![Printing Telegraph](https://upload.wikimedia.org/wikipedia/commons/2/24/Printing_Telegraph.jpg)
Electrical telegraphs were point-to-point
text messaging
Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters, between two or more users of mobile devices, desktops/laptops, or another type of compatible compute ...
systems, primarily used from the 1840s until the late 20th century. It was the first electrical
telecommunications
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that fe ...
system and the most widely used of a number of early messaging systems called ''
telegraph
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 p ...
s'', that were devised to communicate text messages quicker than physical transportation. Electrical telegraphy can be considered to be the first example of
electrical engineering
Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems which use electricity, electronics, and electromagnetism. It emerged as an identifiable occupation in the l ...
.
Text telegraphy consisted of two or more geographically separated stations, called
telegraph office
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 p ...
s. The offices were connected by wires, usually supported overhead on
utility pole
A utility pole is a column or post typically made out of wood used to support overhead power lines and various other public utilities, such as electrical cable, optical fiber, fiber optic cable, and related equipment such as Distribution transfor ...
s. Many different electrical telegraph systems were invented, but the ones that became widespread fit into two broad categories. The first category consists of needle telegraphs in which a needle pointer is made to move electromagnetically with an
electric current
An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume. The moving pa ...
sent 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
The Cooke and Wheatstone telegraph was an early electrical telegraph system dating from the 1830s invented by English inventor William Fothergill Cooke and English scientist Charles Wheatstone. It was a form of needle telegraph, and the first te ...
, invented in 1837. The second category consists of armature systems in which the current activates a
telegraph sounder
A telegraph sounder is an antique electromechanical device used as a receiver on electrical telegraph lines during the 19th century. It was invented by Alfred Vail after 1850 to replace the previous receiving device, the cumbersome Morse registe ...
which makes a click. The archetype of this category was the Morse system, invented by
Samuel Morse
Samuel Finley Breese Morse (April 27, 1791 – April 2, 1872) was an American inventor and painter. After having established his reputation as a portrait painter, in his middle age Morse contributed to the invention of a single-wire telegraph ...
in 1838. In 1865, the Morse system became the standard for international communication using a modified code developed for German railways.
Electrical telegraphs were used by the emerging railway companies to develop train control systems, minimizing the chances of trains colliding with each other. This was built around the
signalling block system
Signalling block systems enable the safe and efficient operation of railways by preventing collisions between trains. The basic principle is that a track is broken up into a series of sections or "blocks". Only one train may occupy a block at a ...
with signal boxes along the line communicating with their neighbouring boxes by telegraphic sounding of
single-stroke bells and three-position
needle telegraph
A needle telegraph is an electrical telegraph that uses indicating needles moved electromagnetically as its means of displaying messages. It is one of the two main types of electromagnetic telegraph, the other being the armature system, as exem ...
instruments.
In the 1840s, the electrical telegraph superseded
optical telegraph
An optical telegraph is a line of stations, typically towers, for the purpose of conveying textual information by means of visual signals. There are two main types of such systems; the semaphore telegraph which uses pivoted indicator arms and ...
systems, becoming the standard way to send urgent messages. By the latter half of the century, most
developed nations
A developed country (or industrialized country, high-income country, more economically developed country (MEDC), advanced country) is a sovereign state that has a high quality of life, developed economy and advanced technological infrastruct ...
had created commercial telegraph networks with local telegraph offices in most cities and towns, allowing the public to send messages called
telegram
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 p ...
s addressed to any person in the country, for a fee.
Beginning in 1850,
submarine telegraph cables allowed for 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. Circa 1894, the electric telegraph led to
Guglielmo Marconi
Guglielmo Giovanni Maria Marconi, 1st Marquis of Marconi (; 25 April 187420 July 1937) was an Italians, Italian inventor and electrical engineering, electrical engineer, known for his creation of a practical radio wave-based Wireless telegrap ...
's invention of
wireless telegraphy
Wireless telegraphy or radiotelegraphy is transmission of text messages by radio waves, analogous to electrical telegraphy using cables. Before about 1910, the term ''wireless telegraphy'' was also used for other experimental technologies for ...
, the first means of
radiowave
Radio waves are a type of electromagnetic radiation with the longest wavelengths in the electromagnetic spectrum, typically with frequencies of 300 gigahertz (GHz) and below. At 300 GHz, the corresponding wavelength is 1 mm (shor ...
telecommunication.
In the early 20th century, manual telegraphy was slowly replaced by
teleprinter
A teleprinter (teletypewriter, teletype or TTY) is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point and point-to-multipoint configurations. Initia ...
networks. Increasing use of the
telephone
A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into e ...
pushed telegraphy into a few specialist uses. Use by the general public was mainly special occasion telegram greetings. The rise of the
internet
The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a '' network of networks'' that consists of private, pub ...
and usage of
email
Electronic mail (email or e-mail) is a method of exchanging messages ("mail") between people using electronic devices. Email was thus conceived as the electronic ( digital) version of, or counterpart to, mail, at a time when "mail" meant ...
in the 1990s largely put an end to dedicated telegraphy networks.
History
Precursors
Prior to the electric telegraph,
semaphore
Semaphore (; ) is the use of an apparatus to create a visual signal transmitted over distance. A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms. Semaphores can be used for telegraphy when arra ...
systems were used, including
beacons
A beacon is an intentionally conspicuous device designed to attract attention to a specific location. A common example is the lighthouse, which draws attention to a fixed point that can be used to navigate around obstacles or into port. More mod ...
,
smoke signal
The smoke signal is one of the oldest forms of long-distance communication. It is a form of visual communication used over a long distance. In general smoke signals are used to transmit news, signal danger, or to gather people to a common area ...
s,
flag semaphore
Flag semaphore (from the Ancient Greek () 'sign' and - (-) '-bearer') is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands. Inform ...
, and
optical telegraph
An optical telegraph is a line of stations, typically towers, for the purpose of conveying textual information by means of visual signals. There are two main types of such systems; the semaphore telegraph which uses pivoted indicator arms and ...
s for visual signals to communicate over distances of land.
An auditory predecessor was West African
talking drums
The talking drum is an Hourglass drum, hourglass-shaped drum from West Africa, whose pitch can be regulated to mimic the tone (linguistics), tone and Prosody (linguistics), prosody of human speech. It has two drumheads connected by leather t ...
. In the 19th century,
Yoruba
The Yoruba people (, , ) are a West African ethnic group that mainly inhabit parts of Nigeria, Benin, and Togo. The areas of these countries primarily inhabited by Yoruba are often collectively referred to as Yorubaland. The Yoruba constitute ...
drummers used talking drums to mimic human
tonal language
Language is a structured system of communication. The structure of a language is its grammar and the free components are its vocabulary. Languages are the primary means by which humans communicate, and may be conveyed through a variety of met ...
to communicate complex messages - usually regarding news of birth, ceremonies, and military conflict - over 4-5 mile distances.
Early work
![Soemmerring 1810 telegraph overview](https://upload.wikimedia.org/wikipedia/commons/a/a6/Soemmerring_1810_telegraph_overview.jpg)
From
early studies of electricity, electrical phenomena were known to travel with great speed, and many experimenters worked on the application of electricity to
communication
Communication (from la, communicare, meaning "to share" or "to be in relation with") is usually defined as the transmission of information. The term may also refer to the message communicated through such transmissions or the field of inquir ...
s at a distance. All the known effects of electricity—such as
sparks
Sparks may refer to:
Places
*Sparks, Georgia
* Sparks, Kansas
*Sparks, Kentucky
*Sparks, Maryland
* Sparks, Nebraska
*Sparks, Nevada
*Sparks, Oklahoma
*Sparks, Texas
* Sparks, Bell County, Texas
* Sparks, West Virginia
Books
* ''Sparks'' (Raffi ...
,
electrostatic attraction
Coulomb's inverse-square law, or simply Coulomb's law, is an experimental law of physics that quantifies the amount of force between two stationary, electrically charged particles. The electric force between charged bodies at rest is conventiona ...
,
chemical change
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, ...
s,
electric shock
Electrical injury is a physiological reaction caused by electric current passing through the body. The injury depends on the density of the current, tissue resistance and duration of contact. Very small currents may be imperceptible or produce ...
s, and later
electromagnetism
In physics, electromagnetism is an interaction that occurs between particles with electric charge. It is the second-strongest of the four fundamental interactions, after the strong force, and it is the dominant force in the interactions of a ...
—were applied to the problems of detecting controlled transmissions of electricity at various distances.
In 1753, an anonymous writer in the ''
Scots Magazine
''The Scots Magazine'' is a magazine containing articles on subjects of Scottish interest. It claims to be the oldest magazine in the world still in publication, although there have been several gaps in its publication history. It has reported on ...
'' 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
Pith, or medulla, is a tissue in the stem
Stem or STEM may refer to:
Plant structures
* Plant stem, a plant's aboveground axis, made of vascular tissue, off which leaves and flowers hang
* Stipe (botany), a stalk to support some other ...
balls at the far end. The writer has never been positively identified, but the letter was signed C.M. and posted from
Renfrew
Renfrew (; sco, Renfrew; gd, Rinn Friù) is a town west of Glasgow in the west central Lowlands of Scotland. It is the historic county town of Renfrewshire. Called the "Cradle of the Royal Stewarts" for its early link with Scotland's former ...
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 1774,
Georges-Louis Le Sage
Georges-Louis Le Sage (; 13 June 1724 – 9 November 1803) was a Genevan physicist and is most known for his theory of gravitation, for his invention of an electric telegraph and his anticipation of the kinetic theory of gases. Furthermore, he w ...
realised an early electric telegraph. The telegraph had a separate wire for each of the 26 letters of the
alphabet
An alphabet is a standardized set of basic written graphemes (called letters) that represent the phonemes of certain spoken languages. Not all writing systems represent language in this way; in a syllabary, each character represents a syll ...
and its range was only between two rooms of his home.
In 1800,
Alessandro Volta
Alessandro Giuseppe Antonio Anastasio Volta (, ; 18 February 1745 – 5 March 1827) was an Italian physicist, chemist and lay Catholic who was a pioneer of electricity and power who is credited as the inventor of the electric battery and the ...
invented the
voltaic pile
upright=1.2, Schematic diagram of a copper–zinc voltaic pile. The copper and zinc discs were separated by cardboard or felt spacers soaked in salt water (the electrolyte). Volta's original piles contained an additional zinc disk at the bottom, ...
, providing a
continuous current
Direct current (DC) is one-directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even ...
of
electricity
Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described ...
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
An electrostatic generator, or electrostatic machine, is an electrical generator that produces '' static electricity'', or electricity at high voltage and low continuous current. The knowledge of static electricity dates back to the earliest civ ...
, which with
Leyden jar
A Leyden jar (or Leiden jar, or archaically, sometimes Kleistian jar) is an electrical component that stores a high-voltage electric charge (from an external source) between electrical conductors on the inside and outside of a glass jar. It typi ...
s 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
German(s) may refer to:
* Germany (of or related to)
**Germania (historical use)
* Germans, citizens of Germany, people of German ancestry, or native speakers of the German language
** For citizens of Germany, see also German nationality law
**Ger ...
physician, anatomist and inventor
Samuel Thomas von Sömmering
Samuel ''Šəmūʾēl'', Tiberian: ''Šămūʾēl''; ar, شموئيل or صموئيل '; el, Σαμουήλ ''Samouḗl''; la, Samūēl is a figure who, in the narratives of the Hebrew Bible, plays a key role in the transition from the bibl ...
in 1809, based on an earlier, less robust design of 1804 by Spanish
polymath
A polymath ( el, πολυμαθής, , "having learned much"; la, homo universalis, "universal human") is an individual whose knowledge spans a substantial number of subjects, known to draw on complex bodies of knowledge to solve specific pro ...
and scientist
Francisco Salva Campillo
Francisco Salva Campillo (Catalan: Francesc Salvà i Campillo, July 12, 1751 – February 13, 1828) was a Spanish Catalan prominent late-Enlightenment period scientist known for working as a physician, physicist, meteorologist.
Early life and e ...
. 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
Hans Christian Ørsted ( , ; often rendered Oersted in English; 14 August 17779 March 1851) was a Danish physicist and chemist who discovered that electric currents create magnetic fields, which was the first connection found between electricity ...
discovered in 1820 that an electric current produces a magnetic field that will deflect a compass needle. In the same year
Johann Schweigger
Johann Salomo Christoph Schweigger (8 April 1779 – 6 September 1857) was a German chemist, physicist, and professor of mathematics born in Erlangen.
J.S.C.Schweigger was the son of Friedrich Christian Lorenz Schweigger, professor of theologie ...
invented the
galvanometer
A galvanometer is an electromechanical measuring instrument for electric current. Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely.
A galvanom ...
, with a coil of wire around a compass, that could be used as a sensitive indicator for an electric current. Also that year,
André-Marie Ampère
André-Marie Ampère (, ; ; 20 January 177510 June 1836) was a French physicist and mathematician who was one of the founders of the science of classical electromagnetism, which he referred to as "electrodynamics". He is also the inventor of nu ...
suggested that telegraphy could be achieved by placing small magnets under the ends of a set of wires, one pair of wires for each letter of the alphabet. He was apparently unaware of Schweigger's invention at the time, which would have made his system much more sensitive. In 1825,
Peter Barlow tried Ampère's idea but only got it to work over and declared it impractical. In 1830
William Ritchie improved on Ampère's design by placing the magnetic needles inside a coil of wire connected to each pair of conductors. He successfully demonstrated it, showing the feasibility of the electromagnetic telegraph, but only within a lecture hall.
In 1825,
William Sturgeon
William Sturgeon (22 May 1783 – 4 December 1850) was an English physicist and inventor who made the first electromagnets, and invented the first practical British electric motor.
Early life
Sturgeon was born on 22 May 1783 in Whittington, ...
invented the
electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the ...
, with a single winding of uninsulated wire on a piece of varnished
iron
Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in f ...
, which increased the magnetic force produced by electric current.
Joseph Henry
Joseph Henry (December 17, 1797– May 13, 1878) was an American scientist who served as the first Secretary of the Smithsonian Institution. He was the secretary for the National Institute for the Promotion of Science, a precursor of the Smith ...
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
The Albany Academy is an independent college preparatory day school for boys in Albany, New York, USA, enrolling students from Preschool (age 3) to Grade 12. It was established in 1813 by a charter signed by Mayor Philip Schuyler Van Rensselae ...
from 1826 to 1832, Henry first demonstrated the theory of the 'magnetic telegraph' by ringing a bell through of wire strung around the room in 1831.
In 1835,
Joseph Henry
Joseph Henry (December 17, 1797– May 13, 1878) was an American scientist who served as the first Secretary of the Smithsonian Institution. He was the secretary for the National Institute for the Promotion of Science, a precursor of the Smith ...
and
Edward Davy
Edward Davy (16 June 1806 – 26 January 1885) was an English physician, scientist, and inventor who played a prominent role in the development of telegraphy, and invented an electric relay.
Davy was born in Ottery St Mary, Devonshire, England, ...
independently invented the mercury dipping
electrical relay
A relay
Electromechanical relay schematic showing a control coil, four pairs of normally open and one pair of normally closed contacts
An automotive-style miniature relay with the dust cover taken off
A relay is an electrically operated switch ...
, in which a magnetic needle is dipped into a pot of mercury when an electric current passes through the surrounding coil. In 1837, Davy invented the much more practical metallic make-and-break relay which became the relay of choice in telegraph systems and a key component for periodically renewing weak signals. Davy demonstrated his telegraph system in
Regent's Park
Regent's Park (officially The Regent's Park) is one of the Royal Parks of London. It occupies of high ground in north-west Inner London, administratively split between the City of Westminster and the Borough of Camden (and historically betwee ...
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 infused with
potassium iodide
Potassium iodide is a chemical compound, medication, and dietary supplement. It is a medication used for treating hyperthyroidism, in radiation emergencies, and for protecting the thyroid gland when certain types of radiopharmaceuticals are us ...
and
calcium hypochlorite
Calcium hypochlorite is an inorganic compound with formula Ca(OCl)2. It is the main active ingredient of commercial products called bleaching powder, chlorine powder, or chlorinated lime, used for water treatment and as a bleaching agent. Thi ...
.
First working systems
![Dial of Ronalds' electric telegraph](https://upload.wikimedia.org/wikipedia/commons/4/4d/Dial_of_Ronalds%27_electric_telegraph.jpg)
The first working telegraph was built by the English inventor
Francis Ronalds
Sir Francis Ronalds FRS (21 February 17888 August 1873) was an English scientist and inventor, and arguably the first electrical engineer. He was knighted for creating the first working electric telegraph over a substantial distance. In 1816 ...
in 1816 and used static electricity. At the family home on
Hammersmith Mall, he set up a complete subterranean system in a long trench as well as an 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
Admiralty most often refers to:
*Admiralty, Hong Kong
*Admiralty (United Kingdom), military department in command of the Royal Navy from 1707 to 1964
*The rank of admiral
*Admiralty law
Admiralty can also refer to:
Buildings
* Admiralty, Traf ...
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.
![Pavel Shilling](https://upload.wikimedia.org/wikipedia/commons/c/ca/Pavel_Shilling.jpg)
The
Schilling telegraph
The Schilling telegraph is a needle telegraph invented by Pavel Schilling in the nineteenth century. It consists of a bank of needle instruments (six as developed for use in Russia) which between them display a binary code representing a letter or ...
, invented by
Baron Schilling
Baron Pavel Lvovitch Schilling (1786–1837), also known as Paul Schilling, was a Russian military officer and diplomat of Baltic German origin. The majority of his career was spent working for the imperial Russian Ministry of Foreign Aff ...
von Canstatt in 1832, was an early
needle telegraph
A needle telegraph is an electrical telegraph that uses indicating needles moved electromagnetically as its means of displaying messages. It is one of the two main types of electromagnetic telegraph, the other being the armature system, as exem ...
. It had a transmitting device that consisted of a keyboard with 16 black-and-white keys. These served for switching the electric current. The receiving instrument consisted of six
galvanometer
A galvanometer is an electromechanical measuring instrument for electric current. Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely.
A galvanom ...
s with magnetic needles, suspended from
silk
Silk is a natural protein fiber, some forms of which can be woven into textiles. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the coc ...
threads. The two 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 by reducing 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 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
Kronstadt (russian: Кроншта́дт, Kronshtadt ), also spelled Kronshtadt, Cronstadt or Kronštádt (from german: link=no, Krone for "crown" and ''Stadt'' for "city") is a Russian port city in Kronshtadtsky District of the federal city of ...
. 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
Binary may refer to:
Science and technology Mathematics
* Binary number, a representation of numbers using only two digits (0 and 1)
* Binary function, a function that takes two arguments
* Binary operation, a mathematical operation that t ...
system of signal transmission. His work was taken over and developed by
Moritz von Jacobi
Moritz Hermann or Boris Semyonovich (von) Jacobi (russian: Борис Семёнович Якоби; 21 September 1801, Potsdam – 10 March 1874, Saint Petersburg) was a Prussian and Russian Imperial engineer and physicist of Jewish descent. Jac ...
who invented telegraph equipment that was used by Tsar
Alexander III to connect the Imperial palace at
Tsarskoye Selo
Tsarskoye Selo ( rus, Ца́рское Село́, p=ˈtsarskəɪ sʲɪˈlo, a=Ru_Tsarskoye_Selo.ogg, "Tsar's Village") was the town containing a former residence of the Russian imperial family and visiting nobility, located south from the cen ...
and
Kronstadt Naval Base
Kronstadt (russian: Кроншта́дт, Kronshtadt ), also spelled Kronshtadt, Cronstadt or Kronštádt (from german: link=no, Krone for "crown" and ''Stadt'' for "city") is a Russian port city in Kronshtadtsky District of the federal city of ...
.
In 1833,
Carl Friedrich Gauss
Johann Carl Friedrich Gauss (; german: Gauß ; la, Carolus Fridericus Gauss; 30 April 177723 February 1855) was a German mathematician and physicist who made significant contributions to many fields in mathematics and science. Sometimes refer ...
, together with the physics professor
Wilhelm Weber in
Göttingen
Göttingen (, , ; nds, Chöttingen) is a college town, university city in Lower Saxony, central Germany, the Capital (political), capital of Göttingen (district), the eponymous district. The River Leine runs through it. At the end of 2019, t ...
installed a wire above the town's roofs. Gauss combined the
Poggendorff-Schweigger multiplicator with his magnetometer to build a more sensitive device, the
galvanometer
A galvanometer is an electromechanical measuring instrument for electric current. Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely.
A galvanom ...
. To change the direction of the electric current, he constructed a
commutator
In mathematics, the commutator gives an indication of the extent to which a certain binary operation fails to be commutative. There are different definitions used in group theory and ring theory.
Group theory
The commutator of two elements, a ...
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.
![Diagram of alphabet used in a 5 needle Cooke and Wheatstone Telegraph, indicating the letter G](https://upload.wikimedia.org/wikipedia/commons/b/b6/Diagram_of_alphabet_used_in_a_5_needle_Cooke_and_Wheatstone_Telegraph%2C_indicating_the_letter_G.png)
At first, Gauss and Weber used the telegraph to coordinate time, but soon they developed other signals and finally, their own alphabet. The alphabet was encoded in a binary code that 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
The University of Göttingen, officially the Georg August University of Göttingen, (german: Georg-August-Universität Göttingen, known informally as Georgia Augusta) is a public research university in the city of Göttingen, Germany. Founded ...
, 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
upright=1.2, Schematic diagram of a copper–zinc voltaic pile. The copper and zinc discs were separated by cardboard or felt spacers soaked in salt water (the electrolyte). Volta's original piles contained an additional zinc disk at the bottom, ...
, Gauss used an
induction
Induction, Inducible or Inductive may refer to:
Biology and medicine
* Labor induction (birth/pregnancy)
* Induction chemotherapy, in medicine
* Induced stem cells, stem cells derived from somatic, reproductive, pluripotent or other cell t ...
pulse, enabling him to transmit seven letters a minute instead of two. The inventors and university did not have the funds to develop the telegraph on their own, but they received funding from
Alexander von Humboldt
Friedrich Wilhelm Heinrich Alexander von Humboldt (14 September 17696 May 1859) was a German polymath, geographer, naturalist, explorer, and proponent of Romantic philosophy and science. He was the younger brother of the Prussian minister, p ...
.
Carl August Steinheil
Carl August von Steinheil (12 October 1801 – 14 September 1870) was a German physicist, inventor, engineer and astronomer.
Biography
Steinheil was born in Ribeauvillé, Alsace. He studied law in Erlangen since 1821. He then studied astronomy i ...
in
Munich
Munich ( ; german: München ; bar, Minga ) is the capital and most populous city of the States of Germany, German state of Bavaria. With a population of 1,558,395 inhabitants as of 31 July 2020, it is the List of cities in Germany by popu ...
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. Steinheil built a telegraph along the
Nuremberg - Fürth railway line
The Bavarian Ludwig Railway (''Bayerische Ludwigseisenbahn'' or ''Ludwigsbahn'') was the first steam-hauled railway opened in Germany. The ''Königlich privilegierte Ludwigs-Eisenbahn-Gesellschaft'' ("Royal Privileged Ludwig Railway Company ...
in 1838, the first
earth-return telegraph
Earth-return telegraph is the system whereby the return path for the electric current of a telegraph circuit is provided by connection to the earth through an earth electrode. Using earth return saves a great deal of money on installation cost ...
put into service.
By 1837,
William Fothergill Cooke
Sir William Fothergill Cooke (4 May 1806 – 25 June 1879) was an English inventor. He was, with Charles Wheatstone, the co-inventor of the Cooke-Wheatstone electrical telegraph, which was patented in May 1837. Together with John Ricardo he fo ...
and
Charles Wheatstone
Sir Charles Wheatstone FRS FRSE DCL LLD (6 February 1802 – 19 October 1875), was an English scientist and inventor of many scientific breakthroughs of the Victorian era, including the English concertina, the stereoscope (a device for di ...
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
Samuel Finley Breese Morse (April 27, 1791 – April 2, 1872) was an American inventor and painter. After having established his reputation as a portrait painter, in his middle age Morse contributed to the invention of a single-wire telegraph ...
independently developed and patented a recording electric telegraph in 1837. Morse's assistant
Alfred Vail
Alfred Lewis Vail (September 25, 1807 – January 18, 1859) was an American machinist and inventor. Along with Samuel Morse, Vail was central in developing and commercializing American telegraphy between 1837 and 1844.
Vail and Morse were the f ...
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
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
signalling
alphabet
An alphabet is a standardized set of basic written graphemes (called letters) that represent the phonemes of certain spoken languages. Not all writing systems represent language in this way; in a syllabary, each character represents a syll ...
. The first telegram in the United States was sent by Morse on 11 January 1838, across of wire at
Speedwell Ironworks
Speedwell Ironworks was an ironworks in Speedwell Village, on Speedwell Avenue (part of U.S. Route 202), just north of downtown Morristown, in Morris County, New Jersey, United States. At this site Alfred Vail and Samuel Morse first demonstrate ...
near Morristown, New Jersey, although it was only later, in 1844, that he sent the message "
WHAT HATH GOD WROUGHT
"What hath God wrought" is a translation of a phrase from the Book of Numbers (Numbers 23:23), and may refer to:
*"What hath God wrought", the official first Morse code message transmitted in the US on May 24, 1844, to officially open the Baltimor ...
" over the from the
Capitol
A capitol, named after the Capitoline Hill in Rome, is usually a legislative building where a legislature meets and makes laws for its respective political entity.
Specific capitols include:
* United States Capitol in Washington, D.C.
* Numerous ...
in Washington to the
old Mt. Clare Depot in
Baltimore
Baltimore ( , locally: or ) is the List of municipalities in Maryland, most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic (United States), Mid-Atlantic, and List of United States cities by popula ...
.
Commercial telegraphy
Cooke and Wheatstone system
![GWR Cooke and Wheatstone double needle telegraph instrument](https://upload.wikimedia.org/wikipedia/commons/e/ef/GWR_Cooke_and_Wheatstone_double_needle_telegraph_instrument.jpg)
The first commercial electrical telegraph was the
Cooke and Wheatstone system. A demonstration four-needle system was installed on the
Euston to
Camden Town
Camden Town (), often shortened to Camden, is a district of northwest London, England, north of Charing Cross. Historically in Middlesex, it is the administrative centre of the London Borough of Camden, and identified in the London Plan as o ...
section of
Robert Stephenson
Robert Stephenson Fellow of the Royal Society, FRS HFRSE FRSA Doctor of Civil Law, DCL (16 October 1803 – 12 October 1859) was an English civil engineer and designer of locomotives. The only son of George Stephenson, the "Father of Railway ...
's
London and Birmingham Railway
The London and Birmingham Railway (L&BR) was a railway company in the United Kingdom, in operation from 1833 to 1846, when it became part of the London and North Western Railway (L&NWR).
The railway line which the company opened in 1838, betw ...
in 1837 for signalling rope-hauling of locomotives. It was rejected in favour of pneumatic whistles.
[Bowers, page 129] Cooke and Wheatstone had their first commercial success with a system installed on the
Great Western Railway
The Great Western Railway (GWR) was a British railway company that linked London with the southwest, west and West Midlands of England and most of Wales. It was founded in 1833, received its enabling Act of Parliament on 31 August 1835 and ran ...
over the from
Paddington station
Paddington, also known as London Paddington, is a Central London railway terminus and London Underground station complex, located on Praed Street in the Paddington area. The site has been the London terminus of services provided by the Great We ...
to
West Drayton
West Drayton is a suburban town in the London Borough of Hillingdon. It was an ancient parish in the county of Middlesex and from 1929 was part of the Yiewsley and West Drayton Urban District, which became part of Greater London in 1965. The se ...
in 1838. This was a five-needle, six-wire
system. A major advantage of this system was it displayed the letter being sent so operators did not need to learn a code. This system suffered from failing insulation on the underground cables. When the line was extended to
Slough
Slough () is a town and unparished area in the unitary authority of the same name in Berkshire, England, bordering west London. It lies in the Thames Valley, west of central London and north-east of Reading, at the intersection of the M4 ...
in 1843, the telegraph was converted to a one-needle, two-wire system with uninsulated wires on poles. The cost of installing wires was ultimately more economically significant than the cost of training operators. 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 Electric Telegraph Company (ETC) was a British telegraph company founded in 1846 by William Fothergill Cooke and John Ricardo. It was the world's first public telegraph company. The equipment used was the Cooke and Wheatstone telegraph, ...
, the world's first public telegraphy company was formed in 1845 by financier
John Lewis Ricardo
John Lewis Ricardo (1812 – 2 August 1862) was a British businessman and politician.
He was the son of Jacob Ricardo and nephew of the economist David Ricardo. In 1841 he married Catherine Duff (c.1820 – 1869), the daughter of General Sir A ...
and Cooke.
Wheatstone ABC telegraph
![ABC machine](https://upload.wikimedia.org/wikipedia/commons/5/5b/ABC_machine.jpg)
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
A magneto is an electrical generator that uses permanent magnets to produce periodic pulses of alternating current. Unlike a dynamo, a magneto does not contain a commutator to produce direct current. It is categorized as a form of alternator, ...
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 advance the pointers at both ends 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
An escapement is a mechanical linkage in mechanical watches and clocks that gives impulses to the timekeeping element and periodically releases the gear train to move forward, advancing the clock's hands. The impulse action transfers energy to ...
. 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.
Morse system
![The first telegram](https://upload.wikimedia.org/wikipedia/commons/2/27/The_first_telegram._Professor_Samuel_Morse_sending_the_despatch_as_dictated_by_Miss_Annie_Ellsworth.jpg)
The Morse system uses a single wire between offices. At the sending station, an operator taps on a switch called a
telegraph key
A telegraph key is a specialized electrical switch used by a trained operator to transmit text messages in Morse code in a telegraphy system. Keys are used in all forms of electrical telegraph systems, including landline (also called wire) t ...
, spelling out text messages in
Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
. 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 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
international Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
adopted was considerably modified from the original
American Morse code
American Morse Code — also known as Railroad Morse—is the latter-day name for the original version of the Morse Code developed in the mid-1840s, by Samuel Morse and Alfred Vail for their electric telegraph. The "American" qualifier was added ...
, and was based on a code used on Hamburg railways (
Gerke Gerke may refer to:
* Friedrich Clemens Gerke (22 January 1801 – 21 May 1888) – German writer, journalist, musician and pioneer of telegraph
* Jack Gerke
Jack Gerke, (7 June 1916 – 14 February 2005) was an officer in the Australian Army, se ...
, 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
The Australian Overland Telegraph Line was a telegraphy system to send messages over long distances using cables and electric signals. It spanned between Darwin, in what is now the Northern Territory of Australia, and Adelaide, the capital o ...
connected the west coast of the continent to the east coast by 24 October 1861, bringing an end to the
Pony Express
The Pony Express was an American express mail service that used relays of horse-mounted riders. It operated from April 3, 1860, to October 26, 1861, between Missouri and California. It was operated by the Central Overland California and Pik ...
.
Foy–Breguet system
![Foy-Breguet telegraph display](https://upload.wikimedia.org/wikipedia/commons/f/fe/Foy-Breguet_telegraph_display.jpg)
France was slow to adopt the electrical telegraph, because of the extensive
optical telegraph
An optical telegraph is a line of stations, typically towers, for the purpose of conveying textual information by means of visual signals. There are two main types of such systems; the semaphore telegraph which uses pivoted indicator arms and ...
system built during the
Napoleonic era
The Napoleonic era is a period in the history of France and Europe. It is generally classified as including the fourth and final stage of the French Revolution, the first being the National Assembly, the second being the Legislative ...
. 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 completely until 1855. In that year the Foy-Breguet system was replaced with the Morse system.
Expansion
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 office
A post office is a public facility and a retailer that provides mail services, such as accepting letters and parcels, providing post office boxes, and selling postage stamps, packaging, and stationery. Post offices may offer additional serv ...
s. 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:
The New York and Mississippi Valley Printing Telegraph Company, for example, was created in 1852 in Rochester, New York and eventually became the
Western Union Telegraph Company
The Western Union Company is an American multinational financial services company, headquartered in Denver, Colorado.
Founded in 1851 as the New York and Mississippi Valley Printing Telegraph Company in Rochester, New York, the company chang ...
. 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.
Telegraphy was introduced in
Central Asia
Central Asia, also known as Middle Asia, is a subregion, region of Asia that stretches from the Caspian Sea in the west to western China and Mongolia in the east, and from Afghanistan and Iran in the south to Russia in the north. It includes t ...
during the 1870s.
Telegraphic improvements
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
Telegram style, telegraph style, telegraphic style, or telegraphese is a clipped way of writing which abbreviates words and packs information into the smallest possible number of words or characters. It originated in the telegraph age when telecom ...
.
The first system that did not require skilled technicians to operate was Charles Wheatstone's ABC system in 1840 in which 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 16 and a half words per minute, 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
Royal Earl House (9 September 181425 February 1895) was the inventor of the first printing telegraph, which is now kept in the Smithsonian Institution. His nephew Henry Alonzo House is also a noted early American inventor.
Royal Earl House spent ...
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
David Edward Hughes (16 May 1830 – 22 January 1900), was a British-American inventor, practical experimenter, and professor of music known for his work on the printing telegraph and the microphone. He is generally considered to have bee ...
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
The Baudot code is an early character encoding for telegraphy invented by Émile Baudot in the 1870s. It was the predecessor to the International Telegraph Alphabet No. 2 (ITA2), the most common teleprinter code in use until the advent of ASCII. ...
of 1874. French engineer
Émile Baudot
Jean-Maurice-Émile Baudot (; 11 September 1845 – 28 March 1903), French telegraph engineer and inventor of the first means of digital communication Baudot code, was one of the pioneers of telecommunications. He invented a multiplexed printi ...
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 were still limited to the skill of the human operator. The first practical automated system was patented by Charles Wheatstone. The message (in
Morse code
Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code is named after Samuel Morse, one of ...
) 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.
Teleprinters
![Teletype-IMG 7289](https://upload.wikimedia.org/wikipedia/commons/e/e6/Teletype-IMG_7289.jpg)
An early successful
teleprinter
A teleprinter (teletypewriter, teletype or TTY) is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point and point-to-multipoint configurations. Initia ...
was invented by
Frederick G. Creed Frederick George Creed (6 October 1871 – 11 December 1957) was a Canadian inventor, who spent most of his adult life in Britain. He worked in the field of telecommunications, and is particularly remembered as a key figure in the development of the ...
. In
Glasgow
Glasgow ( ; sco, Glesca or ; gd, Glaschu ) is the most populous city in Scotland and the fourth-most populous city in the United Kingdom, as well as being the 27th largest city by population in Europe. In 2020, it had an estimated popul ...
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 onto 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
The ''Daily Mail'' is a British daily middle-market tabloid newspaper and news websitePeter Wilb"Paul Dacre of the Daily Mail: The man who hates liberal Britain", ''New Statesman'', 19 December 2013 (online version: 2 January 2014) publish ...
'' for daily transmission of the newspaper contents.
With the invention of the
teletypewriter
A teleprinter (teletypewriter, teletype or TTY) is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point (telecommunications), point-to-point and point- ...
, telegraphic encoding became fully automated. Early teletypewriters used the ITA-1
Baudot code
The Baudot code is an early character encoding for telegraphy invented by Émile Baudot in the 1870s. It was the predecessor to the International Telegraph Alphabet No. 2 (ITA2), the most common teleprinter code in use until the advent of ASCII. ...
, 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.
In the 1930s, teleprinters were produced by
Teletype
A teleprinter (teletypewriter, teletype or TTY) is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point and point-to-multipoint configurations. Initia ...
in the US,
Creed
A creed, also known as a confession of faith, a symbol, or a statement of faith, is a statement of the shared beliefs of a community (often a religious community) in a form which is structured by subjects which summarize its core tenets.
The ea ...
in Britain and
Siemens
Siemens AG ( ) is a German multinational conglomerate corporation and the largest industrial manufacturing company in Europe headquartered in Munich with branch offices abroad.
The principal divisions of the corporation are ''Industry'', '' ...
in Germany.
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 systems were called "Telex" (TELegraph EXchange). Telex machines first performed rotary-telephone-style
pulse dialling
Pulse dialing is a signaling technology in telecommunications in which a direct current local loop circuit is interrupted according to a defined coding system for each signal transmitted, usually a digit. This lends the method the often used nam ...
for
circuit switching
Circuit switching is a method of implementing a telecommunications network in which two network nodes establish a dedicated communications channel ( circuit) through the network before the nodes may communicate. The circuit guarantees the full b ...
, and then sent data by
ITA2
The Baudot code is an early character encoding for telegraphy invented by Émile Baudot in the 1870s. It was the predecessor to the International Telegraph Alphabet No. 2 (ITA2), the most common teleprinter code in use until the advent of ASCII. ...
. 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
In telecommunication and electronics, baud (; symbol: Bd) is a common unit of measurement of symbol rate, which is one of the components that determine the speed of communication over a data channel.
It is the unit for symbol rate or modulatio ...
– considered speedy at the time – up to 25 telex channels could share a single long-distance telephone channel by using ''
voice frequency telegraphy
Analogue filters are a basic building block of signal processing much used in electronics. Amongst their many applications are the separation of an audio signal before application to bass, mid-range, and tweeter loudspeakers; the combining and ...
multiplexing
In telecommunications and computer networking, multiplexing (sometimes contracted to muxing) is a method by which multiple analog or digital signals are combined into one signal over a shared medium. The aim is to share a scarce resource - a ...
'', making telex the least expensive method of reliable long-distance communication.
Automatic teleprinter exchange service was introduced into Canada by
CPR Telegraphs and
CN Telegraph
The Canadian National Railway Company (french: Compagnie des chemins de fer nationaux du Canada) is a Canadian Class I freight railway headquartered in Montreal, Quebec, which serves Canada and the Midwestern and Southern United States.
CN i ...
in July 1957 and in 1958,
Western Union
The Western Union Company is an American multinational financial services company, headquartered in Denver, Colorado.
Founded in 1851 as the New York and Mississippi Valley Printing Telegraph Company in Rochester, New York, the company chang ...
started to build a Telex network in the United States.
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
Charles Bourseul (28 April 1829 – 23 November 1912) was a pioneer in development of the "make and break" telephone about 20 years before Bell made a practical telephone.
Bourseul was born in Brussels, Belgium, and grew up in Douai, France ...
,
Thomas Edison
Thomas Alva Edison (February 11, 1847October 18, 1931) was an American inventor and businessman. He developed many devices in fields such as electric power generation, mass communication, sound recording, and motion pictures. These inventio ...
,
Elisha Gray
Elisha Gray (August 2, 1835 – January 21, 1901) was an American electrical engineer who co-founded the Western Electric Manufacturing Company. Gray is best known for his development of a telephone prototype in 1876 in Highland Park, Illinois. ...
, and
Alexander Graham Bell
Alexander Graham Bell (, born Alexander Bell; March 3, 1847 – August 2, 1922) was a Scottish-born inventor, scientist and engineer who is credited with patenting the first practical telephone. He also co-founded the American Telephone and Te ...
.
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
In telecommunications, frequency-division multiplexing (FDM) is a technique by which the total bandwidth available in a communication medium is divided into a series of non-overlapping frequency bands, each of which is used to carry a separate ...
. 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
The invention of the telephone was the culmination of work done by more than one individual, and led to an array of lawsuits relating to the patent claims of several individuals and numerous companies.
Early development
The concept of th ...
. (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
![1891 Telegraph Lines](https://upload.wikimedia.org/wikipedia/commons/9/9a/1891_Telegraph_Lines.jpg)
Soon after the first successful telegraph systems were operational, the possibility of transmitting messages across the sea by way of
submarine communications cable
A submarine communications cable is a cable laid on the sea bed between land-based stations to carry telecommunication signals across stretches of ocean and sea. The first submarine communications cables laid beginning in the 1850s carried tel ...
s was first proposed. One of the primary technical challenges was to sufficiently insulate the submarine cable to prevent the electric current from leaking out into the water. In 1842, a Scottish surgeon
William Montgomerie
William Montgomerie (1797–1856) was a Scottish military doctor with the East India Company, and later head of the medical department at Singapore. He is best known for promoting the use of gutta-percha in Europe. This material was an import ...
introduced
gutta-percha
Gutta-percha is a tree of the genus ''Palaquium'' in the family Sapotaceae. The name also refers to the rigid, naturally biologically inert, resilient, electrically nonconductive, thermoplastic latex derived from the tree, particularly from ' ...
, the adhesive juice of the ''
Palaquium gutta
''Palaquium gutta'' is a tree in the family Sapotaceae. The specific epithet ' is from the Malay word ''getah'' meaning "sap or latex". It is known in Indonesia as ''karet oblong''.
Description
''Palaquium gutta'' grows up to tall. The bark is ...
'' tree, to Europe.
Michael Faraday
Michael Faraday (; 22 September 1791 – 25 August 1867) was an English scientist who contributed to the study of electromagnetism and electrochemistry. His main discoveries include the principles underlying electromagnetic inducti ...
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
Dover () is a town and major ferry port in Kent, South East England. It faces France across the Strait of Dover, the narrowest part of the English Channel at from Cap Gris Nez in France. It lies south-east of Canterbury and east of Maidstone ...
to
Calais
Calais ( , , traditionally , ) is a port city in the Pas-de-Calais department, of which it is a subprefecture. Although Calais is by far the largest city in Pas-de-Calais, the department's prefecture is its third-largest city of Arras. Th ...
. Gutta-percha was used as insulation on a wire laid across the
Rhine
), Surselva, Graubünden, Switzerland
, source1_coordinates=
, source1_elevation =
, source2 = Rein Posteriur/Hinterrhein
, source2_location = Paradies Glacier, Graubünden, Switzerland
, source2_coordinates=
, so ...
between
Deutz and
Cologne
Cologne ( ; german: Köln ; ksh, Kölle ) is the largest city of the German western States of Germany, state of North Rhine-Westphalia (NRW) and the List of cities in Germany by population, fourth-most populous city of Germany with 1.1 m ...
. In 1849,
C. V. Walker, electrician to the
South Eastern Railway, submerged a wire coated with gutta-percha off the coast from Folkestone, which was tested successfully.
[
]John Watkins Brett
John Watkins Brett (1805–1863) was an English telegraph engineer.
Life
Brett was the son of a cabinetmaker, William Brett of Bristol, and was born in that city in 1805. Brett is known as the founder of submarine telegraphy. He formed the Subm ...
, an engineer from Bristol
Bristol () is a city, ceremonial county and unitary authority in England. Situated on the River Avon, it is bordered by the ceremonial counties of Gloucestershire to the north and Somerset to the south. Bristol is the most populous city in ...
, sought and obtained permission from Louis-Philippe
Louis Philippe (6 October 1773 – 26 August 1850) was King of the French from 1830 to 1848, and the penultimate List of French monarchs#House of Orléans, July Monarchy (1830–1848), monarch of France.
As Louis Philippe, Duke of Chartres, h ...
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
The Atlantic Telegraph Company was a company formed on 6 November 1856 to undertake and exploit a commercial telegraph cable across the Atlantic ocean, the first such telecommunications link.
History
Cyrus Field, American businessman and finan ...
was formed in London
London is the capital and largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary down to the North Sea, and has been a majo ...
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. John Pender, one of the men on the Great Eastern, later founded several telecommunications companies primarily laying cables between Britain and Southeast Asia. Earlier transatlantic submarine cables Submarine cable is any electrical cable that is laid on the seabed, although the term is often extended to encompass cables laid on the bottom of large freshwater bodies of water.
Examples include:
*Submarine communications cable
*Submarine power ...
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 line
In electrical engineering, a transmission line is a specialized cable or other structure designed to conduct electromagnetic waves in a contained manner. The term applies when the conductors are long enough that the wave nature of the transmis ...
s. The telegraph lines from Britain to India were connected in 1870. (Those several companies combined to form the ''Eastern Telegraph Company'' in 1872.) The HMS ''Challenger'' expedition in 1873–1876 mapped the ocean floor for future underwater telegraph cables.
Australia was first linked to the rest of the world in October 1872 by a submarine telegraph cable at Darwin. This brought news reports 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
The All Red Line was a system of electrical telegraphs that linked much of the British Empire. It was inaugurated on 31 October 1902. The informal name derives from the common practice of colouring the territory of the British Empire red or ...
. 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
Sir John Pender KCMG GCMG FSA FRSE (10 September 1816 – 7 July 1896) was a Scottish submarine communications cable pioneer and politician.
Early life
He was born in the Vale of Leven, Scotland, the son of James Pender and his wife, Marion Ma ...
as the founder, although the name was only adopted in 1934. It was formed from successive mergers including:
*The Falmouth, Malta, Gibraltar Telegraph Company
*The British Indian Submarine Telegraph Company
*The Marseilles, Algiers and Malta Telegraph Company
*The Eastern Telegraph Company
*The Eastern Extension Australasia and China Telegraph Company
*The Eastern and Associated Telegraph Companies
Telegraphy and longitude
Main article § Section: .
The telegraph was very important for sending time signals to determine longitude, providing greater accuracy than previously available. Longitude was measured by comparing local time (for example local noon occurs when the sun is at its highest above the horizon) with absolute time (a time that is the same for an observer anywhere on earth). If the local times of two places differ by one hour, the difference in longitude between them is 15° (360°/24h). Before telegraphy, absolute time could be obtained from astronomical events, such as eclipses
An eclipse is an astronomical event that occurs when an astronomical object or spacecraft is temporarily obscured, by passing into the shadow of another body or by having another body pass between it and the viewer. This alignment of three ce ...
, occultations
An occultation is an event that occurs when one object is hidden from the observer by another object that passes between them. The term is often used in astronomy, but can also refer to any situation in which an object in the foreground blocks ...
or lunar distances, or by transporting an accurate clock (a chronometer
A clock or a timepiece is a device used to measure and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month and th ...
) from one location to the other.
The idea of using the telegraph to transmit a time signal for longitude determination was suggested by François Arago
Dominique François Jean Arago ( ca, Domènec Francesc Joan Aragó), known simply as François Arago (; Catalan: ''Francesc Aragó'', ; 26 February 17862 October 1853), was a French mathematician, physicist, astronomer, freemason, supporter of t ...
to Samuel Morse
Samuel Finley Breese Morse (April 27, 1791 – April 2, 1872) was an American inventor and painter. After having established his reputation as a portrait painter, in his middle age Morse contributed to the invention of a single-wire telegraph ...
in 1837, and the first test of this idea was made by Capt. Wilkes of the U.S. Navy in 1844, over Morse's line between Washington and Baltimore. The method was soon in practical use for longitude determination, in particular by the U.S. Coast Survey, and over longer and longer distances as the telegraph network spread across North America and the world, and as technical developments improved accuracy and productivity
The "telegraphic longitude net" soon became worldwide. Transatlantic links between Europe and North America were established in 1866 and 1870. The US Navy extended observations into the West Indies and Central and South America with an additional transatlantic link from South America to Lisbon between 1874 and 1890. British, Russian and US observations created a chain from Europe through Suez, Aden, Madras, Singapore, China and Japan, to Vladivostok, thence to Saint Petersburg and back to Western Europe.
Australia was linked to Singapore via Java in 1871 and the web circled the globe in 1902 with the connection of Australia and New Zealand to Canada via the All Red Line
The All Red Line was a system of electrical telegraphs that linked much of the British Empire. It was inaugurated on 31 October 1902. The informal name derives from the common practice of colouring the territory of the British Empire red or ...
. The double determination of longitudes from east to west and from west to east agreed within one second of arc ( second of time – less than 30 metres).
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 also geographical constraints on intercepting the telegraph cables that improved security, however once radio telegraphy was developed interception became far more widespread.
Crimean War
The Crimean War
The Crimean War, , was fought from October 1853 to February 1856 between Russia and an ultimately victorious alliance of the Ottoman Empire, France, the United Kingdom and Piedmont-Sardinia.
Geopolitical causes of the war included the de ...
was one of the first conflicts to use telegraphs
Telegraphs were an alternative rock band based in Brighton, England.
Biography
Formed in 2005, Telegraphs was made up of members Darcy Harrison (vocals), Hattie Williams (bass/vocals), Sam Bacon (drums), Darren LeWarne (guitar) and Aung Yay ...
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
The Corps of Royal Engineers, usually called the Royal Engineers (RE), and commonly known as the ''Sappers'', is a corps of the British Army. It provides military engineering and other technical support to the British Armed Forces and is heade ...
. 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
Sir William Howard Russell, (28 March 182011 February 1907) was an Irish reporter with ''The Times'', and is considered to have been one of the first modern war correspondents. He spent 22 months covering the Crimean War, including the Sieg ...
(writing for ''The Times
''The Times'' is a British daily national newspaper based in London. It began in 1785 under the title ''The Daily Universal Register'', adopting its current name on 1 January 1788. ''The Times'' and its sister paper ''The Sunday Times'' (fou ...
'' newspaper) with photographs by Roger Fenton
Roger Fenton (28 March 1819 – 8 August 1869) was a British photographer, noted as one of the first war photographers.
Fenton was born into a Lancashire merchant family. After graduating from London with an Arts degree, he became interested i ...
. 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
London is the capital and largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary down to the North Sea, and has been a majo ...
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 American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by states th ...
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
Fort Sumter is a sea fort built on an artificial island protecting Charleston, South Carolina from naval invasion. Its origin dates to the War of 1812 when the British invaded Washington by sea. It was still incomplete in 1861 when the Battl ...
, the South cut telegraph lines running into D.C., which put the city in a state of panic because they feared an immediate Southern invasion.
Within 6 months of the start of the war, the U.S. Military Telegraph Corps
The U.S. Military Telegraph Corps was formed in 1861 following the outbreak of the American Civil War. David Strouse, Samuel M. Brown, Richard O'Brian and David H. Bates, all from the Pennsylvania Railroad Company, were sent to Washington, D.C. t ...
(USMT) had laid approximately of line. By war's end they had laid approximately of line, 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
American(s) may refer to:
* American, something of, from, or related to the United States of America, commonly known as the "United States" or "America"
** Americans, citizens and nationals of the United States of America
** American ancestry, pe ...
censored suspect messages informally to block aid to the secession movement. During the war, Secretary of War
The secretary of war was a member of the U.S. president's Cabinet, beginning with George Washington's administration. A similar position, called either "Secretary at War" or "Secretary of War", had been appointed to serve the Congress of the ...
Simon Cameron
Simon Cameron (March 8, 1799June 26, 1889) was an American businessman and politician who represented Pennsylvania in the United States Senate and served as United States Secretary of War under President Abraham Lincoln at the start of the Americ ...
, and later Edwin Stanton
Edwin McMasters Stanton (December 19, 1814December 24, 1869) was an American lawyer and politician who served as U.S. Secretary of War under the Lincoln Administration during most of the American Civil War. Stanton's management helped organize t ...
, 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. Stanton himself said " elegraphyis my right arm". Telegraphy assisted Northern victories, including the Battle of Antietam
The Battle of Antietam (), or Battle of Sharpsburg particularly in the Southern United States, was a battle of the American Civil War fought on September 17, 1862, between Confederate Gen. Robert E. Lee's Army of Northern Virginia and Union G ...
(1862), the Battle of Chickamauga
The Battle of Chickamauga, fought on September 19–20, 1863, between United States, U.S. and Confederate States of America, Confederate forces in the American Civil War, marked the end of a Union Army, Union offensive, the Chickamauga Campaign ...
(1863), and Sherman's March to the Sea
Sherman's March to the Sea (also known as the Savannah campaign or simply Sherman's March) was a military campaign of the American Civil War conducted through Georgia from November 15 until December 21, 1864, by William Tecumseh Sherman, major ...
(1864).
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 did not have to follow military authority. Usually they performed without hesitation, but they were not required to, so Albert Myer created a U.S. Army Signal Corps
)
, colors = Orange and white
, colors_label = Corps colors
, march =
, mascot =
, equipment =
, equipment_label =
...
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
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
, Britain's telegraph communications were almost completely uninterrupted, while it was able to quickly cut Germany's cables worldwide. The British government censored telegraph cable companies in an effort to root out espionage and restrict financial transactions with Central Powers nations. British access to transatlantic cables and its codebreaking expertise led to the Zimmermann Telegram incident that contributed to the US joining the war. Despite British acquisition of German colonies and expansion into the Middle East, debt from the war led to Britain's control over telegraph cables to weaken while US control grew.
Second World War
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
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
Electra House is a building at 84 Moorgate, London, England. It is notable as the wartime London base of Cable & Wireless Limited, and office of Department EH — one of the three British organisations that merged in World War II to form the Spec ...
, Cable & Wireless's head office and central cable station, was damaged by German bombing in 1941.
Resistance movements
A resistance movement is an organized effort by some portion of the civil population of a country to withstand the legally established government or an occupying power and to disrupt civil order and stability. It may seek to achieve its objectives ...
in occupied Europe sabotaged communications facilities such as telegraph lines, forcing the Germans to use wireless telegraphy
Wireless telegraphy or radiotelegraphy is transmission of text messages by radio waves, analogous to electrical telegraphy using cables. Before about 1910, the term ''wireless telegraphy'' was also used for other experimental technologies for ...
, which could then be intercepted by Britain.
The Germans developed a highly complex teleprinter attachment (German: ''Schlüssel-Zusatz'', "cipher attachment") that was used for enciphering telegrams, using the Lorenz cipher
The Lorenz SZ40, SZ42a and SZ42b were German rotor stream cipher machines used by the German Army during World War II. They were developed by C. Lorenz AG in Berlin. The model name ''SZ'' was derived from ''Schlüssel-Zusatz'', meaning ''cipher ...
, 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
The Western Union Company is an American multinational financial services company, headquartered in Denver, Colorado.
Founded in 1851 as the New York and Mississippi Valley Printing Telegraph Company in Rochester, New York, the company chang ...
. Western Union was the leading telegraph provider for America and was seen as the best competition for the National Bell Telephone Company
The Bell Telephone Company, a common law joint stock company, was organized in Boston, Massachusetts, on July 9, 1877, by Alexander Graham Bell's father-in-law Gardiner Greene Hubbard, who also helped organize a sister company – the New Engl ...
. 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
AT&T Inc. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company by revenue and the third largest provider of mobile tel ...
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
The telex network is a station-to-station switched network of teleprinters similar to a Public switched telephone network, telephone network, using telegraph-grade connecting circuits for two-way text-based messages. Telex was a major method of ...
businesses in 1990.
Although commercial "telegraph" services are still available in many countries, transmission is usually done via a computer network
A computer network is a set of computers sharing resources located on or provided by network nodes. The computers use common communication protocols over digital interconnections to communicate with each other. These interconnections are ...
rather than a dedicated wired connection.
See also
* 92 Code
A wire signal is a brevity code used by telegraphers to save time and cost when sending long messages. The most well-known of these was the 92 Code adopted by Western Union in 1859. The reason for this adoption was to reduce bandwidth (signal proce ...
* Aurora (astronomy)
An aurora (plural: auroras or aurorae), also commonly known as the polar lights, is a natural light display in Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras display dynamic patterns of br ...
* American Telephone and Telegraph Company
AT&T Inc. is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company by revenue and the third largest provider of mobile tel ...
(AT&T)
* Bell Canada
Bell Canada (commonly referred to as Bell) is a Canadian telecommunications company headquartered at 1 Carrefour Alexander-Graham-Bell in the borough of Verdun in Montreal, Quebec, Canada. It is an ILEC (incumbent local exchange carrier) in t ...
* Geomagnetically induced current
Geomagnetically induced currents (GIC) are electrical currents induced at the Earth's surface by rapid changes in the geomagnetic field caused by space weather events. GICs can affect the normal operation of long electrical conductor systems such a ...
* Great Northern Telegraph Company
GN Store Nord A/S is a Danish manufacturer of hearing aids (GN ReSound/GN Hearing) and headsets ( Jabra (GN Audio)). GN Store Nord A/S is listed on NASDAQ OMX Copenhagen (ISIN code DK0010272632).
History The 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
The Western Electric Company was an American electrical engineering and manufacturing company officially founded in 1869. A wholly owned subsidiary of American Telephone & Telegraph for most of its lifespan, it served as the primary equipment ma ...
References
Bibliography
*
*Bowers, Brian, ''Sir Charles Wheatstone: 1802–1875'', IET, 2001
*
*
*
*
*
*
* Holzmann, Gerard J.; Pehrson, Björn, ''The Early History of Data Networks'', Wiley, 1995
*
* Attributed to
*
*
*Mercer, David, ''The Telephone: The Life Story of a Technology'', Greenwood Publishing Group, 2006
*
Further reading
* Cooke, W.F., ''The Electric Telegraph, Was it invented by Prof. Wheatstone?'', London 1856.
*
* Gauß, C. F., ''Works'', Göttingen 1863–1933.
* Howe, Daniel Walker, ''What Hath God Wrought: The Transformation of America, 1815–1848'', Oxford University Press, 2007 .
* 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.
* Yates, JoAnne
The Telegraph's Effect on Nineteenth Century Markets and Firms
Massachusetts Institute of Technology
The Massachusetts Institute of Technology (MIT) is a private land-grant research university in Cambridge, Massachusetts. Established in 1861, MIT has played a key role in the development of modern technology and science, and is one of the ...
, pp. 149–163.
External links
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.)
* https://web.archive.org/web/20050829153213/http://collections.ic.gc.ca/canso/index.htm
Shilling's telegraph
an exhibit of the A.S. Popov Central Museum of Communications
The A.S. Popov Central Museum of Communications is a museum of science and technology founded in 1872. It is located in the historic centre of Saint Petersburg, Russia, near Saint Isaac's Square.
History
The museum was opened on 11 September 18 ...
History of electromagnetic telegraph
article in ''PCWeek'', Russian edition.
Distant Writing
– The History of the Telegraph Companies in Britain between 1838 and 1868
NASA
The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research.
NASA was established in 1958, succeeding t ...
6 May 2008
How Cables Unite The World
– a 1902 article about telegraph networks and technology from the magazine ''The World's Work
''The World's Work'' (1900–1932) was a monthly magazine that covered national affairs from a pro-business point of view. It was produced by the publishing house Doubleday, Page and Company, which provided the first editor, Walter Hines Page. Th ...
''
*
Indiana telegraph and telephone collection
Rare Books and Manuscripts, Indiana State Library
*
Wonders of electricity and the elements, being a popular account of modern electrical and magnetic discoveries, magnetism and electric machines, the electric telegraph and the electric light, and the metal bases, salt, and acids
' fro
Science History Institute Digital Collections
*
The electro magnetic telegraph: with an historical account of its rise, progress, and present condition
' fro
Science History Institute Digital Collections
{{Authority control
Telegraphy
Russian inventions
19th-century inventions
Telegraph
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 p ...
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