96-476: The Australian Overland Telegraph Line was an electrical telegraph system for sending messages the 3200 kilometres (2000 miles) between Darwin , in what is now the Northern Territory of Australia, and Adelaide , the capital of South Australia . Completed in 1872 (with a line to Western Australia added in 1877), it allowed fast communication between Australia and the rest of the world. When it
192-506: A 175-yard (160 m) long trench as well as an eight-mile (13 km) long overhead telegraph. The lines were connected at both ends to revolving dials marked with the letters of the alphabet and electrical impulses sent along the wire were used to transmit messages. Offering his invention to the Admiralty in July 1816, it was rejected as "wholly unnecessary". His account of the scheme and
288-960: A central section which would be constructed by his own department. The telegraph line would comprise more than 30,000 wrought iron poles, insulators, batteries, wire and other equipment, ordered from England. The poles were placed 80 m apart and repeater stations separated by no more than 250 km, a major criterion being year-round availability of water. Todd appointed staff to whom the contractors would be responsible: Explorer, John Ross ; Surveyor, William Harvey ; Overseer of Works, Northern Territory, William McMinn ; Sub-Overseer, R. C. Burton ; Operators , James Lawrence Stapleton (murdered 1874 at Barrow Creek ) and Andrew Howley. Surveyors and Overseers, central portion of line: A. T. Woods , Gilbert McMinn , and Richard Randall Knuckey ; Overseer, James Beckwith; Sub-Overseers, J. F. Roberts (perhaps J. Le M. F. Roberts ), Stephen Jarvis, W. W. Mills , W. Charles Musgrave , and Christopher Giles . He assembled
384-480: 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
480-468: 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
576-504: A linesman. The job of a telegraphist was to record each message received, with the time of day, and to re-send (relay) it further along the line. Within the first year of operations 4000 telegrams were transmitted. Maintenance was an ongoing and mammoth task, with floods often destroying poles, and a range of other incidents disrupting the line. In the 1880s, wooden poles were replaced with Joseph Oppenheimer's patented telescoping poles . The line proved an immediate success in opening
672-698: A moving paper tape by a stylus which was operated by an electromagnet. Morse and Vail developed the Morse code signalling alphabet . On May 24, 1844, Morse sent to Vail the historic first message “ WHAT HATH GOD WROUGHT " from the Capitol in Washington to the old Mt. Clare Depot in Baltimore . The first commercial electrical telegraph was the Cooke and Wheatstone system . A demonstration four-needle system
768-576: A permanent magnet and connecting the coil with the transmission wires by means of the commutator. The page of Gauss's laboratory notebook containing both his code and the first message transmitted, as well as a replica of the telegraph made in the 1850s under the instructions of Weber are kept in the faculty of physics at the University of Göttingen , in Germany. Gauss was convinced that this communication would be of help to his kingdom's towns. Later in
864-426: 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
960-545: A sensitive indicator for an electric current. Also that year, André-Marie Ampère 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 200 feet (61 m) and declared it impractical. In 1830 William Ritchie improved on Ampère's design by placing
1056-621: A shepherd for George Macleay and in 1838 he joined Charles Bonney in the first cattle drive from the Goulburn River to Adelaide . In South Australia he successfully managed several large sheep properties and conducted exploration of the area. In 1869 he explored the Stevenson River to Eringa and Mount Humphries ; he named the mountains after his children, Sarah, Rebecca, Alexander and John. In 1870 his then employer Thomas Elder recommended Ross' service to Charles Todd ,
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#17327718608481152-601: A short-distance transmission of signals between two telegraphs in different rooms of his apartment. In 1836, the British government attempted to buy the design but Schilling instead accepted overtures from Nicholas I of Russia . Schilling's telegraph was tested on a 5-kilometre-long (3.1 mi) experimental underground and underwater cable, laid around the building of the main Admiralty in Saint Petersburg and
1248-405: 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 ) was typed onto a piece of perforated tape using a keyboard-like device called
1344-531: A team of men for his central section: surveyors, linesmen, carpenters, labourers and cooks. The team left Adelaide with horses, bullocks and carts loaded with provisions and equipment for many weeks. The central section would be surveyed by the explorer John Ross and Alfred Giles , his second-in-command. The southern section from Port Augusta to Alberga Creek was contracted to Edward Meade Bagot . He contracted Benjamin Herschel Babbage to survey
1440-467: A telegraph along the Nuremberg–Fürth railway line , built in 1835 as the first German railroad, which was the first earth-return telegraph put into service. By 1837, William Fothergill Cooke and Charles Wheatstone had co-developed a telegraph system which used a number of needles on a board that could be moved to point to letters of the alphabet. Any number of needles could be used, depending on
1536-477: A useful communication system. In 1774, Georges-Louis Le Sage realised an early electric telegraph. The telegraph had a separate wire for each of the 26 letters of the alphabet and its range was only between two rooms of his home. In 1800, Alessandro Volta invented the voltaic pile , providing a continuous current of electricity for experimentation. This became a source of a low-voltage current that could be used to produce more distinct effects, and which
1632-696: Is a point-to-point text messaging system, primarily used from the 1840s until the late 20th century. It was the first electrical telecommunications system and the most widely used of a number of early messaging systems called telegraphs , that were devised to send text messages more quickly than physically carrying them. Electrical telegraphy can be considered the first example of electrical engineering . Text telegraphy consisted of two or more geographically separated stations, called telegraph offices . The offices were connected by wires, usually supported overhead on utility poles . Many electrical telegraph systems were invented that operated in different ways, but
1728-493: The Northern Territory ; gold discoveries were made in several places along the northern section (in particular Pine Creek ), and the repeater stations in the MacDonnell Ranges proved invaluable starting points for explorers like Ernest Giles , W. C. Gosse , and Peter Egerton-Warburton who were heading west. In February 1875, a small contingent of Overland Telegraph employees left Port Darwin for Adelaide on
1824-511: The continent from Menindee to the Gulf of Carpentaria in 1860. Although the route was traversed, the expedition ended in disaster. The South Australian government recognised the economic benefits that would result from becoming the centre of the telegraph network. It offered a reward of £2000 to encourage an expedition to find a route between South Australia and the north coast. John McDouall Stuart had meanwhile also been endeavouring to cross
1920-470: The 'Stick Punch'. The transmitter automatically ran the tape through and transmitted the message at the then exceptionally high speed of 70 words per minute. An early successful teleprinter was invented by Frederick G. Creed . In Glasgow he created his first keyboard perforator, which used compressed air to punch the holes. He also created a reperforator (receiving perforator) and a printer. The reperforator punched incoming Morse signals onto paper tape and
2016-668: The ABC produced Constructing Australia , a three-part miniseries, which included the 55-minute "Wire through the Heart" on the Overland Telegraph Line. A 6-minute excerpt, "Todd Completes Telegraph" may be viewed on this project page from the NFSA . 25°55′37.77″S 134°58′25.58″E / 25.9271583°S 134.9737722°E / -25.9271583; 134.9737722 Electrical telegraph Electrical telegraphy
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#17327718608482112-700: The Darwin– Burketown route. The final contract was secured in 1870 when the South Australian government agreed to construct 3200 km of line to Darwin, while the British-Australian Telegraph Company promised to lay the undersea cable from Banyuwangi , Java to Darwin. The latter was to be finished on 31 December 1871, and severe penalties were to apply if the connecting link was not ready. The South Australian Superintendent of Telegraphs, Charles Todd ,
2208-579: The ITA-1 Baudot code , a five-bit code. This yielded only thirty-two codes, so it was over-defined into two "shifts", "letters" and "figures". An explicit, unshared shift code prefaced each set of letters and figures. In 1901, Baudot's code was modified by Donald Murray . In the 1930s, teleprinters were produced by Teletype in the US, Creed in Britain and Siemens in Germany. By 1935, message routing
2304-591: The Imperial palace at Tsarskoye Selo and Kronstadt Naval Base . In 1833, Carl Friedrich Gauss , together with the physics professor Wilhelm Weber in Göttingen , installed a 1,200-metre-long (3,900 ft) wire above the town's roofs. Gauss combined the Poggendorff-Schweigger multiplicator with his magnetometer to build a more sensitive device, the galvanometer . To change the direction of
2400-459: The Morse system became the standard for international communication, using a modified form of Morse's code that had been developed for German railways. Electrical telegraphs were used by the emerging railway companies to provide signals for train control systems, minimizing the chances of trains colliding with each other. This was built around the signalling block system in which signal boxes along
2496-519: The Morse system. As well as the rapid expansion of the use of the telegraphs along the railways, they soon spread into the field of mass communication with the instruments being installed in post offices . The era of mass personal communication had begun. Telegraph networks were expensive to build, but financing was readily available, especially from London bankers. By 1852, National systems were in operation in major countries: The New York and Mississippi Valley Printing Telegraph Company, for example,
2592-463: The SS Seine . The operation took only 10 days and was completed on 26 February 1889. These were all British companies. Cable Beach is named after this cable that connected Java to Cable Station, that served this purpose until March 1914. After operating for 25 years it closed due to the opening of more competitive, cheaper-to-run stations; most cables were subsequently recovered. Cable Station
2688-582: The alphabet, a message could be transmitted by connecting the wire terminals in turn to an electrostatic machine, and observing the deflection of pith balls at the far end. The writer has never been positively identified, but the letter was signed C.M. and posted from Renfrew leading to a Charles Marshall of Renfrew being suggested. Telegraphs employing electrostatic attraction were the basis of early experiments in electrical telegraphy in Europe, but were abandoned as being impractical and were never developed into
2784-546: The application of electricity to communications at a distance. All the known effects of electricity – such as sparks , electrostatic attraction , chemical changes , electric shocks , and later electromagnetism – were applied to the problems of detecting controlled transmissions of electricity at various distances. In 1753, an anonymous writer in the Scots Magazine suggested an electrostatic telegraph. Using one wire for each letter of
2880-553: 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 adopted
2976-420: The bar, creating a much more powerful electromagnet which could operate a telegraph through the high resistance of long telegraph wires. During his tenure at The Albany Academy from 1826 to 1832, Henry first demonstrated the theory of the 'magnetic telegraph' by ringing a bell through one-mile (1.6 km) of wire strung around the room in 1831. In 1835, Joseph Henry and Edward Davy independently invented
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3072-403: The bubbles and could then record the transmitted message. This is in contrast to later telegraphs that used a single wire (with ground return). Hans Christian Ørsted discovered in 1820 that an electric current produces a magnetic field that will deflect a compass needle. In the same year Johann Schweigger invented the galvanometer , with a coil of wire around a compass, that could be used as
3168-517: The cable from Singapore via Java to Port Darwin. In 1873, three British companies, The British India Extension Telegraph Company, The BAT and The China Submarine Telegraph Company were amalgamated to form the Eastern Extension, Australasia and China Telegraph Company (EET Co). The driving force behind the British cable companies was a Scottish born entrepreneur Sir John Pender , founder of Cable and Wireless . On 19 November 1871, Australia
3264-697: 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,
3360-776: The colony's superintendent of telegraphs and government astronomer. Todd employed Ross to lead exploration of the route for the Australian Overland Telegraph Line . Ross' party ventured across the MacDonnell Ranges , the Simpson Desert , the Phillipson and Giles creeks and the Fergusson Ranges ; they also arrived at the Todd River . In March 1871 he arrived at and gave an English name to Alice Springs , however he found out that
3456-447: 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. The Morse system uses a single wire between offices. At the sending station, an operator taps on a switch called a telegraph key , spelling out text messages in Morse code . Originally,
3552-575: The connection of Australia to the new telegraph cable in Java and thus Europe. Among the routes under consideration were either Ceylon to Albany in Western Australia , or Java to the north coast of Australia and then either onto east coast, or south through the centre of the continent to Adelaide. Competition between the colonies over the route was fierce. The Victorian government organised an expedition led by Burke and Wills to cross
3648-515: The continent starting from the northern Flinders Ranges , and was successful on his sixth attempt in 1862. Stuart had the proposed telegraph line in mind as he travelled across the country, noting the best places for river crossings, sources of timber for telegraph poles, and water supplies. On 24 July, his expedition finally reached the north coast at a place Stuart named Chambers Bay , after his early sponsor, James Chambers . South Australian Governor Richard MacDonnell gave his strong support to
3744-591: The east coast by 24 October 1861, bringing an end to the Pony Express . France was slow to adopt the electrical telegraph, because of the extensive optical telegraph system built during the Napoleonic era . There was also serious concern that an electrical telegraph could be quickly put out of action by enemy saboteurs, something that was much more difficult to do with optical telegraphs which had no exposed hardware between stations. The Foy-Breguet telegraph
3840-504: The electric current, he constructed a commutator of his own. As a result, he was able to make the distant needle move in the direction set by the commutator on the other end of the line. At first, Gauss and Weber used the telegraph to coordinate time, but soon they developed other signals 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
3936-605: The electric telegraph, visual systems were used, including beacons , smoke signals , flag semaphore , and optical telegraphs for visual signals to communicate over distances of land. An auditory predecessor was West African talking drums . In the 19th century, Yoruba drummers used talking drums to mimic human tonal language to communicate complex messages – usually regarding news of birth, ceremonies, and military conflict – over 4–5 mile distances. From early studies of electricity , electrical phenomena were known to travel with great speed, and many experimenters worked on
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4032-521: The first means of radiowave telecommunication, which he began in 1894. In the early 20th century, manual operation of telegraph machines was slowly replaced by teleprinter networks. Increasing use of the telephone pushed telegraphy into only a few specialist uses; its use by the general public dwindled to greetings for special occasions. The rise of the Internet and email in the 1990s largely made dedicated telegraphy networks obsolete. Prior to
4128-712: The ill-fated SS Gothenburg . A few days later, at least ten were among the hundred-odd who lost their lives after she encountered a severe storm, and was driven into the Great Barrier Reef and sank. The southern section of the line included repeater stations at Beltana , Strangways Springs and the Peake . Traces and remains of these repeater stations can still be seen today along the Oodnadatta Track in South Australia. The central section of
4224-453: The line communicate with neighbouring boxes by telegraphic sounding of single-stroke bells and three-position needle telegraph instruments. In the 1840s, the electrical telegraph superseded optical telegraph systems such as semaphores, becoming the standard way to send urgent messages. By the latter half of the century, most developed nations had commercial telegraph networks with local telegraph offices in most cities and towns, allowing
4320-592: The line from Java reaching Darwin on 18 November 1871 and being connected the following day. Because of the problems still facing the northern section, the Queensland Superintendent of Telegraphs called for the abandonment of the project, and for the line to connect to the terminal at Burketown , but Todd was adamant and pressed on. By the end of the year there was still over 300 km of line to erect. A storm system impacting South and Central Australia caused significant interruptions on
4416-528: The line in January 1872. By May 1872, the line was substantially in use with horse or camel carrying messages across the uncompleted section. During this time, Todd began visiting workers along the line to lift their spirits. The message he sent along the incomplete line on 22 May 1872, took 9 days to reach Adelaide. Running more than seven months behind schedule, the two lines were finally joined at Frew's Ponds on Thursday, 22 August 1872. Todd
4512-496: The line included repeater stations at Charlotte Waters and Alice Springs . Charlotte Waters was operational until the 1930s; today there is very little left at the site. The northern section of the line included repeater stations at Barrow Creek , Tennant Creek , Daly Waters , Powell Creek , Katherine , Yam Creek and finally a terminus point in Darwin . In Darwin, there was also considerable infrastructure to manage and maintain
4608-465: The line, and lightning strikes were not uncommon. These breaks were as nothing compared with the flooding event involving the Peake and Strangways Springs stations in 1895. On 20 January the telegraph line was washed away by the Warrina Creek, a few miles north of Strangways Springs, and full service was not restored until 24 January. Improvised communication included carrying paper copies of
4704-736: The line, and sites at Beltana, Strangways Springs and the Peake were identified as sites for repeater stations. Charlotte Waters , just north of the South Australian border in the Northern Territory, was surveyed in 1871 by Gilbert McMinn and Richard Knuckey and a repeater station built in 1872. Darwent & Dalwood , who won the contract for the northern section of 600 miles (970 km), arrived in Port Darwin aboard SS Omeo in September 1870 with 80 men, 80 draught horses, bullocks, equipment and stores. Stephen King Jr.
4800-491: 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 invented the electromagnet , with a single winding of uninsulated wire on a piece of varnished iron , which increased the magnetic force produced by electric current. Joseph Henry improved it in 1828 by placing several windings of insulated wire around
4896-477: The mercury dipping electrical relay , 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 in 1837 and
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#17327718608484992-522: The messages by rail between the Peake and Oodnadatta. The flood at the Peake was unprecedented, but Todd authorised replacing the 23 ft (7.0 m) steel poles with 30-footers, set in concrete and reinforced with struts. When Darwin was bombed in World War II the line was deliberately cut just before the attack. The line was replaced in the early 1970s by a chain of microwave radio relays through Mount Isa . In 2008, its engineering heritage
5088-432: The most widely used of its type was the Cooke and Wheatstone telegraph , invented in 1837. The second category are armature systems, in which the current activates a telegraph sounder that makes a click; communication on this type of system relies on sending clicks in coded rhythmic patterns. The archetype of this category was the Morse system and the code associated with it, both invented by Samuel Morse in 1838. In 1865,
5184-422: The number of characters it was required to code. In May 1837 they patented their system. The patent recommended five needles, which coded twenty of the alphabet's 26 letters. Samuel Morse independently developed and patented a recording electric telegraph in 1837. Morse's assistant Alfred Vail developed an instrument that was called the register for recording the received messages. It embossed dots and dashes on
5280-414: The ones that became widespread fit into two broad categories. First are the needle telegraphs, in which electric current sent down the telegraph line produces electromagnetic force to move a needle-shaped pointer into position over a printed list. Early needle telegraph models used multiple needles, thus requiring multiple wires to be installed between stations. The first commercial needle telegraph system and
5376-415: The pointer reached the position of the depressed key, it would stop and the magneto would be disconnected from the line. The communicator's pointer was geared to the magneto mechanism. The indicator's pointer was moved by a polarised electromagnet whose armature was coupled to it through an escapement . Thus the alternating line voltage moved the indicator's pointer on to the position of the depressed key on
5472-410: The pointers on the dials at both ends set to the start position. The transmitting operator would then press down the key corresponding to the letter to be transmitted. In the base of the communicator was a magneto actuated by a handle on the front. This would be turned to apply an alternating voltage to the line. Each half cycle of the current would advance the pointers at both ends by one position. When
5568-513: The possibilities of rapid global communication in Descriptions of an Electrical Telegraph and of some other Electrical Apparatus was the first published work on electric telegraphy and even described the risk of signal retardation due to induction. Elements of Ronalds' design were utilised in the subsequent commercialisation of the telegraph over 20 years later. The Schilling telegraph , invented by Baron Schilling von Canstatt in 1832,
5664-580: The printer decoded this tape to produce alphanumeric characters on plain paper. This was the origin of the Creed High Speed Automatic Printing System, which could run at an unprecedented 200 words per minute. His system was adopted by the Daily Mail for daily transmission of the newspaper contents. With the invention of the teletypewriter , telegraphic encoding became fully automated. Early teletypewriters used
5760-567: The project. In 1863 an Order in Council transferred the Northern Territory to South Australia, aiming to secure land for an international telegraph connection. Now with a potential route, South Australia strengthened her position for the telegraph line in 1865 when Parliament authorised the construction of a telegraph line between Adelaide and Port Augusta, 300 km to the north. This move provoked outrage in Queensland amongst advocates of
5856-497: The public to send messages (called telegrams ) addressed to any person in the country, for a fee. Beginning in 1850, submarine telegraph cables allowed for the first rapid communication between people on different continents. The telegraph's nearly-instant transmission of messages across continents – and between continents – had widespread social and economic impacts. The electric telegraph led to Guglielmo Marconi 's invention of wireless telegraphy ,
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#17327718608485952-480: The receiving end. The system was very stable and accurate and became accepted around the world. The next improvement was the Baudot code of 1874. French engineer Émile Baudot patented a printing telegraph in which the signals were translated automatically into typographic characters. Each character was assigned a five-bit code, mechanically interpreted from the state of five on/off switches. Operators had to maintain
6048-450: 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
6144-473: The same year, instead of a voltaic pile , Gauss used an induction pulse, enabling him to transmit seven letters a minute instead of two. The inventors and university did not have the funds to develop the telegraph on their own, but they received funding from Alexander von Humboldt . Carl August Steinheil in Munich was able to build a telegraph network within the city in 1835–1836. In 1838, Steinheil installed
6240-426: The sending rate. There were many experiments with moving pointers, and various electrical encodings. However, most systems were too complicated and unreliable. A successful expedient to reduce the cost per message was the development of telegraphese . The first system that 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
6336-409: The signal. The repeater stations contained two primary batteries : the line was powered by a (c. 120 V) bank of Meidinger cells — a variation of Daniell cell , "recharged" by replacing the electrolyte — as well as Leclanche cells for the local equipment. Although repeater stations have been run by a single telegraphist, usual staffing was four to six, including a station master, telegraphists and
6432-433: The two clicks. The message was then written out in long-hand. Royal Earl House developed and patented a letter-printing telegraph system in 1846 which employed an alphabetic keyboard for the transmitter and automatically printed the letters on paper at the receiver, and followed this up with a steam-powered version in 1852. Advocates of printing telegraphy said it would eliminate Morse operators' errors. The House machine
6528-495: The undersea cable/s to Europe. Numerous interruptions to service occurred in the early days. Tribal Aboriginals discovered that splendid fishing hooks could be fashioned from the galvanised iron wire conductors (same as #8 fencing wire), spearheads and other implements could be made from shards of insulator, and hatchets from iron baseplates attached to some of the poles, keeping the linemen busy. Atmospheric disturbance from solar flares induced interfering signals in some sections of
6624-416: 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
6720-414: The workers back to Adelaide, on the basis of insufficient progress (they had erected poles to a distance of 225 miles (362 km) and strung wire for 129 miles (208 km) to that date) and the insurrection of the men. This last, the workers claimed, was exaggerated; they only refused to work after they had been sacked. These actions were certainly within his powers, and spelled out in the contract, but he
6816-410: Was a five-needle, six-wire system, and had the major advantage of displaying the letter being sent so operators did not need to learn a code. The insulation failed on the underground cables between Paddington and West Drayton, and when the line was extended to Slough in 1843, the system was converted to a one-needle, two-wire configuration with uninsulated wires on poles. The cost of installing wires
6912-415: Was an early needle telegraph . 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 galvanometers with magnetic needles, suspended from silk threads . The two stations of Schilling's telegraph were connected by eight wires; six were connected with the galvanometers, one served for
7008-463: Was another six months before reinforcements led by engineer Robert C. Patterson arrived in Darwin. As the central and southern sections neared completion, Patterson decided to take a different strategy with the construction of the northern section. It was divided into four sub-sections with the majority of the men on the most northerly section. The undersea cable was finished earlier than expected, with
7104-431: Was appointed head of the project, and devised a timetable to complete the immense project on schedule. Todd had built South Australia's first telegraph line and extended it to Melbourne. The contract stipulated a total cost of no more than £128,000 and two years' construction time. He divided the route into three sections, each of 600 miles (970 km): northern and southern sections to be handled by private contractors, and
7200-435: Was approved for a telegraph between the imperial palace at Peterhof and the naval base at Kronstadt . However, the project was cancelled following Schilling's death in 1837. Schilling was also one of the first to put into practice the idea of the binary system of signal transmission. His work was taken over and developed by Moritz von Jacobi who invented telegraph equipment that was used by Tsar Alexander III to connect
7296-401: Was connected telegraphically with the rest of the world after a cable was laid by BAT from Banyuwangi (Banjoewangie), at the eastern end of Java, to Darwin. This coincided with the completion of the construction of the overland telegraph cable from Adelaide to Darwin. The first message sent directly from London to Adelaide occurred on 22 October 1872. A second submarine cable from Java to Darwin
7392-533: Was considerably modified from the original American Morse code , and was based on a code used on Hamburg railways ( Gerke , 1848). A common code was a necessary step to allow direct telegraph connection between countries. With different codes, additional operators were required to translate and retransmit the message. In 1865, a conference in Paris adopted Gerke's code as the International Morse code and
7488-658: Was created in 1852 in Rochester, New York and eventually became the Western Union Telegraph Company . 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 during the 1870s. A continuing goal in telegraphy was to reduce the cost per message by reducing hand-work, or increasing
7584-453: Was dismissed on his return to Adelaide in July 1871. Joseph Darwent had protested the original appointment of McMinn, who had submitted a losing tender, but was overruled. William T. Dalwood was eventually awarded compensation of £11,000. The South Australian Government was now forced to construct an extra 700 km of line, and threw every available resource into its completion, down to purchasing horses and hiring men from New South Wales. It
7680-523: 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
7776-669: Was far less limited than the momentary discharge of an electrostatic machine , which with Leyden jars were the only previously known human-made sources of electricity. Another very early experiment in electrical telegraphy was an "electrochemical telegraph" created by the German physician , anatomist and inventor Samuel Thomas von Sömmering in 1809, based on an earlier 1804 design by Spanish polymath and scientist Francisco Salva Campillo . Both their designs employed multiple wires (up to 35) to represent almost all Latin letters and numerals. Thus, messages could be conveyed electrically up to
7872-421: Was given the honour of sending the first message along the completed line: After the first messages had been exchanged over the new line, Todd was accompanied by surveyor Richard Randall Knuckey on the return journey from Central Mount Stuart to Adelaide. The requirements of nineteenth century telegraphy meant the Overland Telegraph Line required repeater stations, a maximum of 250-300 km apart, to boost
7968-484: 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 and calcium hypochlorite . The first working telegraph was built by the English inventor Francis Ronalds in 1816 and used static electricity. At the family home on Hammersmith Mall , he set up a complete subterranean system in
8064-522: Was henceforth the international standard. The US, however, continued to use American Morse code internally for some time, hence international messages required retransmission in both directions. In the United States, the Morse/Vail telegraph was quickly deployed in the two decades following the first demonstration in 1844. The overland telegraph connected the west coast of the continent to
8160-427: Was implemented in Germany during the 1930s as a network used to communicate within the government. At the rate of 45.45 (±0.5%) baud – considered speedy at the time – up to 25 telex channels could share a single long-distance telephone channel by using voice frequency telegraphy multiplexing , making telex the least expensive method of reliable long-distance communication. Automatic teleprinter exchange service
8256-539: Was installed on the Euston to Camden Town section of Robert Stephenson 's London and Birmingham Railway in 1837 for signalling rope-hauling of locomotives. It was rejected in favour of pneumatic whistles. Cooke and Wheatstone had their first commercial success with a system installed on the Great Western Railway over the 13 miles (21 km) from Paddington station to West Drayton in 1838. This
8352-542: Was introduced into Canada by CPR Telegraphs and CN Telegraph in July 1957 and in 1958, Western Union started to build a Telex network in the United States. John Ross (explorer) John Ross (17 May 1817 – 5 February 1903) was a Scottish Australian drover and explorer. Ross was born in Bridgend , Scotland . He emigrated to Australia in 1837, arriving in Sydney on 31 August 1837. He first gained employment as
8448-470: Was laid in 1880 to provide redunancy. The site in the intertidal zone where the cables come ashore in Darwin, where they are still visible during very low tides, was heritage listed in 2020. On 9 April 1889 a third undersea telegraph cable opened for business, running from Banyuwangi , Java to Cable Beach , Western Australia and continuing overland to Perth , to complement the two cables already laid in 1871 and 1880 from Banyuwangi to Darwin. This cable
8544-653: Was laid to increase security in communications by avoiding disruption from seismic activity that kept breaking the Banyuwangi to Darwin cables. The contract for the cables called for the manufacture of 970 nautical miles of cable containing a single galvanised copper core with 220 nautical miles being brass sheathed, laid by the Telegraph Construction and Maintenance Company for the Eastern Extension, Australasia and China Telegraph Company , by
8640-726: Was left empty, and in 1921 it was purchased and transformed into its current use as the Broome Court House , which was placed on the Western Australian State Register of Heritage Places in 2001 as it is the only station that is still standing in Australia. In the 1930s Cinesound Productions announced plans to make a movie about the Telegraph based on a script by Frank Clune . This emeged as Clune's 1955 book Overland Telegraph . In 2007,
8736-490: Was linked to the Java -to-Darwin submarine telegraph cable several months later, the communication time with Europe dropped from months to hours; Australia was no longer so isolated from the rest of the world. The line was one of the great engineering feats of 19th-century Australia and probably the most significant milestone in the history of telegraphy in Australia . By 1855 speculation had intensified about possible routes for
8832-805: Was recognised by the installation of markers provided by the Engineers Australia 's Engineering Heritage Recognition Program at a location in Darwin near the place where the cable reached the shore, the Alice Springs Telegraph Station and the General Post Office in Adelaide . In 1870 the British Australia Telegraph Company (BAT) was formed to link Australia directly to the British telegraphic cable system, by extending
8928-469: 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 for circuit switching , and then sent data by ITA2 . This "type A" Telex routing functionally automated message routing. The first wide-coverage Telex network
9024-564: Was their surveyor and explorer. The northern line was progressing well until the onset of the wet season in November ;1870. Heavy rain of up to 10 inches (250 mm) a day waterlogged the ground and made it impossible for work to progress. With conditions worsening, the men went on strike on 7 March 1871, rancid food and disease-spreading mosquitoes amongst their complaints. On 3 May 1871, Overseer of Works William McMinn cancelled Darwent & Dalwood's contract and sent all
9120-426: 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 in use at the end of the nineteenth century; some remained in service in the 1930s. The Electric Telegraph Company , the world's first public telegraphy company, was formed in 1845 by financier John Lewis Ricardo and Cooke. Wheatstone developed
9216-533: Was used on four main American telegraph lines by 1852. The speed of the House machine was announced as 2600 words an hour. David Edward Hughes invented the printing telegraph in 1855; it used a keyboard of 26 keys for the alphabet and a spinning type wheel that determined the letter being transmitted by the length of time that had elapsed since the previous transmission. The system allowed for automatic recording on
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