
Terminology
The word telegraph (from
A telegraph is a device for transmitting and receiving messages over long distances, i.e., for telegraphy. The word telegraph alone generally refers to an electrical telegraph. Wireless telegraphy is transmission of messages over radio with telegraphic codes.
Contrary to the extensive definition used by Chappe, Morse argued that the term telegraph can strictly be applied only to systems that transmit and record messages at a distance. This is to be distinguished from semaphore, which merely transmits messages. Smoke signals, for instance, are to be considered semaphore, not telegraph. According to Morse, telegraph dates only from 1832 when Pavel Schilling invented one of the earliest electrical telegraphs.[3]
A telegraph message sent by an electrical telegraph operator or telegrapher using Morse code (or a printing telegraph operator using plain text) was known as a telegram. A cablegram was a message sent by a submarine telegraph cable,[4] often shortened to "cable" or "wire". The suffix -gram is derived from ancient Greek: γραμμα (gramma), meaning something written, i.e. telegram means something written at a distance and cablegram means something written via a cable, whereas telegraph implies the process of writing at a distance.
Later, a Telex was a message sent by a Telex network, a switched network of teleprinters similar to a telephone network.
A
These continue to be called telegrams or cables regardless of the method used for transmission.History
Early signalling
Passing messages by signalling over distance is an ancient practice. One of the oldest examples is the signal towers of the
Signal fires were widely used in Europe and elsewhere for military purposes. The Roman army made frequent use of them, as did their enemies, and the remains of some of the stations still exist. Few details have been recorded of European/Mediterranean signalling systems and the possible messages. One of the few for which details are known is a system invented by Aeneas Tacticus (4th century BC). Tacticus's system had water filled pots at the two signal stations which were drained in synchronisation. Annotation on a floating scale indicated which message was being sent or received. Signals sent by means of torches indicated when to start and stop draining to keep the synchronisation.[9]
None of the signalling systems discussed above are true telegraphs in the sense of a system that can transmit arbitrary messages over arbitrary distances. Lines of signalling relay stations can send messages to any required distance, but all these systems are limited to one extent or another in the range of messages that they can send. A system like flag semaphore, with an alphabetic code, can certainly send any given message, but the system is designed for short-range communication between two persons. An engine order telegraph, used to send instructions from the bridge of a ship to the engine room, fails to meet both criteria; it has a limited distance and very simple message set. There was only one ancient signalling system described that does meet these criteria. That was a system using the Polybius square to encode an alphabet. Polybius (2nd century BC) suggested using two successive groups of torches to identify the coordinates of the letter of the alphabet being transmitted. The number of said torches held up signalled the grid square that contained the letter. There is no definite record of the system ever being used, but there are several passages in ancient texts that some think are suggestive. Holzmann and Pehrson, for instance, suggest that Livy is describing its use by Philip V of Macedon in 207 BC during the First Macedonian War. Nothing else that could be described as a true telegraph existed until the 17th century.[9][10]: 26–29 Possibly the first alphabetic telegraph code in the modern era is due to Franz Kessler who published his work in 1616. Kessler used a lamp placed inside a barrel with a moveable shutter operated by the signaller. The signals were observed at a distance with the newly invented telescope.[10]: 32–34
Optical telegraph
An optical telegraph is a telegraph consisting of a line of stations in towers or natural high points which signal to each other by means of shutters or paddles. Signalling by means of indicator pointers was called semaphore. Early proposals for an optical telegraph system were made to the Royal Society by Robert Hooke in 1684[11] and were first implemented on an experimental level by Sir Richard Lovell Edgeworth in 1767.[12] The first successful optical telegraph network was invented by Claude Chappe and operated in France from 1793.[13] The two most extensive systems were Chappe's in France, with branches into neighbouring countries, and the system of Abraham Niclas Edelcrantz in Sweden.[10]: ix–x, 47
During 1790–1795, at the height of the French Revolution, France needed a swift and reliable communication system to thwart the war efforts of its enemies. In 1790, the Chappe brothers set about devising a system of communication that would allow the central government to receive intelligence and to transmit orders in the shortest possible time. On 2 March 1791, at 11 am, they sent the message "si vous réussissez, vous serez bientôt couverts de gloire" (If you succeed, you will soon bask in glory) between Brulon and Parce, a distance of 16 kilometres (10 mi). The first means used a combination of black and white panels, clocks, telescopes, and codebooks to send their message.
In 1792, Claude was appointed Ingénieur-Télégraphiste and charged with establishing a line of stations between Paris and Lille, a distance of 230 kilometres (140 mi). It was used to carry dispatches for the war between France and Austria. In 1794, it brought news of a French capture of Condé-sur-l'Escaut from the Austrians less than an hour after it occurred.[14] A decision to replace the system with an electric telegraph was made in 1846, but it took a decade before it was fully taken out of service. The fall of Sevastopol was reported by Chappe telegraph in 1855.[10]: 92–94
The Prussian system was put into effect in the 1830s. However, they were highly dependent on good weather and daylight to work and even then could accommodate only about two words per minute. The last commercial semaphore link ceased operation in Sweden in 1880. As of 1895, France still operated coastal commercial semaphore telegraph stations, for ship-to-shore communication.[15]
Electrical telegraph
The early ideas for an electric telegraph included in 1753 using
Eventually, electrostatic telegraphs were abandoned in favour of
The first commercial telegraph was by Cooke and Wheatstone following their English patent of 10 June 1837. It was demonstrated on the London and Birmingham Railway in July of the same year.[24] In July 1839, a five-needle, five-wire system was installed to provide signalling over a record distance of 21 km on a section of the Great Western Railway between London Paddington station and West Drayton.[25][26] However, in trying to get railway companies to take up his telegraph more widely for railway signalling, Cooke was rejected several times in favour of the more familiar, but shorter range, steam-powered pneumatic signalling. Even when his telegraph was taken up, it was considered experimental and the company backed out of a plan to finance extending the telegraph line out to Slough. However, this led to a breakthrough for the electric telegraph, as up to this point the Great Western had insisted on exclusive use and refused Cooke permission to open public telegraph offices. Cooke extended the line at his own expense and agreed that the railway could have free use of it in exchange for the right to open it up to the public.[20]: 19–20
Most of the early electrical systems required multiple wires (Ronalds' system was an exception), but the system developed in the United States by
The electric telegraph quickly became a means of more general communication. The Morse system was officially adopted as the standard for continental European telegraphy in 1851 with a revised code, which later became the basis of
Railway telegraphy
Railway signal telegraphy was developed in Britain from the 1840s onward. It was used to manage railway traffic and to prevent accidents as part of the railway signalling system. On 12 June 1837 Cooke and Wheatstone were awarded a patent for an electric telegraph.[30] This was demonstrated between Euston railway station—where Wheatstone was located—and the engine house at Camden Town—where Cooke was stationed, together with Robert Stephenson, the London and Birmingham Railway line's chief engineer. The messages were for the operation of the rope-haulage system for pulling trains up the 1 in 77 bank. The world's first permanent railway telegraph was completed in July 1839 between London Paddington and West Drayton on the Great Western Railway with an electric telegraph using a four-needle system.
The concept of a
Wigwag
Wigwag is a form of
Heliograph
A
Another type of heliograph was the heliostat or heliotrope fitted with a Colomb shutter. The heliostat was essentially a surveying instrument with a fixed mirror and so could not transmit a code by itself. The term heliostat is sometimes used as a synonym for heliograph because of this origin. The Colomb shutter (Bolton and Colomb, 1862) was originally invented to enable the transmission of morse code by signal lamp between Royal Navy ships at sea.[34]
The heliograph was heavily used by Nelson A. Miles in Arizona and New Mexico after he took over command (1886) of the fight against Geronimo and other Apache bands in the Apache Wars. Miles had previously set up the first heliograph line in the US between Fort Keogh and Fort Custer in Montana. He used the heliograph to fill in vast, thinly populated areas that were not covered by the electric telegraph. Twenty-six stations covered an area 320 by 480 km (200 by 300 mi). In a test of the system, a message was relayed 640 km (400 mi) in four hours. Miles' enemies used smoke signals and flashes of sunlight from metal, but lacked a sophisticated telegraph code.[35] The heliograph was ideal for use in the American Southwest due to its clear air and mountainous terrain on which stations could be located. It was found necessary to lengthen the morse dash (which is much shorter in American Morse code than in the modern International Morse code) to aid differentiating from the morse dot.[34]
Use of the heliograph declined from 1915 onwards, but remained in service in Britain and
Teleprinter
A teleprinter is a telegraph machine that can send messages from a typewriter-like keyboard and print incoming messages in readable text with no need for the operators to be trained in the telegraph code used on the line. It developed from various earlier printing telegraphs and resulted in improved transmission speeds.
Early teleprinters used the
Automated punched-tape transmission
In a punched-tape system, the message is first typed onto punched tape using the code of the telegraph system—Morse code for instance. It is then, either immediately or at some later time, run through a transmission machine which sends the message to the telegraph network. Multiple messages can be sequentially recorded on the same run of tape. The advantage of doing this is that messages can be sent at a steady, fast rate making maximum use of the available telegraph lines. The economic advantage of doing this is greatest on long, busy routes where the cost of the extra step of preparing the tape is outweighed by the cost of providing more telegraph lines. The first machine to use punched tape was Bain's teleprinter (Bain, 1843), but the system saw only limited use. Later versions of Bain's system achieved speeds up to 1000 words per minute, far faster than a human operator could achieve.[40]
The first widely used system (Wheatstone, 1858) was first put into service with the British General Post Office in 1867. A novel feature of the Wheatstone system was the use of bipolar encoding. That is, both positive and negative polarity voltages were used.[41] Bipolar encoding has several advantages, one of which is that it permits duplex communication.[42] The Wheatstone tape reader was capable of a speed of 400 words per minute.[43]: 190
Oceanic telegraph cables
A worldwide communication network meant that telegraph cables would have to be laid across oceans. On land cables could be run uninsulated suspended from poles. Underwater, a good insulator that was both flexible and capable of resisting the ingress of seawater was required. A solution presented itself with
Getting a cable across the Atlantic Ocean proved much more difficult. The Atlantic Telegraph Company, formed in London in 1856, had several failed attempts. A cable laid in 1858 worked poorly for a few days, sometimes taking all day to send a message despite the use of the highly sensitive mirror galvanometer developed by William Thomson (the future Lord Kelvin) before being destroyed by applying too high a voltage. Its failure and slow speed of transmission prompted Thomson and Oliver Heaviside to find better mathematical descriptions of long transmission lines.[46] The company finally succeeded in 1866 with an improved cable laid by SS Great Eastern, the largest ship of its day, designed by Isambard Kingdom Brunel.[47][46]
An overland telegraph from Britain to India was first connected in 1866 but was unreliable so a submarine telegraph cable was connected in 1870.
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.[50] 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.[51] During World War I, Britain's telegraph communications were almost completely uninterrupted while it was able to quickly cut Germany's cables worldwide.[50]
Facsimile
In 1843, Scottish inventor
In 1881, English inventor Shelford Bidwell constructed the scanning phototelegraph that was the first telefax machine to scan any two-dimensional original, not requiring manual plotting or drawing. Around 1900, German physicist Arthur Korn invented the Bildtelegraph widespread in continental Europe especially since a widely noticed transmission of a wanted-person photograph from Paris to London in 1908 used until the wider distribution of the radiofax. Its main competitors were the Bélinographe by Édouard Belin first, then since the 1930s, the Hellschreiber, invented in 1929 by German inventor Rudolf Hell, a pioneer in mechanical image scanning and transmission.
Wireless telegraphy
The late 1880s through to the 1890s saw the discovery and then development of a newly understood phenomenon into a form of
At the end of 1894, the young Italian inventor
On 13 May 1897, Marconi, assisted by George Kemp, a Cardiff Post Office engineer, transmitted the first wireless signals over water to Lavernock (near Penarth in Wales) from Flat Holm.[58] His star rising, he was soon sending signals across the English Channel (1899), from shore to ship (1899) and finally across the Atlantic (1901).[59] A study of these demonstrations of radio, with scientists trying to work out how a phenomenon predicted to have a short range could transmit "over the horizon", led to the discovery of a radio reflecting layer in the Earth's atmosphere in 1902, later called the ionosphere.[60]
Radiotelegraphy proved effective for rescue work in sea disasters by enabling effective communication between ships and from ship to shore. In 1904, Marconi began the first commercial service to transmit nightly news summaries to subscribing ships, which could incorporate them into their on-board newspapers. A regular transatlantic radio-telegraph service was finally begun on 17 October 1907.[61][62] Notably, Marconi's apparatus was used to help rescue efforts after the sinking of RMS Titanic. Britain's postmaster-general summed up, referring to the Titanic disaster, "Those who have been saved, have been saved through one man, Mr. Marconi...and his marvellous invention."
Non-radio wireless telegraphy
The successful development of radiotelegraphy was preceded by a 50-year history of ingenious but ultimately unsuccessful experiments by inventors to achieve wireless telegraphy by other means.
Ground, water, and air conduction
Several wireless electrical signaling schemes based on the (sometimes erroneous) idea that electric currents could be conducted long-range through water, ground, and air were investigated for telegraphy before practical radio systems became available.
The original telegraph lines used two wires between the two stations to form a complete
US inventors William Henry Ward (1871) and Mahlon Loomis (1872) developed electrical conduction systems based on the erroneous belief that there was an electrified atmospheric stratum accessible at low altitude.[64][65] They thought atmosphere current, connected with a return path using "Earth currents" would allow for wireless telegraphy as well as supply power for the telegraph, doing away with artificial batteries.[66][67] A more practical demonstration of wireless transmission via conduction came in Amos Dolbear's 1879 magneto electric telephone that used ground conduction to transmit over a distance of a quarter of a mile.[68]
In the 1890s inventor Nikola Tesla worked on an air and ground conduction wireless electric power transmission system, similar to Loomis',[69][70][71] which he planned to include wireless telegraphy. Tesla's experiments had led him to incorrectly conclude that he could use the entire globe of the Earth to conduct electrical energy[72][68] and his 1901 large scale application of his ideas, a high-voltage wireless power station, now called Wardenclyffe Tower, lost funding and was abandoned after a few years.
Telegraphic communication using earth conductivity was eventually found to be limited to impractically short distances, as was communication conducted through water, or between trenches during World War I.
Electrostatic and electromagnetic induction
Both electrostatic and electromagnetic induction were used to develop wireless telegraph systems that saw limited commercial application. In the United States,
The most successful creator of an electromagnetic induction telegraph system was
Telegram services
A telegram service is a company or public entity that delivers telegraphed messages directly to the recipient. Telegram services were not inaugurated until
Historically, telegrams were sent between a network of interconnected telegraph offices. A person visiting a local telegraph office paid by the word to have a message telegraphed to another office and delivered to the addressee on a paper form.[76]: 276 Messages sent by telegraph could be delivered by telegram messenger faster than mail,[39] and even in the telephone age, the telegram remained popular for social and business correspondence. At their peak in 1929, an estimated 200 million telegrams were sent.[76]: 274
In 1919, the Central Bureau for Registered Addresses was established in the financial district of New York City. The bureau was created to ease the growing problem of messages being delivered to the wrong recipients. To combat this issue, the bureau offered telegraph customers the option to register unique code names for their telegraph addresses. Customers were charged $2.50 per year per code. By 1934, 28,000 codes had been registered.[77]
Telegram services still operate in much of the world (see worldwide use of telegrams by country), but e-mail and text messaging have rendered telegrams obsolete in many countries, and the number of telegrams sent annually has been declining rapidly since the 1980s.[78] Where telegram services still exist, the transmission method between offices is no longer by telegraph, but by telex or IP link.[79]
Telegram length
As telegrams have been traditionally charged by the word, messages were often abbreviated to pack information into the smallest possible number of words, in what came to be called "telegram style".
The average length of a telegram in the 1900s in the US was 11.93 words; more than half of the messages were 10 words or fewer.[80] According to another study, the mean length of the telegrams sent in the UK before 1950 was 14.6 words or 78.8 characters.[81] For German telegrams, the mean length is 11.5 words or 72.4 characters.[81] At the end of the 19th century, the average length of a German telegram was calculated as 14.2 words.[81]
Telex
Decline
Telegraph use began to permanently decline around 1920.
There was a brief resurgence in telegraphy during
Social implications
Optical telegraph lines were installed by governments, often for a military purpose, and reserved for official use only. In many countries, this situation continued after the introduction of the electric telegraph. Starting in Germany and the UK, electric telegraph lines were installed by railway companies. Railway use quickly led to private telegraph companies in the UK and the US offering a telegraph service to the public using telegraph along railway lines. The availability of this new form of communication brought on widespread social and economic changes.
The electric telegraph freed communication from the time constraints of postal mail and revolutionized the global economy and society.[85][86] By the end of the 19th century, the telegraph was becoming an increasingly common medium of communication for ordinary people. The telegraph isolated the message (information) from the physical movement of objects or the process.[87]
There was some fear of the new technology. According to author Allan J. Kimmel, some people "feared that the telegraph would erode the quality of public discourse through the transmission of irrelevant, context-free information." Henry David Thoreau thought of the Transatlantic cable "...perchance the first news that will leak through into the broad flapping American ear will be that Princess Adelaide has the whooping cough." Kimmel says these fears anticipate many of the characteristics of the modern internet age.[88]
Initially, the telegraph was expensive, but it had an enormous effect on three industries: finance, newspapers, and railways. Telegraphy facilitated the growth of organizations "in the railroads, consolidated financial and commodity markets, and reduced information costs within and between firms".[86] In the US, there were 200 to 300 stock exchanges before the telegraph, but most of these were unnecessary and unprofitable once the telegraph made financial transactions at a distance easy and drove down transaction costs.[76]: 274–75 This immense growth in the business sectors influenced society to embrace the use of telegrams once the cost had fallen.
Worldwide telegraphy changed the gathering of information for news reporting. Journalists were using the telegraph for war reporting as early as 1846 when the Mexican–American War broke out. News agencies were formed, such as the Associated Press, for the purpose of reporting news by telegraph.[76]: 274–75 Messages and information would now travel far and wide, and the telegraph demanded a language "stripped of the local, the regional; and colloquial", to better facilitate a worldwide media language.[87] Media language had to be standardized, which led to the gradual disappearance of different forms of speech and styles of journalism and storytelling.
The spread of the railways created a need for an accurate standard time to replace local standards based on local noon. The means of achieving this synchronisation was the telegraph. This emphasis on precise time has led to major societal changes such as the concept of the time value of money.[76]: 273–74
During the telegraph era there was widespread employment of women in telegraphy. The shortage of men to work as telegraph operators in the American Civil War opened up the opportunity for women of a well-paid skilled job.[76]: 274 In the UK, there was widespread employment of women as telegraph operators even earlier – from the 1850s by all the major companies. The attraction of women for the telegraph companies was that they could pay them less than men. Nevertheless, the jobs were popular with women for the same reason as in the US; most other work available for women was very poorly paid.[38]: 77 [20]: 85
The economic impact of the telegraph was not much studied by economic historians until parallels started to be drawn with the rise of the internet. In fact, the electric telegraph was as important as the invention of printing in this respect. According to economist Ronnie J. Phillips, the reason for this may be that institutional economists paid more attention to advances that required greater capital investment. The investment required to build railways, for instance, is orders of magnitude greater than that for the telegraph.[76]: 269–70
Popular culture
The optical telegraph was quickly forgotten once it went out of service. While it was in operation, it was very familiar to the public across Europe. Examples appear in many paintings of the period. Poems include "Le Telégraphe" by Victor Hugo, and the collection Telegrafen: Optisk kalender för 1858 by Elias Sehlstedt[89] is dedicated to the telegraph. In novels, the telegraph is a major component in Lucien Leuwen by Stendhal, and it features in The Count of Monte Cristo, by Alexandre Dumas.[10]: vii–ix Joseph Chudy's 1796 opera, Der Telegraph oder die Fernschreibmaschine, was written to publicise Chudy's telegraph (a binary code with five lamps) when it became clear that Chappe's design was being taken up.[10]: 42–43
Rudyard Kipling wrote a poem in praise of submarine telegraph cables; "And a new Word runs between: whispering, 'Let us be one!'"[90][91] Kipling's poem represented a widespread idea in the late nineteenth century that international telegraphy (and new technology in general)[92] would bring peace and mutual understanding to the world.[93] When a submarine telegraph cable first connected America and Britain, the Post[clarification needed] declared
It is the harbinger of an age when international difficulties will not have time to ripen into bloody results, and when, in spite of the fatuity and perveseness of rulers, war will be impossible.[94]
Newspaper names
Numerous newspapers and news outlets in various countries, such as
See also
References
- ^ "History and technology of Morse Code". EDinformatics.
- ISBN 9780313320156.
- OCLC 769828711.
- ^ "Cablegram – Definition of cablegram by Merriam-Webster". merriam-webster.com. 27 July 2023.
- ABS–CBN Corporation. 29 November 2010. Retrieved 29 November 2010.
- ISBN 978-0-949757-89-0.
(n.) 4. a telegram sent abroad, especially by submarine cable. (v.) 9. to send a message by submarine cable.
- ISBN 1851097325.
- ISBN 9004285296.
- ^ ISBN 1851097325.
- ^ ISBN 0818667826.
- ^ "The Origin of the Railway Semaphore". Mysite.du.edu. Retrieved 17 June 2013.
- ISBN 978-0-86341-330-8.
- ^ "Semaphore | communications". Encyclopedia Britannica.
- ^ How Napoleon's semaphore telegraph changed the world Archived 24 August 2019 at the Wayback Machine, BBC News, Hugh Schofield, 16 June 2013
- ^ "A Semaphore Telegraph Station", Scientific American Supplement, 20 April 1895, page 16087.
- ^ E. A. Marland, Early Electrical Communication, Abelard-Schuman Ltd, London 1964, no ISBN, Library of Congress 64-20875, pages 17–19;
- ^ Jones, R. Victor Samuel Thomas von Sömmering's "Space Multiplexed" Electrochemical Telegraph (1808–10) Archived 11 October 2012 at the Wayback Machine, Harvard University website. Attributed to "Semaphore to Satellite", International Telecommunication Union, Geneva 1965.
- ^ Fahie, J. J. (1884), A History of Electric Telegraphy to the year 1837 (PDF), London: E. & F. N. Spon
- S2CID 113256632.
- ^ OCLC 655205099.
- ISBN 9781317721826.
- ^ "Milestones:Shilling's Pioneering Contribution to Practical Telegraphy, 1828–1837". IEEE Global History Network. IEEE. Retrieved 26 July 2011.
- ^ R. W. Pohl, Einführung in die Physik, Vol. 3, Göttingen (Springer) 1924
- ^ S2CID 85499543.
- ^ a b c Anton A. Huurdeman, The Worldwide History of Telecommunications (2003) pp. 67–69
- ^ Roberts, Steven, Distant Writing
- ^ Watson, J.; Hill, A. (2015). Dictionary of Media and Communication Studies (9th ed.). London, UK: Bloomsbury – via Credo Reference.
- ^ "The First Transcontinental Telegraph System Was Completed October 24, 1861". America's Library. Retrieved 29 April 2019.
- ^ ISBN 0-78641808-7.
- ^ How the UK's railways shaped the development of the telegraph, British Telecom
- ^ Roberts, Steven, Distant Writing: 15. Railway Signal Telegraphy 1838 – 1868
- ISBN 0160872812.
- OCLC 680380148.
- ^ ISBN 1851097325.
- ISBN 0803281811.
- ^ "Typewriter May Soon Be Transmitter of Telegrams" (PDF), The New York Times, 25 January 1914
- ^ "David Edward Hughes". Clarkson University. 14 April 2007. Archived from the original on 22 April 2008.
- ^ ISBN 978-0-85296-792-8.
- ^ ISBN 1284055949.
- ISBN 0471205052.
- ISBN 0852967926.
- ISBN 0786418087.
- ^ ISBN 0-425-17169-8.
- ^ Haigh, K R (1968). Cable Ships and Submarine Cables. London: Adlard Coles Ltd. pp. 26–27.
- ^ a b Solymar, Laszlo. The Effect of the Telegraph on Law and Order, War, Diplomacy, and Power Politics Archived 16 October 2015 at the Wayback Machine in Interdisciplinary Science Reviews, Vol. 25, No. 3, pp. 204 f. 2000. Accessed 1 August 2014.
- ^ S2CID 41662509.
- ISBN 978-1-85573-301-5.
- ISBN 978-81-206-1930-2.
- ^ Briggs, Asa and Burke, Peter: "A Social History of the Media: From Gutenberg to the Internet", p110. Polity, Cambridge, 2005.
- ^ JSTOR 563928.
- ^ Headrick, D.R., & Griset, P. (2001). Submarine telegraph cables: business and politics, 1838–1939. The Business History Review, 75(3), 543–578.
- ^ "CASELLI". www.itisgalileiroma.it. Archived from the original on 17 August 2020. Retrieved 25 November 2013.
- ^ "The Institute of Chemistry - The Hebrew University of Jerusalem". huji.ac.il. Archived from the original on 6 May 2008.
- ^ "First Atlantic Ocean crossing by a wireless signal" Archived 26 March 2022 at the Wayback Machine. aerohistory.org. Retrieved 12 July 2012.
- Alexander Stepanovich Popov, amongst others (also Brian Regal, Radio: The Life Story of a Technology, page 22)
- ISBN 978-0-313-34743-6.
- ^ Sungook Hong. Wireless: From Marconi's Black-box to the Audion. MIT Press - 2001, page 21.
- ^ "Marconi: Radio Pioneer". BBC South East Wales. Retrieved 12 April 2008.
- .
- ISBN 978-1-4398-7897-2.
- ^ "The Clifden Station of the Marconi Wireless Telegraph System". Scientific American. 23 November 1907.
- ^ Second Test of the Marconi Over-Ocean Wireless System Proved Entirely Successful Archived 19 October 2013 at the Wayback Machine. Sydney Daily Post. 24 October 1907.
- ^ Fahie, J. J., A History of Wireless Telegraphy, 1838–1899, 1899, p. 29.
- ^ Christopher Cooper, The Truth About Tesla: The Myth of the Lone Genius in the History of Innovation, Race Point Publishing, 2015, pp. 154, 165
- ^ Theodore S. Rappaport, Brian D. Woerner, Jeffrey H. Reed, Wireless Personal Communications: Trends and Challenges, Springer Science & Business Media, 2012, pp. 211–215
- ^ Christopher Cooper, The Truth About Tesla: The Myth of the Lone Genius in the History of Innovation, Race Point Publishing, 2015, p. 154
- ^ Thomas H. White, section 21, MAHLON LOOMIS
- ^ a b Christopher Cooper, The Truth About Tesla: The Myth of the Lone Genius in the History of Innovation, Race Point Publishing, 2015, p. 165 [ISBN missing]
- ^ Proceedings of the United States Naval Institute – Volume 78 – p. 87
- ^ W. Bernard Carlson, Tesla: Inventor of the Electrical Age, Princeton University Press – 2013, p. H-45
- ^ Marc J. Seifer, Wizard: The Life and Times of Nikola Tesla: Biography of a Genius, Citadel Press – 1996, p. 107
- ISBN 1400846552
- ^ (U.S. patent 465,971, Means for Transmitting Signals Electrically, US 465971 A, 1891
- New York Times, March 17, 1888, p. 8. Proquest Historical Newspapers (subscription). Retrieved February 6, 2008.
- ^ Christopher H. Sterling, Encyclopedia of Radio 3-Volume Set, Routledge – 2004, p. 833
- ^ a b c d e f g h i j k l Ronnie J. Phillips, "Digital technology and institutional change from the gilded age to modern times: The impact of the telegraph and the internet" Archived 8 August 2020 at the Wayback Machine, Journal of Economic Issues, vol. 34, iss. 2, pp. 267–89, June 2000.
- OCLC 689998325, retrieved 12 April 2021
- ISBN 978-0-802-71879-2.
- ^ "TELEGRAM NOT DEAD. STOP". Ars Technica. 19 June 2013. Retrieved 14 May 2019.
- ISBN 978-1-42140747-0.
- ^ ISBN 978-303911451-1.
- ^ "Telegraphy and Telex". siemens.com Global Website. Retrieved 14 October 2022.
- ^ Phillip R. Easterlin, "Telex in New York", Western Union Technical Review, April 1959: 45
- ^ a b "The End of The Telegraph Era". Britannica.
- ^ Downey, Gregory J. (2002) Telegraph Messenger Boys: Labor, Technology, and Geography, 1850–1950, Routledge, New York and London, p. 7
- ^ a b Economic History Encyclopedia (2010) "History of the U.S. Telegraph Industry", "EH.Net Encyclopedia: History of the U.S. Telegraph Industry". Archived from the original on 2 May 2006. Retrieved 14 December 2005.
- ^ a b Carey, James (1989). Communication as Culture, Routledge, New York and London, p. 210
- ISBN 1317607503.
- ISBN 9171201823.
- ^ Kipling, Rudyard. "The Seven Seas". Wikisource. Retrieved 8 August 2022.
- ISBN 0674033906.
- ISBN 0816632871.
- ISBN 0826353983.
- ISBN 0309167825.
Further reading
- Britton, John A. Cables, Crises, and the Press: The Geopolitics of the New International Information System in the Americas, 1866–1903. (University of New Mexico Press, 2013).
- Fari, Simone. Formative Years of the Telegraph Union (Cambridge Scholars Publishing, 2015).
- Fari, Simone. Victorian Telegraphy Before Nationalization (2014).
- Gorman, Mel. "Sir William O'Shaughnessy, Lord Dalhousie, and the establishment of the telegraph system in India." Technology and Culture 12.4 (1971): 581–601 online Archived 21 April 2021 at the Wayback Machine.
- Hindmarch-Watson, Katie. "Embodying Telegraphy in Late Victorian London." Information & Culture 55, no. 1 (2020): 10-29.
- Hochfelder, David, The Telegraph in America, 1832–1920 (Johns Hopkins University Press, 2012).
- Huurdeman, Anton A. The Worldwide History of Telecommunications (John Wiley & Sons, 2003)
- John, Richard R. Network Nation: Inventing American Telecommunications (Harvard University Press; 2010) 520 pages; the evolution of American telegraph and telephone networks.
- Kieve, Jeffrey L. (1973). The Electric Telegraph: a Social and Economic History. David and Charles. ISBN 0-7153-5883-9.
- Lew, B., and Cater, B. "The Telegraph, Co-ordination of Tramp Shipping, and Growth in World Trade, 1870–1910", European Review of Economic History 10 (2006): 147–73.
- Müller, Simone M., and Heidi JS Tworek. "'The telegraph and the bank': on the interdependence of global communications and capitalism, 1866–1914." Journal of Global History 10#2 (2015): 259–283.
- O'Hara, Glen. "New Histories of British Imperial Communication and the 'Networked World' of the 19th and Early 20th Centuries" History Compass (2010) 8#7pp 609–625, Historiography,
- Richardson, Alan J. "The cost of a telegram: Accounting and the evolution of international regulation of the telegraph." Accounting History 20#4 (2015): 405–429.
- ISBN 0-425-17169-8.
- Thompson, Robert Luther. Wiring a continent: The history of the telegraph industry in the United States, 1832–1866 (Princeton UP, 1947).
- Wenzlhuemer, Roland. "The Development of Telegraphy, 1870–1900: A European Perspective on a World History Challenge." History Compass 5#5 (2007): 1720–1742.
- Wenzlhuemer, Roland. Connecting the nineteenth-century world: The telegraph and globalization (Cambridge UP, 2013). online review
- Winseck, Dwayne R., and Robert M. Pike. Communication & Empire: Media, Markets & Globalization, 1860–1930 (2007), 429pp.
- The Victorian Internet: The Remarkable Story of the Telegraph and the Nineteenth Century's On-Line Pioneers, a book about the telegraph
Technology
- Armagnay, Henri (1908). "Phototelegraphy". Annual Report of the Board of Regents of the Smithsonian Institution: 197–207. Retrieved 7 August 2009.
- Dargan, J. "The Railway Telegraph", Australian Railway Historical Society Bulletin, March 1985 pp. 49–71
- Gray, Thomas (1892). "The Inventors Of The Telegraph And Telephone". Annual Report of the Board of Regents of the Smithsonian Institution: 639–659. Retrieved 7 August 2009.
- Pichler, Franz, Magneto-Electric Dial Telegraphs: Contributions of Wheatstone, Stoehrer and Siemens, The AWA Reviewvol. 26, (2013).
- Ross, Nelson E. HOW TO WRITE TELEGRAMS PROPERLY Archived 31 January 2013 at the Wayback Machine The Telegraph Office (1928)
- Wheen, Andrew;— DOT-DASH TO DOT.COM: How Modern Telecommunications Evolved from the Telegraph to the Internet (Springer, 2011) ISBN 978-1-4419-6759-6.
- Wilson, Geoffrey, The Old Telegraphs, Phillimore & Co Ltd 1976 ISBN 0-900592-79-6; a comprehensive history of the shutter, semaphore and other kinds of visual mechanical telegraphs.
External links
- Encyclopædia Britannica (11th ed.). 1911. .
- Telegraph at the Encyclopædia Britannica
- The Porthcurno Telegraph Museum (Archived 27 September 2013 at the Wayback Machine)—The biggest telegraph station in the world, now a museum
- Distant Writing—The History of the Telegraph Companies in Britain between 1838 and 1868
- Western Union Telegraph Company Records, 1820–1995—Archives Center, National Museum of American History, Smithsonian Institution.
- Early telegraphy and fax engineering, still operable in a German computer museum (Archived 20 April 2012 at the Wayback Machine)
- "Telegram Falls Silent Stop Era Ends Stop", The New York Times, 6 February 2006
- International Facilities of the American Carriers—an overview of the U.S. international cable network in 1950
- Elizabeth Bruton: "Communication Technology", in the 1914-1918-online. International Encyclopedia of the First World War