Invention of the telephone

The invention of the telephone was the culmination of work done by many individuals, and led to an array of lawsuits relating to the patent claims of several individuals and numerous companies. The first telephone was invented by Antonio Meucci, but Alexander Graham Bell is credited with the development of the first practical telephone.

Telefono di Meucci - Museo scienza tecnologia Milano 02148-02147 dia
Meucci's telephone.
Actor portraying Alexander Graham Bell in an AT&T promotional film (1926)
An actor portraying Alexander Graham Bell speaking into an early model telephone

Early development

The concept of the telephone dates back to the string telephone or lover's telephone that has been known for centuries, comprising two diaphragms connected by a taut string or wire. Sound waves are carried as mechanical vibrations along the string or wire from one diaphragm to the other. The classic example is the tin can telephone, a children's toy made by connecting the two ends of a string to the bottoms of two metal cans, paper cups or similar items. The essential idea of this toy was that a diaphragm can collect voice sounds from the air, as in the ear, and a string or wire can transmit such collected voice sounds for reproduction at a distance. One precursor to the development of the electromagnetic telephone originated in 1833 when Carl Friedrich Gauss and Wilhelm Eduard Weber invented an electromagnetic device for the transmission of telegraphic signals at the University of Göttingen, in Lower Saxony, helping to create the fundamental basis for the technology that was later used in similar telecommunication devices. Gauss's and Weber's invention is purported to be the world's first electromagnetic telegraph.[1]

Charles Grafton Page

In 1840, American Charles Grafton Page passed an electric current through a coil of wire placed between the poles of a horseshoe magnet. He observed that connecting and disconnecting the current caused a ringing sound in the magnet. He called this effect "galvanic music".[2]

Innocenzo Manzetti

Innocenzo Manzetti considered the idea of a telephone as early as 1844, and may have made one in 1864, as an enhancement to an automaton built by him in 1849.

Charles Bourseul

Charles Bourseul was a French telegraph engineer who proposed (but did not build) the first design of a "make-and-break" telephone in 1854. That is about the same time that Meucci later claimed to have created his first attempt at the telephone in Italy .

Bourseul explained: "Suppose that a man speaks near a movable disc sufficiently flexible to lose none of the vibrations of the voice; that this disc alternately makes and breaks the currents from a battery: you may have at a distance another disc which will simultaneously execute the same vibrations.... It is certain that, in a more or less distant future, a speech will be transmitted by electricity. I have made experiments in this direction; they are delicate and demand time and patience, but the approximations obtained promise a favorable result."

Johann Philipp Reis

DBP 1984 1198 Philipp Reis
A stamp dedicated to Johann Philipp Reis

The Reis telephone was developed from 1857 on. Allegedly, the transmitter was difficult to operate, since the relative position of the needle and the contact were critical to the device's operation. Thus, it can be called a "telephone", since it did transmit voice sounds electrically over distance, but was hardly a commercially practical telephone in the modern sense.

Thomas Edison tested the Reis equipment and found that "single words, uttered as in reading, speaking and the like, were perceptible indistinctly, notwithstanding here also the inflections of the voice, the modulations of interrogation, wonder, command, etc., attained distinct expression."[3]

In 1947, the Reis device was tested by the British company Standard Telephones and Cables (STC). The results also confirmed it could transmit and receive speech with good quality (fidelity), but relatively low intensity. At the time STC was bidding for a contract with Alexander Graham Bell's American Telephone and Telegraph Company, and the results were covered up by STC's chairman Sir Frank Gill to maintain Bell's reputation.

Antonio Meucci

An early voice communicating device was invented around 1854 by Antonio Meucci, who called it a telettrofono. In 1871 Meucci filed a caveat at the US Patent Office. His caveat describes his invention, but does not mention a diaphragm, electromagnet, conversion of sound into electrical waves, conversion of electrical waves into sound, or other essential features of an electromagnetic telephone.

Antonio Meucci
Antonio Meucci, c.1880

The first American demonstration of Meucci's invention took place in Staten Island, New York in 1854. In 1861, a description of it was reportedly published in an Italian-language New York newspaper, although no known copy of that newspaper issue or article has survived to the present day. Meucci claimed to have invented a paired electromagnetic transmitter and receiver, where the motion of a diaphragm modulated a signal in a coil by moving an electromagnet, although this was not mentioned in his 1871 U.S. patent caveat. A further discrepancy observed was that the device described in the 1871 caveat employed only a single conduction wire, with the telephone's transmitter-receivers being insulated from a 'ground return' path.

In the 1880s Meucci was credited with the early invention of inductive loading of telephone wires to increase long-distance signals. Unfortunately, serious burns from an accident, a lack of English, and poor business abilities resulted in Meucci's failing to develop his inventions commercially in America. Meucci demonstrated some sort of instrument in 1849 in Havana, Cuba, however, this may have been a variant of a string telephone that used wire. Meucci has been further credited with the invention of an anti-sidetone circuit. However, examination showed that his solution to sidetone was to maintain two separate telephone circuits and thus use twice as many transmission wires. The anti-sidetone circuit later introduced by Bell Telephone instead canceled sidetone through a feedback process.

An American District Telegraph (ADT) laboratory reportedly lost some of Meucci's working models, his wife reportedly disposed of others and Meucci, who sometimes lived on public assistance, chose not to renew his 1871 teletrofono patent caveat after 1874.

A resolution was passed by the United States House of Representatives in 2002 that said Meucci did pioneering work on the development of the telephone.[4][5][6][7] The resolution said that "if Meucci had been able to pay the $10 fee to maintain the caveat after 1874, no patent could have been issued to Bell."

The Meucci resolution by the US Congress was promptly followed by a Canada legislative motion by Canada's 37th Parliament, declaring Alexander Graham Bell as the inventor of the telephone. Others in Canada disagreed with the Congressional resolution, some of whom provided criticisms of both its accuracy and intent.

Chronology of Meucci's invention

A retired director general of the Telecom Italia central telecommunications research institute (CSELT), Basilio Catania,[8] and the Italian Society of Electrotechnics, "Federazione Italiana di Elettrotecnica", have devoted a Museum to Antonio Meucci, constructing a chronology of his invention of the telephone and tracing the history of the two legal trials involving Meucci and Alexander Graham Bell.[9][10][11]

They claim that Meucci was the actual inventor of the telephone, and base their argument on reconstructed evidence. What follows, if not otherwise stated, is a résumé of their historic reconstruction.[12]

  • In 1834 Meucci constructed a kind of acoustic telephone as a way to communicate between the stage and control room at the theatre "Teatro della Pergola" in Florence. This telephone is constructed on the model of pipe-telephones on ships and is still working.[13]
  • In 1848 Meucci developed a popular method of using electric shocks to treat rheumatism. He used to give his patients two conductors linked to 60 Bunsen batteries and ending with a cork. He also kept two conductors linked to the same Bunsen batteries. He used to sit in his laboratory, while the Bunsen batteries were placed in a second room and his patients in a third room. In 1849 while providing a treatment to a patient with a 114V electrical discharge, in his laboratory Meucci heard his patient's scream through the piece of copper wire that was between them, from the conductors he was keeping near his ear. His intuition was that the "tongue" of copper wire was vibrating just like a leaf of an electroscope; which means that there was an electrostatic effect. In order to continue the experiment without hurting his patient, Meucci covered the copper wire with a piece of paper. Through this device he heard inarticulated human voice. He called this device "telegrafo parlante" (litt. "talking telegraph").[14]
  • On the basis of this prototype, Meucci worked on more than 30 kinds of sound transmitting devices inspired by the telegraph model as did other pioneers of the telephone, such as Charles Bourseul, Philipp Reis, Innocenzo Manzetti and others. Meucci later claimed that he did not think about transmitting voice by using the principle of the telegraph "make-and-break" method, but he looked for a "continuous" solution that did not interrupt the electric current.
  • Meucci later claimed that he constructed the first electromagnetic telephone, made of an electromagnet with a nucleus in the shape of a horseshoe bat, a diaphragm of animal skin, stiffened with potassium dichromate and keeping a metal disk stuck in the middle. The instrument was hosted in a cylindrical carton box.[15] He said he constructed this as a way to connect his second-floor bedroom to his basement laboratory, and thus communicate with his wife who was an invalid.
  • Meucci separated the two directions of transmission in order to eliminate the so-called "local effect", adopting what we would call today a 4-wire-circuit. He constructed a simple calling system with a telegraphic manipulator which short-circuited the instrument of the calling person, producing in the instrument of the called person a succession of impulses (clicks), much more intense than those of normal conversation. As he was aware that his device required a bigger band than a telegraph, he found some means to avoid the so-called "skin effect" through superficial treatment of the conductor or by acting on the material (copper instead of iron). He successfully used an insulated copper plait, thus anticipating the litz wire used by Nikola Tesla in RF coils.
  • In 1864 Meucci later claimed that he realized his "best device", using an iron diaphragm with optimized thickness and tightly clamped along its rim. The instrument was housed in a shaving-soap box, whose cover clamped the diaphragm.
  • In August 1870, Meucci later claimed that he obtained transmission of articulate human voice at a mile distance by using as a conductor a copper plait insulated by cotton. He called his device "teletrofono". Drawings and notes by Antonio Meucci dated September 27, 1870, show coils of wire on long-distance telephone lines.[16] The painting made by Nestore Corradi it:Nestore Corradi in 1858 mentions the sentence "Electric current from the inductor pipe"

The above information was published in the Scientific American Supplement No. 520 of December 19, 1876,[17] based on reconstructions produced in 1885, for which there was no contemporary pre-1875 evidence. Meucci's 1871 caveat did not mention any of the telephone features later credited to him by his lawyer, and which were published in that Scientific American Supplement, a major reason for the loss of the 'Bell v. Globe and Meucci' patent infringement court case, which was decided against Globe and Meucci.[18] See Antonio Meucci – Patent caveat, for the full printed text of his 1871 teletrofono patent caveat.

Cyrille Duquet

Cyrille Duquet invents the handset.[19]

Duquet obtained a patent on 1 Feb. 1878 for a number of modifications “giving more facility for the transmission of sound and adding to its acoustic properties,” and in particular for the design of a new apparatus combining the speaker and receiver in a single unit. [19]

Electro-magnetic transmitters and receivers

Elisha Gray

Elisha Gray, of Highland Park, Illinois (near Chicago) also devised a tone telegraph of this kind about the same time as La Cour. In Gray's tone telegraph, several vibrating steel reeds tuned to different frequencies interrupted the current, which at the other end of the line passed through electromagnets and vibrated matching tuned steel reeds near the electromagnet poles. Gray's 'harmonic telegraph,' with vibrating reeds, was used by the Western Union Telegraph Company. Since more than one set of vibration frequencies – that is to say, more than one musical tone – can be sent over the same wire simultaneously, the harmonic telegraph can be utilized as a 'multiplex' or many-ply telegraph, conveying several messages through the same wire at the same time. Each message can either be read by an operator by the sound, or from different tones read by different operators, or a permanent record can be made by the marks drawn on a ribbon of traveling paper by a Morse recorder. On July 27, 1875, Gray was granted U.S. patent 166,096 for "Electric Telegraph for Transmitting Musical Tones" (the harmonic)

On February 14, 1876, at the US Patent Office, Gray's lawyer filed a patent caveat for a telephone on the very same day that Bell's lawyer filed Bell's patent application for a telephone. The water transmitter described in Gray's caveat was strikingly similar to the experimental telephone transmitter tested by Bell on March 10, 1876, a fact which raised questions about whether Bell (who knew of Gray) was inspired by Gray's design or vice versa. Although Bell did not use Gray's water transmitter in later telephones, evidence suggests that Bell's lawyers may have obtained an unfair advantage over Gray.[20]

Alexander Graham Bell

AGBell Notebook
Bell's March 10, 1876, laboratory notebook entry describing his first successful experiment with the telephone

Alexander Graham Bell had pioneered a system called visible speech, developed by his father, to teach deaf children. In 1872 Bell founded a school in Boston to train teachers of the deaf. The school subsequently became part of Boston University, where Bell was appointed professor of vocal physiology in 1873. He became a naturalised U.S. citizen in 1882. Bell had long been fascinated by the idea of transmitting speech, and by 1875 had come up with a simple receiver that could turn electricity into sound. Others were working along the same lines, including an Italian-American Antonio Meucci, and debate continues as to who should be credited with inventing the telephone. However, Bell was granted a patent for the telephone on 7 March 1876 and it developed quickly. Within a year the first telephone exchange was built in Connecticut and the Bell Telephone Company was created in 1877, with Bell the owner of a third of the shares, quickly making him a wealthy man. In 1880, Bell was awarded the French Volta Prize for his invention and with the money, founded the Volta Laboratory in Washington, where he continued experiments in communication, in medical research, and in techniques for teaching speech to the deaf, working with Helen Keller among others. In 1885 he acquired land in Nova Scotia and established a summer home there where he continued experiments, particularly in the field of aviation. In 1888, Bell was one of the founding members of the National Geographic Society, and served as its president from 1896 to 1904, also helping to establish its journal. Bell died on 2 August 1922 at his home in Nova Scotia.

Alexander Graham Bell is the inventor of the first practical telephone. The classic story of him saying "Watson, come here! I want to see you!" is a well-known part of the history of the telephone. This showed that the telephone worked, but it was a short-range phone.[21][22] Bell was the first to obtain a patent, in 1876, for an "apparatus for transmitting vocal or other sounds telegraphically", after experimenting with many primitive sound transmitters and receivers. Bell was also an astute and articulate businessman with influential and wealthy friends.

As Professor of Vocal Physiology at Boston University, Bell was engaged in training teachers in the art of instructing the deaf how to speak and experimented with the Leon Scott phonautograph in recording the vibrations of speech. This apparatus consists essentially of a thin membrane vibrated by the voice and carrying a light-weight stylus, which traces an undulatory line on a plate of smoked glass. The line is a graphic representation of the vibrations of the membrane and the waves of sound in the air.[23]

This background prepared Bell for work with spoken sound waves and electricity. He began his experiments in 1873-1874 with a harmonic telegraph, following the examples of Bourseul, Reis, and Gray. Bell's designs employed various on-off-on-off make-break current-interrupters driven by vibrating steel reeds which sent interrupted current to a distant receiver electro-magnet that caused a second steel reed or tuning fork to vibrate.[24]

During a June 2, 1875, experiment by Bell and his assistant Thomas Watson, a receiver reed failed to respond to the intermittent current supplied by an electric battery. Bell told Watson, who was at the other end of the line, to pluck the reed, thinking it had stuck to the pole of the magnet. Watson complied, and to his astonishment Bell heard a reed at his end of the line vibrate and emit the same timbre of a plucked reed, although there were no interrupted on-off-on-off currents from a transmitter to make it vibrate.[25] A few more experiments soon showed that his receiver reed had been set in vibration by the magneto-electric currents induced in the line by the motion of the distant receiver reed in the neighborhood of its magnet. The battery current was not causing the vibration but was needed only to supply the magnetic field in which the reeds vibrated. Moreover, when Bell heard the rich overtones of the plucked reed, it occurred to him that since the circuit was never broken, all the complex vibrations of speech might be converted into undulating (modulated) currents, which in turn would reproduce the complex timbre, amplitude, and frequencies of speech at a distance.

After Bell and Watson discovered on June 2, 1875, that movements of the reed alone in a magnetic field could reproduce the frequencies and timbre of spoken sound waves, Bell reasoned by analogy with the mechanical phonautograph that a skin diaphragm would reproduce sounds like the human ear when connected to a steel or iron reed or hinged armature. On July 1, 1875, he instructed Watson to build a receiver consisting of a stretched diaphragm or drum of goldbeater's skin with an armature of magnetized iron attached to its middle, and free to vibrate in front of the pole of an electromagnet in circuit with the line. A second membrane-device was built for use as a transmitter.[26] This was the "gallows" phone. A few days later they were tried together, one at each end of the line, which ran from a room in the inventor's house, located at 5 Exeter Place in Boston, to the cellar underneath.[27] Bell, in the work room, held one instrument in his hands, while Watson in the cellar listened at the other. Bell spoke into his instrument, "Do you understand what I say?" and Watson answered "Yes". However, the voice sounds were not distinct and the armature tended to stick to the electromagnet pole and tear the membrane.

Bell himself claimed that the telephone was invented in Canada but made in the United States.[28]

Because of illness and other commitments, Bell made little or no telephone improvements or experiments for eight months until after his U.S. patent 174,465 was published.[26]

Bell's success

Alexander Graham Bell's telephone patent[29] drawing, March 7, 1876
Telephone Centennial Issue 1976-13c
Bell's Prototype Telephone Centennial Issue of 1976

The first successful bi-directional transmission of clear speech by Bell and Watson was made on March 10, 1876, when Bell spoke into the device, "Mr. Watson, come here, I want to see you." and Watson answered. Bell tested Gray's liquid transmitter design[30] in this experiment, but only after Bell's patent was granted and only as a proof of concept scientific experiment[31] to prove to his own satisfaction that intelligible "articulate speech" (Bell's words) could be electrically transmitted.[32] Because a liquid transmitter was not practical for commercial products, Bell focused on improving the electromagnetic telephone after March 1876 and never used Gray's liquid transmitter in public demonstrations or commercial use.[33]

Bell's telephone transmitter (microphone) consisted of a double electromagnet, in front of which a membrane, stretched on a ring, carried an oblong piece of soft iron cemented to its middle. A funnel-shaped mouthpiece directed the voice sounds upon the membrane, and as it vibrated, the soft iron "armature" induced corresponding currents in the coils of the electromagnet. These currents, after traversing the wire, passed through the receiver which consisted of an electromagnet in a tubular metal can having one end partially closed by a thin circular disc of soft iron. When the undulatory current passed through the coil of this electromagnet, the disc vibrated, thereby creating sound waves in the air.

This primitive telephone was rapidly improved. The double electromagnet was replaced by a single permanently magnetized bar magnet having a small coil or bobbin of fine wire surrounding one pole, in front of which a thin disc of iron was fixed in a circular mouthpiece. The disc served as a combined diaphragm and armature. On speaking into the mouthpiece, the iron diaphragm vibrated with the voice in the magnetic field of the bar-magnet pole, and thereby caused undulatory currents in the coil. These currents, after traveling through the wire to the distant receiver, were received in an identical apparatus. This design was patented by Bell on January 30, 1877. The sounds were weak and could only be heard when the ear was close to the earphone/mouthpiece, but they were distinct.

The first long distance telephone call was made on August 10, 1876, by Bell from the family homestead in Brantford, Ontario, to his assistant located in Paris, Ontario, some 10 miles (16 km) apart.

Public demonstrations

Bell exhibited a working telephone at the Centennial Exhibition in Philadelphia in June 1876, where it attracted the attention of Brazilian emperor Pedro II plus the physicist and engineer Sir William Thomson (who would later be ennobled as the 1st Baron Kelvin). In August 1876 at a meeting of the British Association for the Advancement of Science, Thomson revealed the telephone to the European public. In describing his visit to the Philadelphia Exhibition, Thomson said, "I heard [through the telephone] passages taken at random from the New York newspapers: 'S.S. Cox Has Arrived' (I failed to make out the S.S. Cox); 'The City of New York', 'Senator Morton', 'The Senate Has Resolved To Print A Thousand Extra Copies', 'The Americans In London Have Resolved To Celebrate The Coming Fourth Of July!' All this my own ears heard spoken to me with unmistakable distinctness by the then circular disc armature of just such another little electro-magnet as this I hold in my hand."

Only a few months after receiving U.S. Patent No. 174465 at the beginning of March 1876, Bell conducted three important tests of his new invention and the telephone technology after returning to his parents' home at Melville House (now the Bell Homestead National Historic Site) for the summer.

In the first test call on August 3, 1876, Alexander Graham's uncle, Professor David Charles Bell, spoke to him from the Brantford telegraph office, reciting lines from Shakespeare's Hamlet ("To be or not to be....").[34][35] The young inventor, positioned at the A. Wallis Ellis store in the neighboring community of Mount Pleasant,[34][36] received and may possibly have transferred his uncle's voice onto a phonautogram, a drawing made on a pen-like recording device that could produce the shapes of sound waves as waveforms onto smoked glass or other media by tracing their vibrations.

The next day on August 4 another call was made between Brantford's telegraph office and Melville House, where a large dinner party exchanged "....speech, recitations, songs and instrumental music".[34] To bring telephone signals to Melville House, Alexander Graham audaciously "bought up" and "cleaned up" the complete supply of stovepipe wire in Brantford.[37][38] With the help of two of his parents' neighbours,[39] he tacked the stovepipe wire some 400 metres (a quarter mile) along the top of fence posts from his parents' home to a junction point on the telegraph line to the neighbouring community of Mount Pleasant, which joined it to the Dominion Telegraph office in Brantford, Ontario.[40][41]

The third and most important test was the world's first true long-distance telephone call, placed between Brantford and Paris, Ontario on August 10, 1876.[42][43] For that long-distance call Alexander Graham Bell set up a telephone using telegraph lines at Robert White's Boot and Shoe Store at 90 Grand River Street North in Paris via its Dominion Telegraph Co. office on Colborne Street. The normal telegraph line between Paris and Brantford was not quite 13 km (8 miles) long, but the connection was extended a further 93 km (58 miles) to Toronto to allow the use of a battery in its telegraph office.[34][44]

Scientific American described the three test calls in their September 9, 1876, article, "The Human Voice Transmitted by Telegraph".[44] Historian Thomas Costain referred to the calls as "the three great tests of the telephone".[45] One Bell Homestead reviewer wrote of them, "No one involved in these early calls could possibly have understood the future impact of these communication firsts".[46]

A later telephone design was publicly exhibited on May 4, 1877, at a lecture given by Professor Bell in the Boston Music Hall. According to a report quoted by John Munro in Heroes of the Telegraph:

Going to the small telephone box with its slender wire attachments, Mr. Bell coolly asked, as though addressing someone in an adjoining room, "Mr. Watson, are you ready!" Mr. Watson, five miles away in Somerville, promptly answered in the affirmative, and soon was heard a voice singing "America". [...] Going to another instrument, connected by wire with Providence, forty-three miles distant, Mr. Bell listened a moment, and said, "Signor Brignolli, who is assisting at a concert in Providence Music Hall, will now sing for us." In a moment the cadence of the tenor's voice rose and fell, the sound being faint, sometimes lost, and then again audible. Later, a cornet solo played in Somerville was very distinctly heard. Still later, a three-part song came over the wire from Somerville, and Mr. Bell told his audience "I will switch off the song from one part of the room to another so that all can hear." At a subsequent lecture in Salem, Massachusetts, communication was established with Boston, eighteen miles distant, and Mr. Watson at the latter place sang "Auld Lang Syne", the National Anthem, and "Hail Columbia", while the audience at Salem joined in the chorus.[47]

Summary of Bell's achievements

Bell did for the telephone what Henry Ford did for the automobile. Although not the first to experiment with telephonic devices, Bell and the companies founded in his name were the first to develop commercially practical telephones around which a successful business could be built and grow. Bell adopted carbon transmitters similar to Edison's transmitters and adapted telephone exchanges and switching plug boards developed for telegraphy. Watson and other Bell engineers invented numerous other improvements to telephony. Bell succeeded where others failed to assemble a commercially viable telephone system. It can be argued that Bell invented the telephone industry. Bell's first intelligible voice transmission over an electric wire was named an IEEE Milestone.[48]

Variable resistance transmitters

Water microphone – Elisha Gray

Elisha Gray recognized the lack of fidelity of the make-break transmitter of Reis and Bourseul and reasoned by analogy with the lover's telegraph, that if the current could be made to more closely model the movements of the diaphragm, rather than simply opening and closing the circuit, greater fidelity might be achieved. Gray filed a patent caveat with the US patent office on February 14, 1876, for a liquid microphone. The device used a metal needle or rod that was placed – just barely – into a liquid conductor, such as a water/acid mixture. In response to the diaphragm's vibrations, the needle dipped more or less into the liquid, varying the electrical resistance and thus the current passing through the device and on to the receiver. Gray did not convert his caveat into a patent application until after the caveat had expired and hence left the field open to Bell.

When Gray applied for a patent for the variable resistance telephone transmitter, the Patent Office determined "while Gray was undoubtedly the first to conceive of and disclose the (variable resistance) invention, as in his caveat of 14 February 1876, his failure to take any action amounting to completion until others had demonstrated the utility of the invention deprives him of the right to have it considered."[49]

Carbon microphone – Thomas Edison, Edward Hughes, Emile Berliner

The carbon microphone was independently developed around 1878 by David Edward Hughes in England and Emile Berliner and Thomas Edison in the US. Although Edison was awarded the first patent in mid-1877, Hughes had demonstrated his working device in front of many witnesses some years earlier, and most historians credit him with its invention.

Thomas Alva Edison took the next step in improving the telephone with his invention in 1878 of the carbon grain "transmitter" (microphone) that provided a strong voice signal on the transmitting circuit that made long-distance calls practical. Edison discovered that carbon grains, squeezed between two metal plates, had a variable electrical resistance that was related to the pressure. Thus, the grains could vary their resistance as the plates moved in response to sound waves, and reproduce sound with good fidelity, without the weak signals associated with electromagnetic transmitters.

The carbon microphone was further improved by Emile Berliner, Francis Blake, David E. Hughes, Henry Hunnings, and Anthony White. The carbon microphone remained standard in telephony until the 1980s, and is still being produced.

Improvements to the early telephone

Additional inventions such as the call bell, central telephone exchange, common battery, ring tone, amplification, trunk lines, and wireless phones – at first cordless and then fully mobile – made the telephone the useful and widespread apparatus it is now.

Telephone exchanges

The telephone exchange was an idea of the Hungarian engineer Tivadar Puskás (1844–1893) in 1876, while he was working for Thomas Edison on a telegraph exchange.[50][51][52][53] Puskás was working on his idea for an electrical telegraph exchange when Alexander Graham Bell received the first patent for the telephone. This caused Puskás to take a fresh look at his own work and he refocused on perfecting a design for a telephone exchange. He then got in touch with the U.S. inventor Thomas Edison who liked the design. According to Edison, "Tivadar Puskas was the first person to suggest the idea of a telephone exchange".[54]


Bell has been widely recognized as the "inventor" of the telephone outside of Italy, where Meucci was championed as its inventor. In the United States, there are numerous reflections of Bell as a North American icon for inventing the telephone, and the matter was for a long time non-controversial. In June 2002, however, the United States House of Representatives passed a symbolic bill recognizing the contributions of Antonio Meucci "in the invention of the telephone" (not "for the invention of the telephone"), throwing the matter into some controversy. Ten days later the Canadian parliament countered with a symbolic motion conferring official recognition for the invention of the telephone to Bell.

Champions of Meucci, Manzetti, and Gray have each offered fairly precise tales of a contrivance whereby Bell actively stole the invention of the telephone from their specific inventor. In the 2002 congressional resolution, it was inaccurately noted that Bell worked in a laboratory in which Meucci's materials had been stored, and claimed that Bell must thus have had access to those materials. Manzetti claimed that Bell visited him and examined his device in 1865. And it is alleged that Bell bribed a patent examiner, Zenas Wilber, not only into processing his application before Gray's, but allowing a look at his rival's designs before final submission.

One of the valuable claims in Bell's 1876 U.S. Patent 174,465 was claim 4, a method of producing variable electric current in a circuit by varying the resistance in the circuit. That feature was not shown in any of Bell's patent drawings, but was shown in Elisha Gray's drawings in his caveat filed the same day, February 14, 1876. A description of the variable resistance feature, consisting of seven sentences, was inserted into Bell's application. That it was inserted is not disputed. But when it was inserted is a controversial issue. Bell testified that he wrote the sentences containing the variable resistance feature before January 18, 1876, "almost at the last moment" before sending his draft application to his lawyers. A book by Evenson[55] argues that the seven sentences and claim 4 were inserted, without Bell's knowledge, just before Bell's application was hand carried to the Patent Office by one of Bell's lawyers on February 14, 1876.

Contrary to the popular story, Gray's caveat was taken to the US Patent Office a few hours before Bell's application. Gray's caveat was taken to the Patent Office in the morning of February 14, 1876, shortly after the Patent Office opened and remained near the bottom of the in-basket until that afternoon. Bell's application was filed shortly before noon on February 14 by Bell's lawyer who requested that the filing fee be entered immediately onto the cash receipts blotter and Bell's application was taken to the Examiner immediately. Late in the afternoon, Gray's caveat was entered on the cash blotter and was not taken to the Examiner until the following day. The fact that Bell's filing fee was recorded earlier than Gray's led to the myth that Bell had arrived at the Patent Office earlier.[56] Bell was in Boston on February 14 and did not know this happened until later. Gray later abandoned his caveat and did not contest Bell's priority. That opened the door to Bell being granted US patent 174465 for the telephone on March 7, 1876.

Memorial to the invention

In 1906 the citizens of the City of Brantford, Ontario, Canada and its surrounding area formed the Bell Memorial Association to commemorate the invention of the telephone by Alexander Graham Bell in July 1874 at his parents’ home, Melville House, near Brantford.[57][58] Walter Allward's design was the unanimous choice from among 10 submitted models, winning the competition. The memorial was originally to be completed by 1912 but Allward did not finish it until five years later. The Governor General of Canada, Victor Cavendish, 9th Duke of Devonshire, ceremoniously unveiled the memorial on October 24, 1917.[57][58]

Allward designed the monument to symbolize the telephone's ability to overcome distances.[58] A series of steps lead to the main section where the floating allegorical figure of Inspiration appears over a reclining male figure representing Man, discovering his power to transmit sound through space, and also pointing to three floating figures, the messengers of Knowledge, Joy, and Sorrow positioned at the other end of the tableau. Additionally, there are two female figures mounted on granite pedestals representing Humanity positioned to the left and right of the memorial, one sending and the other receiving a message.[57]

The Bell Telephone Memorial's grandeur has been described as the finest example of Allward's early work, propelling the sculptor to fame. The memorial itself has been used as a central fixture for many civic events and remains an important part of Brantford's history, helping the city style itself as 'The Telephone City'.

Alexander Graham Bell Brantford Monument 0.98
The Bell Telephone Memorial, commemorating the invention of the telephone by Alexander Graham Bell. The monument, paid by public subscription and sculpted by W.S. Allward, was dedicated by the Governor General of Canada, Victor Cavendish, 9th Duke of Devonshire with Dr. Bell in The Telephone City's Alexander Graham Bell Gardens in 1917. Included on the main tableau are figures representing Man, discovering his power to transmit sound through space, Inspiration whispering to Man, his power to transmit sound through space, as well as Knowledge, Joy, Sorrow. (Courtesy: Brantford Heritage Inventory, City of Brantford, Ontario, Canada)

See also


  1. ^ Erster elektromagnetischer Telegraph der Welt über den Dächern von Göttingen (First electromagnetic telegraph in the world over the roofs of Göttingen), Georg-August-Universität Göttingen website. Retrieved January 22, 2013. (in German)
  2. ^ [1]
  3. ^ Coe, page 23
  4. ^ House Resolution 269
  5. ^ Wheen, Andrew. Dot-Dash to How Modern Telecommunications Evolved from the Telegraph to the Internet. Springer, 2010. p. 45. Web. 23 Sep. 2011.
  6. ^ Cleveland, Cutler (Lead Author) ; Saundry, Peter (Topic Editor). Meucci, Antonio. Encyclopedia of Earth, 2006. Web. 22 Jul. 2012.
  7. ^ (in Italian) Caretto, Ennio. Gli Usa ammettono: Meucci è l' inventore del telefono. Corriere della Sera. Web. 21 Jul. 2012.
  8. ^ Basilio Catania Homepage
  9. ^ L'invenzione del telefono da parte di Meucci e la sua sventurata e ingiusta conclusione
  10. ^ Meucci, website
  11. ^ website
  12. ^ Basilio Catania's reconstruction, in English
  13. ^ Picture of the acoustic telephone, page maintained by the Italian Society of Electrotechnics
  14. ^ Meucci's original drawings. Page maintained by the Italian Society of Electrotechnics
  15. ^ Meucci's original drawings. Page maintained by the Italian Society of Electrotechnics Archived July 28, 2010, at the Wayback Machine
  16. ^ Affidavit of lawyer Michael Lemmi
  17. ^ Scientific American Supplement No. 520, December 19, 1885
  18. ^ Meucci's 1871 patent caveat, pages 16-18
  19. ^ a b DUQUET, Cyrille
  20. ^ Inventors Digest, July/August 1998, p. 26-28
  21. ^ American Treasures of the Library of Congress ... Bell - Lab notebook
  22. ^ Puleo, Stephen (2011). A City So Grand: The Rise of an American Metropolis, Boston 1850-1900. Beacon Press. p. 195. ISBN 978-0807001493.
  23. ^ Robert Bruce (1990), pages 102–103, 110–113, 120–121
  24. ^ Robert Bruce (1990), pages 104–109
  25. ^ Robert Bruce (1990), pages 146–148
  26. ^ a b Robert Bruce (1990), page 149
  27. ^ Puleo, Stephen (2011). A City So Grand: The Rise of an American Metropolis, Boston 1850-1900. Beacon Press. p. 195. ISBN 978-0807001493.
  28. ^
  29. ^ US 174465 Alexander Graham Bell: "Improvement in Telegraphy" filed on February 14, 1876, granted on March 7, 1876.
  30. ^ Shulman, pages 36-37. Bell's lab notes dated March 9, 1876 show a drawing of a person speaking face down into a liquid transmitter very similar to the liquid transmitter depicted as Fig. 3 in Gray's caveat.
  31. ^ Evenson, page 99.
  32. ^ Evenson, page 98.
  33. ^ Evenson, page 100.
  34. ^ a b c d "First Telephone Office", CWB, November 17, 1971, pp. 4–5.
  35. ^ "You Can Tour The House in Brantford Where Bell Worked on His Telephone", Toronto Daily Star, December 26, 1970.
  36. ^ MacLeod, Elizabeth. Alexander Graham Bell: An Inventive Life, Toronto, Ontario, Canada: Kids Can Press, 1999, ISBN 1-55074-456-9, p. 14.
  37. ^ "Bell Emphatic in Declaring That Telephone Was Invented Here", Brantford Expositor, August 10, 1936, p. 15.
  38. ^ "Use of Stove Pipe Wire Is Related at Banquet: Graham Tells Of Some Early Experiments", Brantford Expositor, August 10, 1936, p. 17.
  39. ^ Patten, William; Bell, Alexander Melville. Pioneering The Telephone In Canada, Montreal: Herald Press, 1926. N.B.: Patten's full name was William Patten, not Gulielmus Patten as credited elsewhere.
  40. ^ Patten & Bell, 1926, p. 15–16, 19.
  41. ^ "The Bell Homestead", Montreal, Canada: Telephone Historical Collection, The Bell Telephone Co. of Canada, December 29, 1954, pp. 1–2.
  42. ^ Harrington, Stephanie. "Bell Homestead: Home Offers In-depth Look At Inventor", Brantford and Brant County Community Guide, 2002–2003", Brantford Expositor, 2002.
  43. ^ Korfmann, Margret. "Homestead's History Highlighted", Brantford Expositor, February 22, 1985.
  44. ^ a b "A .G. Bell's Brantford House Is Museum of the Telephone", Toronto Star, April 25, 1987, p. H-23.
  45. ^ "First Long Distance Telephone Call Recalled", Brantford Expositor, August 11, 1976.
  46. ^ Butorac, Yvonne (June 29, 1995). "Bell's Brantford Homestead Celebrates Phone Invention". Toronto Star. p. G10. ProQuest document ID 437257031.
  47. ^ Munro, John. Heroes of the Telegraph, London: The Religious tract society, 1891. Note: public domain text
  48. ^ "Milestones:First Intelligible Voice Transmission over Electric Wire, 1876". IEEE Global History Network. IEEE. Retrieved July 27, 2011.
  49. ^ Burton Baker, pages 90–91
  50. ^ Puskás Tivadar (1844–1893) (short biography), Hungarian History website. Retrieved from, February 2013.
  51. ^ "Puskás Tivadar (1844–1893)". Archived from the original on October 8, 2010. Retrieved July 1, 2012.
  52. ^ "Puskás, Tivadar". Retrieved July 1, 2012.
  53. ^ "Puskás Tivadar". Archived from the original on March 16, 2012. Retrieved July 1, 2012.
  54. ^ Frank Lewis Dyer and Thomas Commerford Martin. Edison, His Life And Inventions, Harper & Brothers, 1910, p. 71. Retrieved from
  55. ^ Evenson, pp 64–69, 86–87, 110, 194–196
  56. ^ Evenson, pages 68–69
  57. ^ a b c Whitaker, A.J. Bell Telephone Memorial, City of Brantford/Hurley Printing, Brantford, Ontario, 1944.
  58. ^ a b c Osborne, Harold S. (1943) Biographical Memoir of Alexander Graham Bell, National Academy of Sciences: Biographical Memoirs, Vol. XXIII, 1847–1922. Presented to the Academy at its 1943 annual meeting.

Further reading

External links


  • US 161739 Transmitter and Receiver for Electric Telegraphs (tuned steel reeds) by Alexander Graham Bell (April 6, 1875)
  • US 174465 Telegraphy (Bell's first telephone patent) by Alexander Graham Bell (March 7, 1876)
  • US 178399 Telephonic Telegraphic Receiver (vibrating reed) by Alexander Graham Bell (June 6, 1876)
  • US 181553 Generating Electric Currents (magneto) by Alexander Graham Bell (August 29, 1876)
  • US 186787 Electric Telegraphy (permanent magnet receiver) by Alexander Graham Bell (January 15, 1877)
  • US 201488 Speaking Telephone (receiver designs) by Alexander Graham Bell (March 19, 1878)
  • US 213090 Electric Speaking Telephone (frictional transmitter) by Alexander Graham Bell (March 11, 1879)
  • US 220791 Telephone Circuit (twisted pairs of wire) by Alexander Graham Bell (October 21, 1879)
  • US 228507 Electric Telephone Transmitter (hollow ball transmitter) by Alexander Graham Bell (June 8, 1880)
  • US 230168 Circuit for Telephone by Alexander Graham Bell (July 20, 1880)
  • US 238833 Electric Call-Bell by Alexander Graham Bell (March 15, 1881)
  • US 241184 Telephonic Receiver (local battery circuit with coil) by Alexander Graham Bell (May 10, 1881)
  • US 244426 Telephone Circuit (cable of twisted pairs) by Alexander Graham Bell (July 19, 1881)
  • US 250126 Speaking Telephone by Francis Blake (November 29, 1881)
  • US 252576 Multiple Switch Board for Telephone Exchanges by Leroy Firman (Western Electric) (January 17, 1882)
  • US 474230 Speaking Telegraph (graphite transmitter) by Thomas Edison (Western Union) May 3, 1892
  • US 203016 Speaking Telephone (carbon button transmitter) by Thomas Edison
  • US 222390 Carbon Telephone (carbon granules transmitter) by Thomas Edison
  • US 485311 Telephone (solid back carbon transmitter) by Anthony C. White (Bell engineer) November 1, 1892
  • US 597062 Calling Device for Telephone Exchange (dial) by A. E. Keith (January 11, 1898)
  • US 687499 Telephone Transmitter (carbon granules "candlestick" microphone) by W.W. Dean (Kellogg Co.) November 26, 1901
  • US 815176 Automatic Telephone Connector Switch (for rotary dial phones) by A E Keith and C J Erickson March 13, 1906
Acoustic telegraphy

Acoustic telegraphy (also known as harmonic telegraphy) was a name for various methods of multiplexing (transmitting more than one) telegraph messages simultaneously over a single telegraph wire by using different audio frequencies or channels for each message. A telegrapher used a conventional Morse key to tap out the message in Morse code. The key pulses were transmitted as pulses of a specific audio frequency. At the receiving end a device tuned to the same frequency resonated to the pulses but not to others on the same wire.

Inventors who worked on the acoustic telegraph included Charles Bourseul, Thomas Edison, Elisha Gray, and Alexander Graham Bell. Their efforts to develop acoustic telegraphy, in order to reduce the cost of telegraph service, led to the invention of the telephone.Some of Thomas Edison's devices used multiple synchronized tuning forks tuned to selected audio frequencies and which opened and closed electrical circuits at the selected audio frequencies. Acoustic telegraphy was similar in concept to present-day FDMA, or Frequency Division Multiple Access, used with radio frequencies.

The word acoustic comes from the Greek akoustikos meaning hearing, as with hearing of sound waves in air. Acoustic telegraphy devices were electromechanical and made musical or buzzing or humming sound waves in air for a few feet. But the primary function of these devices was not to generate sound waves, but rather to generate alternating electrical currents at selected audio frequencies in wires which transmitted telegraphic messages electrically over long distances.

Antonio Meucci

Antonio Santi Giuseppe Meucci (Italian: [anˈtɔːnjo meˈuttʃi]; 13 April 1808 – 18 October 1889) was an Italian inventor and an associate of Giuseppe Garibaldi (a major political figure in the history of Italy). Meucci is best known for developing a voice-communication apparatus that several sources credit as the first telephone.Meucci set up a form of voice-communication link in his Staten Island, New York, home that connected the second-floor bedroom to his laboratory. He submitted a patent caveat for his telephonic device to the U.S. Patent Office in 1871, but there was no mention of electromagnetic transmission of vocal sound in his caveat. In 1876, Alexander Graham Bell was granted a patent for the electromagnetic transmission of vocal sound by undulatory electric current. Despite the longstanding general crediting of Bell with the accomplishment, the Italian government later honored Meucci with the title "Inventore ufficiale del telefono" or "Official inventor of the telephone". The U.S. House of Representatives also honored Meucci in a resolution in 2002 for having had some role in the development of the telephone (although the U.S. Senate did not join the resolution and the interpretation of the resolution is disputed).

Bell Homestead National Historic Site

The Bell Homestead National Historic Site, located in Brantford, Ontario, Canada, also known by the name of its principal structure, Melville House, was the first North American home of Professor Alexander Melville Bell and his family, including his last surviving son, scientist Alexander Graham Bell. The younger Bell conducted his earliest experiments in North America there, and later invented the telephone at the Homestead in July 1874. In a 1906 speech to the Brantford Board of Trade, Bell made the following comment, "the telephone problem was solved, and it was solved at my father's home".The approximately 4-hectare (10​1⁄2 acre) site has been largely restored to its appearance when the Bells lived there in the 1870s, and Melville House now serves as a museum to the family and to the invention of the telephone. A large visitor reception centre has also been added adjacent to Melville House.

The Henderson Home building was later added to the Homestead in 1969, being moved there from its original location in downtown Brantford. It was Canada's first telephone company business office, opened in 1877 as a predecessor of the Bell Telephone Company of Canada. After being moved to the Bell Homestead it was converted into an adjunct museum on the development of telephone technology. The Homestead is operated by the Bell Homestead Committee of the City of Brantford.The Homestead was named a National Historic Site on June 1, 1996, and was listed on the national Register of Historic Places on June 22, 2009. The replacement for a federal commemorative plaque was unveiled the following year by Queen Elizabeth II during the 150th anniversary year celebrations for the birth of Alexander Graham Bell. Melville House has been described as "... this shrine, where lingers the spirit of the great inventor".

Bell Memorial

The Bell Memorial (also known as the Bell Monument or Telephone Monument) is a memorial designed by Walter Seymour Allward to commemorate the invention of the telephone by Alexander Graham Bell at the Bell Homestead National Historic Site, in Brantford, Ontario, Canada.

In 1906, the citizens of the Brantford and Brant County areas formed the Bell Telephone Memorial Association, which commissioned the memorial. By 1908, the association's designs committee asked sculptors on two continents to submit proposals for the memorial. The submission by Canadian sculptor Walter Seymour Allward of Toronto won the competition. The memorial was originally scheduled for completion by 1912 but Allward, aided by his studio assistant Emanuel Hahn did not finish it until five years later. The Governor General of Canada, Victor Cavendish, 9th Duke of Devonshire, unveiled the memorial on 24 October 1917.

Allward designed the monument to symbolize the telephone's ability to overcome great distances. A series of steps lead to the main section where the floating allegorical figure of Inspiration appears over a reclining male figure representing Man, transmitting sound through space, discovering his power to transmit sound through space, and also pointing to three floating figures, the messengers of Knowledge, Joy, and Sorrow positioned at the other end of the tableau. Additionally, there are two female figures mounted on granite pedestals representing Humanity positioned to the left and right of the memorial, one sending and the other receiving a message.

The Bell Memorial has been described as the finest example of Allward's early work. The memorial itself has been used as a central fixture for many civic events and remains an important part of Brantford's history. It was provided a heritage designation under the Ontario Heritage Act in 2005 and listed on the Canadian Register of Historic Places in 2009.

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 England Telephone and Telegraph Company. The Bell Telephone Company was started on the basis of holding "potentially valuable patents", principally Bell's master telephone patent #174465.The two companies merged on February 17, 1879, to form two new entities, the National Bell Telephone Company of Boston, and the International Bell Telephone Company, soon after established by Hubbard and which became headquartered in Brussels, Belgium. Theodore Vail then took over its operations at that point, becoming a central figure in its rapid growth and commercial success.

The National Bell Telephone Company merged with American Speaking Telephone Company on March 20, 1880, to form the American Bell Telephone Company, also of Boston, Massachusetts.Upon its inception, the Bell Telephone Company was organized with Hubbard as "trustee", although he was additionally its de facto president, since he also controlled his daughter's shares by power of attorney, and with Thomas Sanders, its principal financial backer, as treasurer. The American Bell Telephone Company evolved into the American Telephone & Telegraph Company (AT&T), at times the world's largest telephone company.


Brantford (2016 population 97,496; CMA population 134,203) is a city in southwestern Ontario, Canada, founded on the Grand River. It is surrounded by Brant County, but is politically separate with a municipal government of its own that is fully independent of the county's municipal government.Brantford is named after Joseph Brant, an important Mohawk chief during the American Revolutionary War and later, who led his people in their first decades in Upper Canada. Many of his descendants, and other First Nations citizens, live on the nearby Reserve of Six Nations of the Grand River, 20 kilometers from Brantford; it is the most populous reserve in Canada. Brantford is often known as the "Telephone City". The city's famous resident, Alexander Graham Bell, invented the device at his father's homestead, Melville House, now the Bell Homestead.

Canadian Parliamentary Motion on Alexander Graham Bell

The first session of Canada's 37th Parliament unanimously passed a Canadian Parliamentary Motion on Alexander Graham Bell on June 21, 2002, to affirm that Alexander Graham Bell was the inventor of the telephone.The symbolic motion was a response to the 107th United States Congress' earlier resolution (HRes 269) of June 11, 2002, which recognized the contributions of Antonio Meucci. Due to a misleading press release issued by U.S. Congressman Vito Fossella, this was interpreted by some as establishing priority for the invention of the telephone to Meucci. The House of Representatives' Resolution and the Parliamentary Motion which followed were both opinions and did not carry any legal weight. The resolution also did not annul or modify any of Bell's patents for the telephone.

During the 108th Congress another almost identical resolution, SRes 223 was introduced in the United States Senate, but which was then sent to a committee where it died, unenacted.The Canadian Parliamentary Motion and Resolution HRes 269 were both widely reported by various news media at the time of their proclamations.

County of Brant

The County of Brant (2016 population 36,707) is a single-tier municipality in the Canadian province of Ontario. Despite its name, it is no longer a county by definition, as all municipal services are handled by a single level of government. The county has service offices in Burford, Paris and St. George.

It is a predominantly rural municipality in Southern Ontario. The largest population centre (2016 population, 12,310) is Paris. The County is bordered by North Dumfries township, the City of Hamilton, Haldimand County, Norfolk County, and the townships of Blandford-Blenheim and Norwich. The County abuts the provincially-mandated Greenbelt (Golden Horseshoe).

Although the city of Brantford appears geographically to be located in the County, it is a fully independent city with its own municipal government. The Brant census division, which includes Brantford and the Six Nations and New Credit reserves, along with the County of Brant, had a population of 134,808 in the 2016 census.

Field telephone

Field telephones are telephones used for military communications. They can draw power from their own battery, from a telephone exchange (via a central battery known as CB), or from an external power source. Some need no battery, being sound-powered telephones.

Field telephones replaced flag signals and the telegraph as an efficient means of communication. The first field telephones had a wind-up generator, used to power the telephone's ringer & batteries to send the call, and call the manually operated telephone central. This technology was used from the 1910s to the 1960s. Later the ring signal has been made electronically operated by a pushbutton, or automatic as on domestic telephones. The manual systems are still widely used, and are often compatible with the older equipment.

Shortly after the invention of the telephone attempts were made to adapt the technology for military use. Telephones were already being used to support military campaigns in British India and in British colonies in Africa in the late 1870s and early 1880s. In the United States telephone lines connected fortresses with each other and with army headquarters. They were also used for fire control at fixed coastal defence installations. The first telephone for use in the field was developed in the United States in 1889 but it was too expensive for mass production. Subsequent developments in several countries made the field telephone more practicable. The wire material was changed from iron to copper, devices for laying wire in the field were developed and systems with both battery-operated sets for command posts and hand generator sets for use in the field were developed. The first purposely-designed field telephones were used by the British in the Second Boer War. They were used more extensively in the Russo-Japanese War, where all infantry regiments and artillery divisions on both sides were equipped with telephone sets. By the First World War the use of field telephones was widespread.Field telephones operate over wire lines, sometimes commandeering civilian circuits when available, but often using wires strung in combat conditions. At least as of World War II, wire communications were the preferred method for the U.S. Army, with radio use only when needed, e.g. to communicate with mobile units, or until wires could be set up. Field phones could operate point to point or via a switchboard at a command post. A variety of wire types are used, ranging from light weight "assault wire," e.g. W-130 —8.5 kilograms per kilometre (30 pounds per mile)— with a talking range about 8.0 kilometres (5 mi), to heavier cable with multiple pairs. Equipment for laying the wire ranges from reels on backpacks to trucks equipped with plows to bury lines.

History of the telephone

This history of the telephone chronicles the development of the electrical telephone, and includes a brief review of its predecessors.

IEEE Alexander Graham Bell Medal

The IEEE Alexander Graham Bell Medal is an award honoring "exceptional contributions to the advancement of communications sciences and engineering" in the field of telecommunications. The medal is one of the highest honor awarded by the Institute of Electrical and Electronics Engineers for achievements in telecommunication sciences and engineering.

It was instituted in 1976 by the directors of the world's largest professional society, the Institute of Electrical and Electronics Engineers (IEEE), commemorating the centennial of the invention of the telephone by Alexander Graham Bell. The award is presented either to an individual, or to a team of two or three persons.The institute's reasoning for the award was described thus:

The invention of the telephone by Alexander Graham Bell in 1876 was a major event in electrotechnology. It was instrumental in stimulating the broad telecommunications industry that has dramatically improved life throughout the world. As an individual, Bell himself exemplified the contributions that scientists and engineers have made to the betterment of mankind.

Recipients of the award receive a gold medal, bronze replica, certificate, and an honorarium.

Johann Philipp Reis

Johann Philipp Reis (German: [ʁaɪs]; January 7, 1834 – January 14, 1874) was a self-taught German scientist and inventor. In 1861, he constructed the first make-and-break telephone, today called the Reis telephone.


Meucci is a surname of Italian origin that may refer to:

Antonio Meucci (1808–1889), Italian-American inventor sometimes credited with invention of the telephone

Attilio Meucci (born 1970), Italian mathematician and financial engineer

Daniele Meucci (born 1985), Italian long-distance runner

Michaelangelo Meucci (1840–1890), Italian painter

Vincenzo Meucci (1694–1766), Italian late-Baroque painter

Telecommunications in Mauritius

Telecommunications had an early beginning in Mauritius, with the first telephone line installed in 1883, seven years after the invention of the telephone. Over the years, the network and telephony improved. By the late 20th century, the rapid development and convergence of information and telecommunications technologies gave rise to an ICT industry on the island along with many incentives provided by the government. The government thus aims to make the ICT sector the 5th pillar of the Mauritian economy and Mauritius a Cyber Island. Historically, the country is known for tourism, rather than its call centers and business process outsourcing.

The Telephone Cases

The Telephone Cases, 126 U.S. 1 (1888), were a series of U.S. court cases in the 1870s and 1880s related to the invention of the telephone, which culminated in the 1888 decision of the United States Supreme Court upholding the priority of the patents belonging to Alexander Graham Bell. Those telephone patents were relied on by the American Bell Telephone Company and the Bell System—although they had also acquired critical microphone patents from Emile Berliner.

The objector (or plaintiff) in the notable Supreme Court case was initially the Western Union telegraph company, which was at the time a far larger and better financed competitor than American Bell Telephone. Western Union advocated several more recent patent claims of Daniel Drawbaugh, Elisha Gray, Antonio Meucci and Philip Reis in a bid to invalidate Alexander Graham Bell's master and subsidiary telephone patents dating back to March 1876. Had Western Union succeeded it would have immediately destroyed the Bell Telephone Company and then Western Union stood to become the world's largest telecommunications monopoly in Bell's place.

The U.S. Supreme Court came within one vote of overturning the Bell patent, thanks to the eloquence of lawyer Lysander Hill for the Peoples Telephone Company. In a lower court, the Peoples Telephone Company stock rose briefly during the early proceedings, but dropped after their claimant Daniel Drawbaugh took the stand and drawled: "I don’t remember how I came to it. I had been experimenting in that direction. I don’t remember of getting at it by accident either. I don’t remember of anyone talking to me of it".In this case the court affirmed several other lower court cases: Dolbear et al. v American Bell Tel. Co., 15 Fed. Rep 448, 17 Fed. Rep. 604, Molecular Te. Co. et al. v American Bell Tel. Co. 32 Fed. Rep 214, People's Tel. Co. et al. v American Bell Tel. Co., 22 Fed. Rep. 309 and 25 Fed. Rep. 725. Well reversing American Bell Tel Co. et al. v Molecular Tel. Co et al. 32 Fed Rep. 214.

Bell’s second fundamental patent expired on January 30, 1894, at which time the gates were then opened to independent telephone companies to compete with the Bell System. In all, the American Bell Telephone Company and its successor, AT&T, litigated 587 court challenges to its patents including five that went to the U.S. Supreme Court, and aside from two minor contract lawsuits, never lost a single one that was concluded with a final stage judgment.

Thomas A. Watson

Thomas A Augustus Watson (January 18, 1854 – December 13, 1934) was an assistant to Alexander Graham Bell, notably in the invention of the telephone in 1876. He is best known because, as the recipient of the first telephone call – although coming from just the next room – his name became the first words ever said over the phone. "Mr. Watson – Come here – I want to see you,"

Bell said when first using the new invention, according to Bell's laboratory notebook. There is some dispute about the actual words used, as Thomas Watson, in his own voice, remembered it as "Mr. Watson – Come here – I want you," in a film made for Bell Labs in 1931 which is referenced below in "The Engines of our Ingenuity."

United States HRes. 269 on Antonio Meucci

The 107th United States Congress resolution (HRes 269) of June 11, 2002, recognized the contributions of Antonio Meucci. This was interpreted by some as establishing priority for the invention of the telephone to Meucci, and indeed its preamble said that "if Meucci had been able to pay the $10 fee ..., no patent could have been issued to Bell" and contained other pointed remarks about Bell and a legal dispute of the late 1800s over the invention priority. However, the House of Representatives' resolution did not annul or modify the status of any of Bell's patents for the telephone or have any other legal effect.

During the 108th Congress another resolution, SRes 223 was introduced in the United States Senate and died, unenacted.Shortly afterward, the Canadian government passed a similar motion declaring Alexander Graham Bell the inventor of the telephone. The HRes 269 resolution was widely reported by various news media at the time and is still cited by Meucci advocates as proof that he has been acknowledged as the first inventor of the telephone. The resolution has equally been criticized for its factual errors, inaccuracies, biases and distortions.

Volta Prize

The Volta Prize (French: prix Volta) was originally established by Napoleon III during the Second French Empire in 1852 to honor Alessandro Volta, an Italian physicist noted for developing the electric battery. This international prize awarded 50,000 French francs to extraordinary scientific discoveries related to electricity. The prize was instituted by the Ministry of Public Instruction with the personal funding of the French Emperor, the selection committee was usually constituted by members of the French Academy of Sciences.Notable recipients have included, Heinrich Ruhmkorff, who commercialised the induction coil, and Zénobe Gramme, inventor of the Gramme dynamo and the first practical electric motor used in industry.

One of its most notable awards was made in 1880, when Alexander Graham Bell received the fourth edition of the Volta Prize for the invention of the telephone. Among the committee members who judged were Victor Hugo and Alexandre Dumas, fils. Since Bell was himself becoming more affluent, he used the prize money to create institutions in and around Washington, D.C., including the prestigious Volta Laboratory Association in 1880 (also known as the 'Volta Laboratory' and as the 'Alexander Graham Bell Laboratory') precursor to Bell Labs, with his endowment fund (the 'Volta Fund'), and then in 1887 the 'Volta Bureau', which later became the Alexander Graham Bell Association for the Deaf and Hard of Hearing (AG Bell).

The prize was discontinued in 1888.

Network topology
and switching

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