Marconi was born into the Italian nobility as Guglielmo Giovanni Maria Marconi[10][11] in Palazzo Marescalchi in Bologna on 25 April 1874, the second son of Giuseppe Marconi (an Italian aristocratic landowner from Porretta Terme) and his Irish wife Annie Jameson (daughter of Andrew Jameson of Daphne Castle in County Wexford, Ireland, and granddaughter of John Jameson, founder of whiskey distillers Jameson & Sons).[12][13] Marconi had a brother, Alfonso, and a stepbrother, Luigi. Between the ages of two and six, Marconi and his older brother Alfonso lived with their mother in the English town of Bedford.[14][15]
Education
Marconi did not attend school as a child and did not go on to formal higher education.[16][17][18] Instead, he learned chemistry, mathematics, and physics at home from a series of private tutors hired by his parents. His family hired additional tutors for Guglielmo in the winter when they would leave Bologna for the warmer climate of Tuscany or Florence.[18] Marconi noted an important mentor was professor Vincenzo Rosa, a high school physics teacher in Livorno.[19][17] Rosa taught the 17-year-old Marconi the basics of physical phenomena as well as new theories on electricity. At the age of 18 and back in Bologna, Marconi became acquainted with University of Bologna physicist Augusto Righi, who had done research on Heinrich Hertz's work. Righi permitted Marconi to attend lectures at the university and also to use the university's laboratory and library.[20]
Radio work
From youth, Marconi was interested in science and electricity. In the early 1890s, he began working on the idea of "wireless telegraphy"—i.e., the transmission of telegraph messages without connecting wires as used by the electric telegraph. This was not a new idea; numerous investigators and inventors had been exploring wireless telegraph technologies and even building systems using electric conduction, electromagnetic induction and optical (light) signalling for over 50 years, but none had proven technically and commercially successful. A relatively new development came from Heinrich Hertz, who, in 1888, demonstrated that one could produce and detect electromagnetic radiation, based on the work of James Clerk Maxwell. At the time, this radiation was commonly called "Hertzian" waves, and is now generally referred to as radio waves.[21]
There was a great deal of interest in radio waves in the physics community, but this interest was in the scientific phenomenon, not in its potential as a communication method. Physicists generally looked on radio waves as an invisible form of light that could only travel along a line of sight path, limiting its range to the visual horizon like existing forms of visual signaling.[22] Hertz's death in 1894 brought published reviews of his earlier discoveries including a demonstration on the transmission and detection of radio waves by the British physicist Oliver Lodge and an article about Hertz's work by Augusto Righi. Righi's article renewed Marconi's interest in developing a wireless telegraphy system based on radio waves,[23] a line of inquiry that Marconi noted other inventors did not seem to be pursuing.[24]
Developing radio telegraphy
Marconi's first transmitter incorporating a monopole antenna. It consisted of an elevated copper sheet (top) connected to a Righi spark gap (left) powered by an induction coil(center) with a telegraph key(right) to switch it on and off to spell out text messages in Morse code.
At the age of 20, Marconi began to conduct experiments in radio waves, building much of his own equipment in the attic of his home at the Villa Griffone in Pontecchio (now an administrative subdivision of Sasso Marconi), Italy, with the help of his butler, Mignani. Marconi built on Hertz's original experiments and, at the suggestion of Righi, began using a coherer, an early detector based on the 1890 findings of French physicist Édouard Branly and used in Lodge's experiments, that changed resistance when exposed to radio waves.[25] In the summer of 1894, he built a storm alarm made up of a battery, a coherer, and an electric bell, which went off when it picked up the radio waves generated by lightning.
Late one night, in December 1894, Marconi demonstrated a radio transmitter and receiver to his mother, a set-up that made a bell ring on the other side of the room by pushing a telegraphic button on a bench.[26][25] Supported by his father, Marconi continued to read through the literature and picked up on the ideas of physicists who were experimenting with radio waves. He developed devices, such as portable transmitters and receiver systems, that could work over long distances,[24] turning what was essentially a laboratory experiment into a useful communication system.[27] Marconi came up with a functional system with many components:[28]
A wire or metal sheet capacity area suspended at a height above the ground;
A coherer receiver, which was a modification of Édouard Branly's original device with refinements to increase sensitivity and reliability;
A telegraph key to operate the transmitter to send short and long pulses, corresponding to the dots-and-dashes of Morse code; and
A telegraph register activated by the coherer which recorded the received Morse code dots and dashes onto a roll of paper tape.
In the summer of 1895, Marconi moved his experiments outdoors on his father's estate in Bologna. He tried different arrangements and shapes of antenna but even with improvements he was able to transmit signals only up to one half-mile, a distance Oliver Lodge had predicted in 1894 as the maximum transmission distance for radio waves.[29]
Transmission breakthrough
A breakthrough came in the summer of 1895, when Marconi found that much greater range could be achieved after he raised the height of his antenna and, borrowing from a technique used in wired telegraphy, grounded his transmitter and receiver. With these improvements, the system was capable of transmitting signals up to 2 miles (3.2km) and over hills.[30][31] The monopole antenna reduced the frequency of the waves compared to the dipole antennas used by Hertz, and radiated vertically polarized radio waves which could travel longer distances. By this point, he concluded that a device could become capable of spanning greater distances, with additional funding and research, and would prove valuable both commercially and militarily. Marconi's experimental apparatus proved to be the first engineering-complete, commercially successful radio transmission system.[32][33][34]
Marconi applied to the Ministry of Post and Telegraphs, then under the direction of Maggiorino Ferraris,[35] explaining his wireless telegraph machine and asking for funding, but never received a response. An apocryphal tale claims that the minister (incorrectly named first as Emilio Sineo, later as Pietro Lacava[36]) wrote "to the Longara" on the document, referring to the insane asylum on Via della Lungara in Rome, but the letter was never found.[37]
In 1896, Marconi spoke with his family friend Carlo Gardini, Honorary Consul at the United States Consulate in Bologna, about leaving Italy to go to Great Britain. Gardini wrote a letter of introduction to the Ambassador of Italy in London, Annibale Ferrero, explaining who Marconi was and about his extraordinary discoveries. In his response, Ambassador Ferrero advised them not to reveal Marconi's results until after a patent was obtained. He also encouraged Marconi to come to Britain, where he believed it would be easier to find the necessary funds to convert his experiments into practical use. Finding little interest or appreciation for his work in Italy, Marconi travelled to London in early 1896 at the age of 21, accompanied by his mother, to seek support for his work. (He spoke fluent English in addition to Italian.) Marconi arrived at Dover, and the Customs officer opened his case to find various apparatus. The customs officer immediately contacted the Admiralty in London. While there, Marconi gained the interest and support of William Preece, the Chief Electrical Engineer of the General Post Office (the GPO). During this time Marconi decided he should patent his system, which he applied for on 2 June 1896, British Patent number 12039 titled "Improvements in Transmitting Electrical impulses and Signals, and in Apparatus therefor", which would become the first patent for a radio wave based communication system.[38]
British Post Office engineers inspect Marconi's radio equipment during a demonstration on Flat Holm Island, 13 May 1897. The transmitter is at centre, the coherer receiver below it, and the pole supporting the wire antenna is visible at top.
Marconi made the first demonstration of his system for the British government in July 1896.[39] A further series of demonstrations for the British followed, and, by March 1897, Marconi had transmitted Morse code signals over a distance of about 6 kilometres (3.7mi) across Salisbury Plain. On 13 May 1897, Marconi sent the first ever wireless communication over open sea – a message was transmitted over the Bristol Channel from Flat Holm Island to Lavernock Point near Cardiff, a distance of 6 kilometres (3.7mi). The message read, "Are you ready".[40] The transmitting equipment was almost immediately relocated to Brean Down Fort on the Somerset coast, stretching the range to 16 kilometres (9.9mi).
Plaque on the outside of the BT Centre commemorates Marconi's first public transmission of wireless signals.
Impressed by these and other demonstrations, Preece introduced Marconi's ongoing work to the general public at two important London lectures: "Telegraphy without Wires", at the Toynbee Hall on 11 December 1896; and "Signalling through Space without Wires", given to the Royal Institution on 4 June 1897.[41][42]
Numerous additional demonstrations followed, and Marconi began to receive international attention. In July 1897, he carried out a series of tests at La Spezia, in his home country, for the Italian government. A test for Lloyd's between The Marine Hotel in Ballycastle and Rathlin Island, both in County Antrim in Ulster, Ireland, was conducted on 6 July 1898 by George Kemp and Edward Edwin Glanville.[43] A transmission across the English channel was accomplished on 27 March 1899, from Wimereux, France to South Foreland Lighthouse, England. Marconi set up an experimental base at the Haven Hotel, Sandbanks, Poole Harbour, Dorset, where he erected a 100-foot high mast. He became friends with the van Raaltes, the owners of Brownsea Island in Poole Harbour, and his steam yacht, the Elettra, was often moored on Brownsea or at The Haven Hotel. Marconi purchased the vessel after the Great War and converted it to a seaborne laboratory from where he conducted many of his experiments. Among the Elettra's crew was Adelmo Landini, his personal radio operator, who was also an inventor.[44]
In December 1898, the British lightship service authorised the establishment of wireless communication between the South Foreland lighthouse at Dover and the East Goodwin lightship, twelve miles distant. On 17 March 1899, the East Goodwin lightship sent the first wireless distress signal, a signal on behalf of the merchant vessel Elbe which had run aground on Goodwin Sands. The message was received by the radio operator of the South Foreland lighthouse, who summoned the aid of the Ramsgate lifeboat.[45][46]
SS Ponce entering New York Harbor 1899, by Milton J. Burns
In the autumn of 1899, his first demonstration in the United States took place. Marconi had sailed to the U.S. at the invitation of The New York Herald newspaper to cover the America's Cup international yacht races off Sandy Hook, New Jersey. The transmission was done aboard the SS Ponce, a passenger ship of the Porto Rico Line.[47] Marconi left for England on 8 November 1899 on the American Line's SSSaint Paul, and he and his assistants installed wireless equipment aboard during the voyage. Prior to this voyage the Second Boer War had begun, and Marconi's wireless would bring news of the conflict to passengers at the request of "some of the officials of the American line."[48] On 15 November the SS Saint Paul became the first ocean liner to report her imminent return to Great Britain by wireless when Marconi's Royal Needles Hotel radio station contacted her 66 nautical miles off the English coast. The first Transatlantic Times, a newspaper containing wireless transmission news from the Needles Station at the Isle of Wight, was published on board the SS Saint Paul prior to its arrival.[49]
Transatlantic transmissions
Marconi watching associates raising the kite (a "Levitor" by B.F.S. Baden-Powell ) used to lift the antenna at St. John's, Newfoundland, December 1901Magnetic detector by Marconi used during the experimental campaign aboard a ship in summer 1902, exhibited at the Museo Nazionale Scienza e Tecnologia Leonardo da Vinci of Milan.
At the turn of the 20th century, Marconi began investigating a means to signal across the Atlantic to compete with the transatlantic telegraph cables. Marconi established a wireless transmitting station at Marconi House, Rosslare Strand, County Wexford, in 1901 to act as a link between Poldhu in Cornwall, England, and Clifden in Connemara, County Galway, Ireland. He soon made the announcement that the message was received at Signal Hill in St. John's, Newfoundland (now part of Canada), on 12 December 1901, using a 500-foot (150m) kite-supported antenna for reception—signals transmitted by the company's new high-power station at Poldhu, Cornwall. The distance between the two points was about 2,200 miles (3,500km). It was heralded as a great scientific advance, yet there also was—and continues to be—considerable scepticism about this claim. The exact wavelength used is not known, but it is fairly reliably determined to have been in the neighbourhood of 350 meters (frequency ≈ 850kHz). The tests took place at a time of day during which the entire transatlantic path was in daylight. It is now known (although Marconi did not know then) that this was the worst possible choice. At this medium wavelength, long-distance transmission in the daytime is not possible because of heavy absorption of the skywave in the ionosphere. It was not a blind test; Marconi knew in advance to listen for a repetitive signal of three clicks, signifying the Morse code letter S. The clicks were reported to have been heard faintly and sporadically. There was no independent confirmation of the reported reception, and the transmissions were difficult to distinguish from atmospheric noise. A detailed technical review of Marconi's early transatlantic work appears in John S. Belrose's work of 1995. The Poldhu transmitter was a two-stage circuit.[51][52]
Marconi demonstrating apparatus he used in his first long-distance radio transmissions in the 1890s. The transmitter is at right, the receiver with paper tape recorder at left.Marconi caricatured by Leslie Ward for Vanity Fair, 1905
Feeling challenged by sceptics, Marconi prepared a better organised and documented test. In February 1902, the SS Philadelphia sailed west from Great Britain with Marconi aboard, carefully recording signals sent daily from the Poldhu station. The test results produced coherer-tape reception up to 1,550 miles (2,490km), and audio reception up to 2,100 miles (3,400km). The maximum distances were achieved at night, and these tests were the first to show that radio signals for medium wave and longwave transmissions travel much farther at night than in the day. During the daytime, signals had been received up to only about 700 miles (1,100km), less than half of the distance claimed earlier at Newfoundland, where the transmissions had also taken place during the day. Because of this, Marconi had not fully confirmed the Newfoundland claims, although he did prove that radio signals could be sent for hundreds of kilometres (miles), despite some scientists' belief that they were limited essentially to line-of-sight distances.
On 17 December 1902, a transmission from the Marconi station in Glace Bay, Nova Scotia, Canada, became the world's first radio message to cross the Atlantic from North America. In 1901, Marconi built a station near South Wellfleet, Massachusetts, that sent a message of greetings on 18 January 1903 from United States President Theodore Roosevelt to King Edward VII of the United Kingdom. However, consistent transatlantic signalling was difficult to establish.[53]
Marconi began to build high-powered stations on both sides of the Atlantic to communicate with ships at sea, in competition with other inventors. In 1904, he established a commercial service to transmit nightly news summaries to subscribing ships, which could incorporate them into their on-board newspapers. A regular transatlantic radio-telegraph service was finally begun on 17 October 1907[54][55] between Clifden, Ireland, and Glace Bay, but even after this the company struggled for many years to provide reliable communication to others.
Titanic
The role played by Marconi Co. wireless in maritime rescues raised public awareness of the value of radio and brought fame to Marconi, particularly the sinking of RMS Titanic on 15 April 1912 and RMS Lusitania on 7 May 1915.[56]
RMS Titanic radio operators Jack Phillips and Harold Bride were not employed by the White Star Line but by the Marconi International Marine Communication Company. After the sinking of the ocean liner, survivors were rescued by the RMS Carpathia of the Cunard Line.[57]Carpathia took a total of 17 minutes to both receive and decode the SOS signal sent by Titanic. There was a distance of 58 miles between the two ships.[58] When Carpathia docked in New York, Marconi went aboard with a reporter from The New York Times to talk with Bride, the surviving operator.[57] After this incident, Marconi gained popularity and became more recognised for his contributions to the field of radio and wireless technology.[59]
On 18 June 1912, Marconi gave evidence to the Court of Inquiry into the loss of Titanic regarding the marine telegraphy's functions and the procedures for emergencies at sea.[60] Britain's Postmaster-General summed up, referring to the Titanic disaster: "Those who have been saved, have been saved through one man, Mr. Marconi ... and his marvellous invention."[61] Marconi was offered free passage on Titanic before she sank, but had taken Lusitania three days earlier. As his daughter Degna later explained, he had paperwork to do and preferred the public stenographer aboard that vessel.[62]
Continuing work
Share of the Marconi Wireless Telegraph Company of America, issued 20 August 1913
Over the years, the Marconi companies gained a reputation for being technically conservative, in particular by continuing to use inefficient spark-transmitter technology, which could be used only for radio-telegraph operations, long after it was apparent that the future of radio communication lay with continuous-wave transmissions which were more efficient and could be used for audio transmissions. Somewhat belatedly, the company did begin significant work with continuous-wave equipment beginning in 1915, after the introduction of the oscillating vacuum tube (valve). The New Street Works factory in Chelmsford was the location for the first entertainment radio broadcasts in the United Kingdom in 1920, employing a vacuum tube transmitter and featuring Dame Nellie Melba. In 1922, regular entertainment broadcasts commenced from the Marconi Research Centre at Great Baddow, forming the prelude to the BBC, and he spoke of the close association of aviation and wireless telephony in that same year at a private gathering with Florence Tyzack Parbury, and even spoke of interplanetary wireless communication. In 1924, the Marconi Company co-established the Unione Radiofonica Italiana (now RAI).[63]
Later years
Have I done the world good, or have I added a menace?[64]
While helping to develop microwave technology, the Marchese Marconi suffered nine heart attacks in the span of three years preceding his death.[66] Marconi died in Rome on 20 July 1937 at age 63, following the ninth, fatal, heart attack, and Italy held a state funeral for him. As a tribute, shops on the street where he lived were "Closed for national mourning".[67] In addition, at 6pm the next day, the time designated for the funeral, transmitters around the world observed two minutes of silence in his honour.[68] The British Post Office also sent a message requesting that all broadcasting ships honour Marconi with two minutes of broadcasting silence.[67] His remains are housed in the Mausoleum of Guglielmo Marconi in the grounds of Villa Griffone at Sasso Marconi, Emilia-Romagna, which assumed that name in his honour in 1938.[69]
In 1943, Marconi's elegant sailing yacht, the Elettra, was commandeered and refitted as a warship by the German Navy. She was sunk by the RAF on 22 January 1944. After the war, the Italian Government tried to retrieve the wreckage, to rebuild the boat, and the wreckage was removed to Italy. Eventually, the idea was abandoned, and the wreckage was cut into pieces which were distributed amongst Italian museums.
In 1943, the Supreme Court of the United States handed down a decision on Marconi's radio patents restoring some of the prior patents of Oliver Lodge, John Stone Stone, and Nikola Tesla.[70][71] The decision was not about Marconi's original radio patents[72] and the court declared that their decision had no bearing on Marconi's claim as the first to achieve radio transmission, just that since Marconi's claim to certain patents was questionable, he could not claim infringement on those same patents.[73] There are claims the high court was trying to nullify a World War I claim against the United States government by the Marconi Company via simply restoring the non-Marconi prior patent.[70]
Marconi was a friend of Charles van Raalte and his wife Florence, the owners of Brownsea Island; and of Margherita, their daughter, and in 1904 he met her Irish friend, The Hon. Beatrice O'Brien (1882–1976), a daughter of The 14th Baron Inchiquin. On 16 March 1905, Beatrice O'Brien and Marconi were married, and spent their honeymoon on Brownsea Island.[74] They had three daughters, Degna (1908–1998), Gioia (1916–1996), and Lucia (born and died 1906), and a son, Giulio, 2nd Marchese Marconi (1910–1971). In 1913, the Marconi family returned to Italy and became part of Rome society. Beatrice served as a lady-in-waiting to Queen Elena. At Marconi's request, his marriage to Beatrice was annulled on 27 April 1927, so he could remarry.[75] Marconi and Beatrice had divorced on 12 February 1924 in the free city of Fiume (Rijeka).[11]
Guglielmo and Beatrice Marconi c. 1910
On 12 June 1927 Marconi went on to marry Maria Cristina Bezzi-Scali (2 April 1900 – 15 July 1994), the only daughter of Francesco, Count Bezzi-Scali. To do this he had to be confirmed in the Catholic faith and became a devout member of the Church.[76] He was baptised Catholic but had been brought up as a member of the Anglican Church. On 12 June 1927, Marconi married Maria Cristina in a civil service, with a religious ceremony performed on 15 June. Marconi was 53 years old and Maria Cristina was 26. They had one daughter, Maria Elettra Elena Anna (born 1930), who married Prince Carlo Giovannelli (1942–2016) in 1966; they later divorced. For unexplained reasons, Marconi left his entire fortune to his second wife and their only child, and nothing to the children of his first marriage.[77]
Marconi wanted to personally introduce in 1931 the first radio broadcast of a Pope, Pius XI, and did announce at the microphone: "With the help of God, who places so many mysterious forces of nature at man's disposal, I have been able to prepare this instrument which will give to the faithful of the entire world the joy of listening to the voice of the Holy Father".[78]
In his lecture he stated: "I reclaim the honour of being the first fascist in the field of radiotelegraphy, the first who acknowledged the utility of joining the electric rays in a bundle, as Mussolini was the first in the political field who acknowledged the necessity of merging all the healthy energies of the country into a bundle, for the greater greatness of Italy".[81]
In 2002 researcher Annalisa Capristo found documents in the archives of Rome which showed that during his time as the President of the Royal Academy of Italy, Marconi had marked by hand Jewish applicants' records with an "E", where in the Italian language word for Jew is "Ebreo". Not one Jew was allowed to join during Marconi's tenure as president from 1930, three years before Adolf Hitler took power in Germany and eight years before Benito Mussolini's race laws brought his regime's antisemitism into the open. Following publication of Capristo's article "The Exclusion of Jews From the Academy of Italy" published in the Israel Monthly Review, historians were divided over whether the discrimination was the personal initiative of a scientist who considered Jews inferior or whether it was the action of a man too weak to oppose the regime's edicts.[82]
Legacy and honours
Archives
A large collection of Marconi artefacts was held by The General Electric Company, plc (GEC) of the United Kingdom which later renamed itself Marconi plc and Marconi Corporation plc. In December 2004 the extensive Marconi Collection, held at the former Marconi Research Centre at Great Baddow, Chelmsford, Essex UK was donated to the nation by the Company via the University of Oxford.[83] This consisted of the BAFTA award-winning MarconiCalling website, some 250+ physical artefacts and the massive ephemera collection of papers, books, patents and many other items. The artefacts are now held by The Museum of the History of Science and the ephemera Archives by the nearby Bodleian Library.[84] Following three years' work at the Bodleian, an Online Catalogue to the Marconi Archives was released in November 2008.
In 1988, the Radio Hall of Fame (Museum of Broadcast Communications, Chicago) inducted Marconi as a Pioneer (soon after the inception of its awards).[97]
In 1990, the Bank of Italy issued a Lire2,000 banknote featuring his portrait on the front and on the back his accomplishments.[98]
In 2001, Great Britain released a commemorative £2 coin celebrating the 100th anniversary of Marconi's first wireless communication.[99]
Marconi's early experiments in wireless telegraphy were the subject of two IEEE Milestones; one in Switzerland in 2003[100] and most recently in Italy in 2011.[101]
In 2009, Italy issued a commemorative silver 10 Euro coin honouring the centennial of Marconi's Nobel Prize.[102]
The Dutch radio academy bestows the Marconi Awards[nl] annually for outstanding radio programmes, presenters and stations.[104]
The National Association of Broadcasters (US) bestows the annual NAB Marconi Radio Awards also for outstanding radio programmes and stations.[105]
Tributes
Guglielmo Marconi Memorial in Washington, D.C. Bronze statue of Guglielmo Marconi, sculpted by Saleppichi Giancarlo erected 1975 Philadelphia, Pennsylvania
A granite obelisk stands on the cliff top near the site of Marconi's Marconi's Poldhu Wireless Station in Cornwall, commemorating the first transatlantic transmission.
Marconi Plaza Park, an urban park square named after the inventor in 1937, is located Philadelphia, Pennsylvania at Oregon Ave and South Broad Street. It includes a later 1975 bronze statue of Marconi erected on the east side.
Places and organisations named after Marconi
Outer space
The asteroid 1332 Marconia is named in his honour. A large crater on the far side of the moon is also named after him.
Europe
Italian 100 lire coin from 1974 commemorating the centenary of Marconi's birth.
The Marconi's Wireless Telegraph Company of Canada (now CMC Electronics and Ultra Electronics), of Montreal, Quebec, Canada, was created in 1903 by Guglielmo Marconi.[107] In 1925 the company was renamed to the 'Canadian Marconi Company', which was acquired by English Electric in 1953.[107] The company name changed again to CMC Electronics Inc. (French: CMC Électronique) in 2001. In 2002, the company historical radio business was sold to Ultra Electronics to become Ultra Electronics TCS Inc., now doing business as Ultra Communications. Both CMC Electronics and Ultra Communications are still located in Montreal.
The Marconi National Historic Sites of Canada was created by Parks Canada as a tribute to Marconi's vision in the development of radio telecommunications. The first official wireless message was sent from this location by the Atlantic Ocean to England in 1902. The museum site is located in Glace Bay, Nova Scotia, at Table Head on Timmerman Street.
New Brunswick Marconi Station, now the Guglielmo Marconi Memorial Plaza in Somerset, NJ. President Woodrow Wilson's Fourteen Points speech was transmitted from the site in 1918.
The Marconi Wireless Company of America, the world's first radio company, was incorporated in Roselle Park New Jersey, on West Westfield Avenue, on November 22, 1899.
British patent No. 12,039 (1897) "Improvements in Transmitting Electrical impulses and Signals, and in Apparatus therefor". Date of Application 2 June 1896; Complete Specification Left, 2 March 1897; Accepted, 2 July 1897 (later claimed by Oliver Lodge to contain his own ideas which he failed to patent).
British patent No. 7,777 (1900) "Improvements in Apparatus for Wireless Telegraphy". Date of Application 26 April 1900; Complete Specification Left, 25 February 1901; Accepted, 13 April 1901.
British patent No. 5113 (1904) "Improvements in Transmitters suitable for Wireless Telegraphy". Date of Application 1 March 1904; Complete Specification Left, 30 November 1904; Accepted, 19 January August 1905.
British patent No. 21640 (1904) "Improvements in Apparatus for Wireless Telegraphy". Date of Application 8 October 1904; Complete Specification Left, 6 July 1905; Accepted, 10 August 1905.
British patent No. 14788 (1904) "Improvements in or relating to Wireless Telegraphy". Date of Application 18 July 1905; Complete Specification Left, 23 January 1906; Accepted, 10 May 1906.
The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of broadcasting.
Wireless telegraphy or radiotelegraphy is transmission of text messages by radio waves, analogous to electrical telegraphy using cables. Before about 1910, the term wireless telegraphy was also used for other experimental technologies for transmitting telegraph signals without wires. In radiotelegraphy, information is transmitted by pulses of radio waves of two different lengths called "dots" and "dashes", which spell out text messages, usually in Morse code. In a manual system, the sending operator taps on a switch called a telegraph key which turns the transmitter on and off, producing the pulses of radio waves. At the receiver the pulses are audible in the receiver's speaker as beeps, which are translated back to text by an operator who knows Morse code.
Reginald Aubrey Fessenden was a Canadian-born inventor, who did a majority of his work in the United States and also claimed U.S. citizenship through his American-born father. During his life he received hundreds of patents in various fields, most notably ones related to radio and sonar.
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere. Since it is not limited by the curvature of the Earth, skywave propagation can be used to communicate beyond the horizon, at intercontinental distances. It is mostly used in the shortwave frequency bands.
The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the 20th century. Its use in radio was based on the 1890 findings of French physicist Édouard Branly and adapted by other physicists and inventors over the next ten years. The device consists of a tube or capsule containing two electrodes spaced a small distance apart with loose metal filings in the space between. When a radio frequency signal is applied to the device, the metal particles would cling together or "cohere", reducing the initial high resistance of the device, thereby allowing a much greater direct current to flow through it. In a receiver, the current would activate a bell, or a Morse paper tape recorder to make a record of the received signal. The metal filings in the coherer remained conductive after the signal (pulse) ended so that the coherer had to be "decohered" by tapping it with a clapper actuated by an electromagnet, each time a signal was received, thereby restoring the coherer to its original state. Coherers remained in widespread use until about 1907, when they were replaced by more sensitive electrolytic and crystal detectors.
Amos Emerson Dolbear was an American physicist and inventor. Dolbear researched electrical spark conversion into sound waves and electrical impulses. He was a professor at University of Kentucky in Lexington from 1868 until 1874. In 1874 he became the chair of the physics department at Tufts University in Medford, Massachusetts. He is known for his 1882 invention of a system for transmitting telegraph signals without wires. In 1899 his patent for it was purchased in an unsuccessful attempt to interfere with Guglielmo Marconi's wireless telegraphy patents in the United States.
A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. Spark-gap transmitters were the first type of radio transmitter, and were the main type used during the wireless telegraphy or "spark" era, the first three decades of radio, from 1887 to the end of World War I. German physicist Heinrich Hertz built the first experimental spark-gap transmitters in 1887, with which he proved the existence of radio waves and studied their properties.
John Stone Stone was an American mathematician, physicist and inventor. He initially worked in telephone research, followed by influential work developing early radio technology, where he was especially known for improvements in tuning. Despite his often advanced designs, the Stone Telegraph and Telephone Company failed in 1908, and he spent the remainder of his career as an engineering consultant.
The invention of radio communication was preceded by many decades of establishing theoretical underpinnings, discovery and experimental investigation of radio waves, and engineering and technical developments related to their transmission and detection. These developments allowed Guglielmo Marconi to turn radio waves into a wireless communication system.
The magnetic detector or Marconi magnetic detector, sometimes called the "Maggie", was an early radio wave detector used in some of the first radio receivers to receive Morse code messages during the wireless telegraphy era around the turn of the 20th century. Developed in 1902 by radio pioneer Guglielmo Marconi from a method invented in 1895 by New Zealand physicist Ernest Rutherford it was used in Marconi wireless stations until around 1912, when it was superseded by vacuum tubes. It was widely used on ships because of its reliability and insensitivity to vibration. A magnetic detector was part of the wireless apparatus in the radio room of the RMS Titanic which was used to summon help during its famous 15 April 1912 sinking.
The timeline of radio lists within the history of radio, the technology and events that produced instruments that use radio waves and activities that people undertook. Later, the history is dominated by programming and contents, which is closer to general history.
Arthur Moore was a Welsh wireless pioneer who became famous for hearing the distress signal from RMS Titanic before news of the disaster reached the UK. The self taught engineer built his first wireless set near his home in South Wales. When it became known of what he had done, the impressed Guglielmo Marconi gave Moore a job. He worked for Marconi Company his entire career in which he helped develop early radio.
Archie Frederick Collins, who generally went by A. Frederick Collins, was a prominent early American experimenter in wireless telephony and prolific author of books and articles covering a wide range of scientific and technical subjects. His reputation was tarnished in 1913 when he was convicted of mail fraud related to stock promotion. However, after serving a year in prison, he returned to writing, including, beginning in 1922, The Radio Amateur's Handbook, which continued to be updated and published until the mid-1980s.
Harry Shoemaker was an American inventor and pioneer radio engineer, who received more than 40 U.S. patents in the radio field from 1901 to 1905. His transmitter and receiver designs set the standard for the U. S. commercial radio industry up to World War One.
The World Wireless System was a turn of the 20th century proposed telecommunications and electrical power delivery system designed by inventor Nikola Tesla based on his theories of using Earth and its atmosphere as electrical conductors. He claimed this system would allow for "the transmission of electric energy without wires" on a global scale as well as point-to-point wireless telecommunications and broadcasting. He made public statements citing two related methods to accomplish this from the mid-1890s on. By the end of 1900 he had convinced banker J. P. Morgan to finance construction of a wireless station based on his ideas intended to transmit messages across the Atlantic to England and to ships at sea. His decision to change the design to include wireless power transmission to better compete with Guglielmo Marconi's new radio based telegraph system was met with Morgan's refusal to fund the changes. The project was abandoned in 1906, never to become operational.
The following timeline tables list the discoveries and inventions in the history of electrical and electronic engineering.
Eugène Adrien Ducretet was a French scientific instrument manufacturer, who performed some of the first experiments on wireless telegraphy in France. His father, Louis Joseph Ducretet, was a Savoy textiles merchant who moved to Paris. He never completed a formal education, leaving primary school at age 15. After several years apprenticed to Paris engineer Paul-Gustav Froment, Ducretet opened his own workshop in 1864 at 21 Rue des Ursulines where with a few employees he manufactured classical physics research, teaching and demonstration apparatus, such as galvanometers, Wimshurst machines, and Crookes tubes. Over time his reputation grew and he became instrument supplier to several large Paris educational and scientific institutions. He was awarded a gold medal for his quality instruments at the 1878 Paris Universal Exposition and from then on his firm was a regular presence at important international expositions, winning another gold at the 1881 International Electricity Exposition in Paris. He was made a Knight of the Legion of Honour in 1885.
The Marconi Wireless Telegraph Company of America was incorporated in 1899. It was established as a subsidiary of the British Marconi Company and held the U.S. and Cuban rights to Guglielmo Marconi's radio patents. American Marconi initially primarily operated high-powered land and transatlantic shipboard stations. In 1912, it acquired the extensive assets of the bankrupt United Wireless Telegraph Company, becoming the dominant radio communications provider in the United States.
Elettra was the name of Guglielmo Marconi's steam yacht – a seaborne laboratory – from which he conducted his many experiments with wireless telegraphy, wireless telephony and other communication and direction-finding techniques during the inter-war period.
↑ Gavin Weightman, The Industrial Revolutionaries: The Making of the Modern World 1776–1914, Grove/Atlantic, Inc. – 2010, page 357
↑ Bondyopadhyay, Prebir K. (1995). "Guglielmo Marconi – The father of long distance radio communication – An engineer's tribute". 25th European Microwave Conference, 1995. p.879. doi:10.1109/EUMA.1995.337090. S2CID6928472.
↑ Alfonso, not Guglielmo, was a pupil at Bedford School: 'It is not generally known that the Marconi family at one time lived in Bedford, in the house on Bromham Road on the western corner of Ashburnham Road, and that the elder brother of the renowned Marchese Marconi attended this School for four years.' The Ousel, June 1936, p. 78. From Alfonso's obituary.
↑ Bedfordshire Times. 23 July 1937, p. 9 (Marconi's obituary)
↑ BBC Wales, "Marconi's Waves". Archived from the original on 20 January 2007. Retrieved 20 January 2007.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
1 2 Eaton, John P. and Haas, Charles A. (1994) Titanic – Triumph and Tragedy, A Chronicle in Words and Pictures. ISBN0857330241.
↑ "Marconi: The Man Who Networked the World | CBC Radio." CBCnews, CBC/Radio Canada, 10 Nov. 2016, www.cbc.ca/radio/ideas/marconi-the-man-who-networked-the-world-1.3845164.
↑ RMS Titanic, Inc. "Recovery Expedition to Titanic Sets Target Departure Date for 2021." PR Newswire: News Distribution, Targeting and Monitoring, 22 July 2020,
Marconi, Degna, My Father, Marconi, James Lorimer & Co, 1982. ISBN0-919511-14-7 (Italian version): Marconi, mio padre, Di Renzo Editore, 2008, ISBN88-8323-206-2
Marconi's Wireless Telegraph Company, Year book of wireless telegraphy and telephony, London: Published for the Marconi Press Agency Ltd., by the St. Catherine Press / Wireless Press. LCCN 14017875 sn 86035439
Ahern, Steve (ed), Making Radio (2nd Edition) Allen & Unwin, Sydney, 2006 ISBN9781741149128.
Aitken, Hugh G. J., Syntony and Spark: The Origins of Radio, New York: John Wiley & Sons, 1976. ISBN0-471-01816-3
Aitken, Hugh G. J., The Continuous Wave: Technology and American Radio, 1900–1932, Princeton, New Jersey: Princeton University Press, 1985. ISBN0-691-08376-2.
Baker, W. J., A History of the Marconi Company, 1970.
Brodsky, Ira. The History of Wireless: How Creative Minds Produced Technology for the Masses (Telescope Books, 2008)
Cheney, Margaret, Tesla: Man Out of Time Laurel Publishing, 1981. Chapter 7, esp pp 69, re: published lectures of Tesla in 1893, copied by Marconi.
Clark, Paddy, "Marconi's Irish Connections Recalled," published in 100 Years of Radio, IEE Conference Publication 411, 1995.
Coe, Douglas and Kreigh Collins (ills), Marconi, pioneer of radio, New York, J. Messner, Inc., 1943. LCCN 43010048
Garratt, G. R. M., The early history of radio: from Faraday to Marconi, London, Institution of Electrical Engineers in association with the Science Museum, History of technology series, 1994. ISBN0-85296-845-0 LCCN gb 94011611
Geddes, Keith, Guglielmo Marconi, 1874–1937, London: H.M.S.O., A Science Museum booklet, 1974. ISBN0-11-290198-0 LCCN 75329825 (ed. Obtainable in the United States. from Pendragon House Inc., Palo Alto, California.)
Hancock, Harry Edgar, Wireless at sea; the first fifty years: A history of the progress and development of marine wireless communications written to commemorate the jubilee of the Marconi International Marine Communication Company, Limited, Chelmsford, Eng., Marconi International Marine Communication Co., 1950. LCCN 51040529 /L
Homer, Peter and O'Connor, Finbar, Marconi Wireless Radio Station: Malin Head from 1902, 2014.
Janniello, Maria Grace, Monteleone, Franco and Paoloni, Giovanni (eds) (1996), One hundred years of radio: From Marconi to the future of the telecommunications. Catalogue of the extension, Venice: Marsilio.
Jolly, W. P., Marconi, 1972.
Larson, Erik, Thunderstruck, New York: Crown Publishers, 2006. ISBN1-4000-8066-5 A comparison of the lives of Hawley Harvey Crippen and Marconi. Crippen was a murderer whose Transatlantic escape was foiled by the new invention of shipboard radio.
MacLeod, Mary K., Marconi: The Canada Years – 1902–1946, Halifax, Nova Scotia: Nimbus Publishing Limited, 1992, ISBN1551093308
Masini, Giancarlo, Guglielmo Marconi, Turin: Turinese typographical-publishing union, 1975. LCCN 77472455 (ed. Contains 32 tables outside of the text)
Mason, H. B. (1908). Encyclopaedia of ships and shipping, Wireless Telegraphy. London: Shipping Encyclopaedia. 1908.
Paul M. Hawkins - "Point to Point - A History of International Telecommunications During the Radio Years" ISBN 978-178719-6278 pub. by New Generation Publishing.
Paul M. Hawkins & Paul G. Reyland - "Marconi's Wireless Telegraph Stations in Essex - The Centenary of Brentwood and Ongar Radio Stations" ISBN 978-180369-3828 by - pub.2022 by New Generation Publishing.
Weightman, Gavin, Signor Marconi's magic box: the most remarkable invention of the 19th century & the amateur inventor whose genius sparked a revolution, 1st Da Capo Press ed., Cambridge, MA: Da Capo Press, 2003. ISBN0-306-81275-4
Winkler, Jonathan Reed. Nexus: Strategic Communications and American Security in World War I. (Cambridge, MA: Harvard University Press, 2008). Account of rivalry between Marconi's firm and the United States government during World War I.
Robert (Bob) White, Guglielmo Marconi – Aerial Assistance with a Kite. Bridging the Atlantic By Wireless Signal – 12 December 1901. Kiting, The Journal of the American Kitefliers Association. Vol. 23, Issue 5 – Winter 2002. November 2001
This page is based on this Wikipedia article Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.
