Guglielmo Giovanni Maria Marconi
25 April 1874
Palazzo Marescalchi, Bologna, Italy
|Died||20 July 1937 (aged 63)|
|Alma mater||University of Bologna|
|Academic advisors||Augusto Righi|
Guglielmo Giovanni Maria Marconi, 1st Marquis of Marconi FRSA (Italian: [ɡuʎˈʎɛlmo marˈkoːni]; 25 April 1874 – 20 July 1937) was an Italian inventor and electrical engineer, known for his pioneering work on long-distance radio transmission, development of Marconi's law, and a radio telegraph system. He is credited as the inventor of radio, and he shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy".
Marconi was also an entrepreneur, businessman, and founder of The Wireless Telegraph & Signal Company in the United Kingdom in 1897 (which became the Marconi Company). He succeeded in making an engineering and commercial success of radio by innovating and building on the work of previous experimenters and physicists. In 1929, Marconi was ennobled as a Marchese (marquis) by King Victor Emmanuel III of Italy, and, in 1931, he set up the Vatican Radio for Pope Pius XI.
Marconi was born into the Italian nobility as Guglielmo Giovanni Maria Marconi 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). Marconi had a brother, Alfonso, and a stepbrother, Luigi. Between the ages of two and six, Marconi and his elder brother Alfonso lived with their mother in the English town of Bedford.
Marconi did not attend school as a child and did not go on to formal higher education. Instead, he learned chemistry, math, 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. Marconi noted an important mentor was professor Vincenzo Rosa, a high school physics teacher in Livorno. 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.
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. At the time, this radiation was commonly called "Hertzian" waves, and is now generally referred to as radio waves.
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. 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, a line of inquiry that Marconi noted other inventors did not seem to be pursuing.
Developing radio telegraphy
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 Edouard Branly and used in Lodge's experiments, that changed resistance when exposed to radio waves. 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. 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, turning what was essentially a laboratory experiment into a useful communication system. Marconi came up with a functional system with many components:
- A relatively simple oscillator or spark-producing radio transmitter;
- A wire or metal sheet capacity area suspended at a height above the ground;
- A coherer receiver, which was a modification of Edouard 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.
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, grounding his transmitter and receiver. With these improvements, the system was capable of transmitting signals up to 2 miles (3.2 km) and over hills. 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.
Marconi wrote to the Ministry of Post and Telegraphs, then under the direction of Pietro Lacava, explaining his wireless telegraph machine and asking for funding. He never received a response to his letter, which was eventually dismissed by the Minister, who wrote "to the Longara" on the document, referring to the insane asylum on Via della Lungara in Rome.
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 England. 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 England 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 British Post Office. 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 base communication system.
The British become interested
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Marconi made the first demonstration of his system for the British government in July 1896. 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 (3.7 mi) 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 in Penarth, a distance of 6 kilometres (3.7 mi). The message read "Are you ready". The transmitting equipment was almost immediately relocated to Brean Down Fort on the Somerset coast, stretching the range to 16 kilometres (9.9 mi).
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.
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 Lloyds between Ballycastle and Rathlin Island, Northern Ireland, was conducted on 6 July 1898. 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 sailing boat, the Elettra, was often moored on Brownsea or at the Haven Hotel when he was not conducting experiments at sea.
In December 1898, the British lightship service authorized 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 SOS message, 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.
In the autumn of 1899, the first demonstrations 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. Marconi left for England on 8 November 1899 on the American Line's SS Saint Paul, and he and his assistants installed wireless equipment aboard during the voyage. On 15 November 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.
At the turn of the 20th century, Marconi began investigating a means to signal across the Atlantic in order to compete with the transatlantic telegraph cables. Marconi established a wireless transmitting station at Marconi House, Rosslare Strand, Co. Wexford in 1901 to act as a link between Poldhu in Cornwall, England and Clifden in Co. 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 (150 m) 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 (3,500 km). 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 ≈ 850 kHz). 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.
Feeling challenged by skeptics, 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 (2,490 km), and audio reception up to 2,100 miles (3,400 km). 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 (1,100 km), 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, 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.
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 between Clifden, Ireland and Glace Bay, but even after this the company struggled for many years to provide reliable communication to others.
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 the RMS Titanic on 15 April 1912 and the RMS Lusitania on 7 May 1915.
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 on 15 April 1912, survivors were rescued by the RMS Carpathia of the Cunard Line. Also employed by the Marconi Company was David Sarnoff, who later headed RCA. Wireless communications were reportedly maintained for 72 hours between Carpathia and Sarnoff, but Sarnoff's involvement has been questioned by some modern historians. When Carpathia docked in New York, Marconi went aboard with a reporter from The New York Times to talk with Bride, the surviving operator.
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. 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." 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.
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 1914, Marconi was made a Senator in the Senate of the Kingdom of Italy and appointed Honorary Knight Grand Cross of the Royal Victorian Order in the UK. During World War I, Italy joined the Allied side of the conflict, and Marconi was placed in charge of the Italian military's radio service. He attained the rank of lieutenant in the Royal Italian Army and of commander in the Regia Marina. In 1929, he was made a marquess by King Victor Emmanuel III.
Marconi joined the Italian Fascist party in 1923. In 1930, Italian dictator Benito Mussolini appointed him President of the Royal Academy of Italy, which made Marconi a member of the Fascist Grand Council.
While helping to develop microwave technology, Marconi suffered nine heart attacks in the span of 3 years preceding his death. 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". In addition, at 6 pm the next day, the time designated for the funeral, all BBC transmitters and wireless Post Office transmitters in the British Isles observed two minutes of silence in his honour. The British Post Office also sent a message requesting that all broadcasting ships honour Marconi with two minutes of broadcasting silence as well. His remains are housed in the Villa Griffone at Sasso Marconi, Emilia-Romagna, which assumed that name in his honour in 1938.
In 1943, Marconi's elegant sailing yacht, the Elettra, was commandeered and re-fitted 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. The decision was not about Marconi's original radio patents 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 were questionable, he could not claim infringement on those same patents. 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.
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 friend, 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. 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 Marconis 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. Marconi and Beatrice had divorced on 12 February 1924 in the free city of Fiume (Rijeka).
Marconi went on to marry Maria Cristina Bezzi-Scali (1900–1994), 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. 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. 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.
In his lecture he stated: «I reclaim the honor 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».
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".
Legacy and honours
Honours and awards
- In 1902 he was appointed a Grand Officer of the Order of the Crown of Italy
- In 1909, Marconi shared the Nobel Prize in Physics with Karl Braun for his contributions to radio communications.
- In 1914 named senator by the king of Italy Vittorio Emanuele III
- In 1918, he was awarded the Franklin Institute's Franklin Medal.
- In 1920, he was awarded the IRE Medal of Honor, now the IEEE Medal of Honor.
- In 1929, he was made a marquess by King Victor Emmanuel III, thus becoming Marchese Marconi.
- In 1931, he was awarded with John Scott Medal by wireless telegraphy
- In 1933, he was awarded Order of the Rising Sun.
- In 1934, he was awarded the Wilhelm Exner Medal.
- In 1975, Marconi was inducted into the National Inventors Hall of Fame.
- In 1977, Marconi was inducted into the National Broadcasters Hall of Fame.
- In 1988, the Radio Hall of Fame (Museum of Broadcast Communications, Chicago) inducted Marconi as a Pioneer (soon after the inception of its awards).
- In 1990, the Bank of Italy issued a 2,000 lire banknote featuring his portrait on the front and on the back his accomplishments.
- In 2001, Great Britain released a commemorative British two pound coin celebrating the 100th anniversary of Marconi's first wireless communication.
- Marconi's early experiments in wireless telegraphy were the subject of two IEEE Milestones; one in Switzerland in 2003 and most recently in Italy in 2011.
- In 2009, Italy issued a commemorative silver €5 coin honouring the centennial of Marconi's Nobel Prize.
- In 2009, he was inducted into the New Jersey Hall of Fame.
- The Dutch radio academy bestows the Marconi Awards annually for outstanding radio programmes, presenters and stations.
- The National Association of Broadcasters (US) bestows the annual NAB Marconi Radio Awards also for outstanding radio programs and stations.
- A funerary monument to the effigy of Marconi can be seen in the Basilica of Santa Croce, Florence but his remains are in near the Mausoleum of Guglielmo Marconi in Pontecchio Marconi, near Bologna. His former villa, adjacent to the mausoleum is the Marconi Museum (Italy) with much of his equipment.
- A statue of Guglielmo Marconi stands in Church Square Park in Hoboken, NJ.
- A Guglielmo Marconi sculpture by Attilio Piccirilli stands in Washington, D.C.
- A large collection of Marconi artefacts was held by The General Electric Company, p.l.c. (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. 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. Following three years' work at the Bodleian, an Online Catalogue to the Marconi Archives was released in November 2008.
- 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.
- An urban park square named in 1937 located Philadelphia, Pennsylvania at Oregon Ave and South Broad Street, including later in 1975 a bronze statue erected of Marconi on the east side of Marconi Plaza Park.
Places and organisations named after Marconi
- Bologna Guglielmo Marconi Airport (IATA: BLQ – ICAO: LIPE), of Bologna, is named after Marconi, its native son.
- Open University Guglielmo Marconi in Rome, Italy (Università Telematica "Guglielmo Marconi")
- Ponte Guglielmo Marconi, bridge that connects Piazza Augusto Righi with Piazza Tommaso Edison, in Rome
- Department of Electrical, Electronic and Information Engineering "Guglielmo Marconi" (DEI), Università di Bologna
- The street Marconigatan in Frölunda in Gothenburg.
- Australian football (soccer) and social club Marconi Stallions.
- The 'Marconi's Wireless Telegraph Company of Canada' (now CMC Electronics, of Montreal, Quebec, Canada, was created in 1903 by Guglielmo Marconi. In 1925 the company was renamed to the 'Canadian Marconi Company', which was acquired by English Electric in 1953. The company name changed again to CMC Electronics Inc. (French: CMC Électronique) in 2001.
- 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.
As of 2016 the Canadian Marconi Company and CMC Electronics no longer exist. Most bought up by Esterline in Ottawa. The Marine Service Group was acquired by MacKay Marine but many of the employees left the group at transition.
- Marconi Conference Center and State Historic Park, site of the transoceanic Marshall Receiving Station, Marshall.
- Marconi Wireless Telegraphy Station on Oahu's North Shore, briefly the world's most powerful telegraph station.
- Marconi Beach in Wellfleet, Massachusetts, part of the Cape Cod National Seashore, located near the site of his first transatlantic wireless signal from the United States to Britain. There are still remnants of the wireless tower at this beach and at Forest Road Beach in Chatham, Massachusetts.
- 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.
- Belmar Marconi Station, now the InfoAge Science History Center in Wall Township, NJ.
- Marconi Plaza, Philadelphia, Pennsylvania. Roman terrace-styled plaza originally designed by the architects Olmsted Brothers in 1914–1916, built as the grand entrance for the 1926 Sesquicentennial Exposition and renamed to honor Marconi.
- 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. 10245 (1902)
- 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.
- U.S. Patent 586,193 "Transmitting electrical signals", (using Ruhmkorff coil and Morse code key) filed December 1896, patented July 1897
- U.S. Patent 624,516 "Apparatus employed in wireless telegraphy".
- U.S. Patent 627,650 "Apparatus employed in wireless telegraphy".
- U.S. Patent 647,007 "Apparatus employed in wireless telegraphy".
- U.S. Patent 647,008 "Apparatus employed in wireless telegraphy".
- U.S. Patent 647,009 "Apparatus employed in wireless telegraphy".
- U.S. Patent 650,109 "Apparatus employed in wireless telegraphy".
- U.S. Patent 650,110 "Apparatus employed in wireless telegraphy".
- U.S. Patent 668,315 "Receiver for electrical oscillations".
- U.S. Patent 676,332 "Apparatus for wireless telegraphy" (later practical version of system)
- U.S. Patent 757,559 "Wireless telegraphy system". Filed 19 November 1901; Issued 19 April 1904.
- U.S. Patent 760,463 "Wireless signaling system". Filed 10 September 1903; Issued 24 May 1904.
- U.S. Patent 763,772 "Apparatus for wireless telegraphy" (Four tuned system; this innovation was predated by N. Tesla, O. Lodge, and J. S. Stone)
- U.S. Patent 786,132 "Wireless telegraphy". Filed 13 October 1903
- U.S. Patent 792,528 "Wireless telegraphy". Filed 13 October 1903; Issued 13 June 1905.
- U.S. Patent 884,986 "Wireless telegraphy". Filed 28 November 1902; Issued 14 April 1908.
- U.S. Patent 884,987 "Wireless telegraphy".
- U.S. Patent 884,988 "Detecting electrical oscillations". Filed 2 February 1903; Issued 14 April 1908.
- U.S. Patent 884,989 "Wireless telegraphy". Filed 2 February 1903; Issued 14 April 1908.
- U.S. Patent 924,560 "Wireless signaling system". Filed 9 August 1906; Issued 8 June 1909.
- U.S. Patent 935,381 "Transmitting apparatus for wireless telegraphy". Filed 10 April 1908; Issued 28 September 1909.
- U.S. Patent 935,382 "Apparatus for wireless telegraphy".
- U.S. Patent 935,383 "Apparatus for wireless telegraphy". Filed 10 April 1908; Issued 28 September 1909.
- U.S. Patent 954,640 "Apparatus for wireless telegraphy". Filed 31 March 1909; Issued 12 April 1910.
- U.S. Patent 997,308 "Transmitting apparatus for wireless telegraphy". Filed 15 July 1910; Issued 11 July 1911.
- U.S. Patent 1,102,990 "Means for generating alternating electric currents". Filed 27 January 1914; Issued 7 July 1914.
- U.S. Patent 1,226,099 "Transmitting apparatus for use in wireless telegraphy and telephony". Filed 31 December 1913; Issued 15 May 1917.
- U.S. Patent 1,271,190 "Wireless telegraph transmitter".
- U.S. Patent 1,377,722 "Electric accumulator". Filed 9 March 1918
- U.S. Patent 1,148,521 "Transmitter for wireless telegraphy". Filed 20 July 1908; Issued 3 August 1915.
- U.S. Patent 1,981,058 "Thermionic valve". Filed 14 October 1926; Issued 20 November 1934.
- U.S. Patent RE11,913 "Transmitting electrical impulses and signals and in apparatus, there-for". Filed 1 April 1901; Issued 4 June 1901.
- History of radio
- Jagadish Chandra Bose
- List of people on stamps of Ireland
- List of covers of Time magazine during the 1920s – 6 December 1926
- 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.
- Hong, p. 1
- "Guglielmo Marconi: The Nobel Prize in Physics 1909". nobelprize.org
- Bondyopadhyay, P.K. (1998). "Sir J.C. Bose diode detector received Marconi's first transatlantic wireless signal of December 1901 (the 'Italian Navy Coherer' Scandal Revisited)". Proceedings of the IEEE. 86: 259. doi:10.1109/5.658778.
- Roy, Amit (8 December 2008). "Cambridge 'pioneer' honour for Bose". The Telegraph. Kolkota. Retrieved 10 June 2010.
- Icons of Invention: The Makers of the Modern World from Gutenberg to Gates. ABC-CLIO. 2009. p. 162. ISBN 978-0-313-34743-6.
- Mulvihill, Mary (2003). Ingenious Ireland: A County-by-County Exploration of the Mysteries and Marvels of the Ingenious Irish. Simon and Schuster. p. 313. ISBN 978-0-684-02094-5.
- Atti della Accademia di scienze, lettere e arti di Palermo: Scienze, Presso l'accademia, 1974, p. 11.
- Sexton, Michael (2005) Marconi: the Irish connection. Four Courts Press.
- 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)
- McHenry, Robert, ed. (1993). "Guglielmo Marconi". Encyclopædia Britannica.
- The Marconi Society, book synopsis - Marc Raboy, The Discovery that Continues to Change the World
- Dunlap, Orrin Elmer, Marconi, the man and his wireless, Macmillan - 1937, page 10
- Guglielmo Marconi Foundation, Profiles, Vincenzo Rosa
- Guglielmo Marconi (Fabrizio Bònoli, Giorgio Dragoni). Scienzagiovane.unibo.it. Retrieved on 10 June 2016.
- "22. Word Origins". earlyradiohistory.us.
- Regal, Brian (2005) Radio: The Life Story of a Technology. Greenwood Publishing Group. p. 22. ISBN 0313331677
- Hong, p. 19
- Brown, Antony. Great Ideas in Communications. D. White Co., 1969, page 141
- Guglielmo Marconi, padre della radio. Radiomarconi.com. Retrieved on 12 July 2012.
- Hong, p. 22
- Marconi delineated his 1895 apparatus in his Nobel Award speech. See: Marconi, "Wireless Telegraphic Communication: Nobel Lecture, 11 December 1909." Nobel Lectures. Physics 1901–1921. Amsterdam: Elsevier Publishing Company, 1967: 196–222. p. 198.
- Hong, p. 6
- Hong, pp. 20–22
- Marconi, "Wireless Telegraphic Communication: Nobel Lecture, 11 December 1909." Nobel Lectures. Physics 1901–1921. Amsterdam: Elsevier Publishing Company, 1967: 196–222. p. 206.
- The Saturday review of politics, literature, science and art, Volume 93. "THE INVENTOR OF WIRELESS TELEGRAPHY: A REPLY. To the Editor of the Saturday Review" Guglielmo Marconi and "WIRELESS TELEGRAPHY: A REJOINDER. To the Editor of the Saturday Review," Silvanus P. Thompson.
- Gualandi, Lodovico (26 June 2000). "MARCONI E LO STRAVOLGIMENTO DELLA VERITÀ STORICA SULLA SUA OPERA". radiomarconi.com.
- Proceedings of the Institution of Electrical Engineers, Volume 28 By Institution of Electrical Engineers. p. 294.
- Solari, Luigi (February 1948) "Guglielmo Marconi e la Marina Militare Italiana", Rivista Marittima
- Guglielmo Marconi, seas.columbia.edu
- "Flickr Photo".
- BBC Wales, "Marconi's Waves". Archived from the original on 20 January 2007. Retrieved 20 January 2007.CS1 maint: BOT: original-url status unknown (link)
- "Marconi's Wireless Telegraph by Cleveland Moffett, McClure's Magazine, June 1899, pages 99-112.
- The first-ever radio distress call is made off Kent coast
- Helgesen, Henry N. "Wireless Goes to Sea: Marconi's Radio and SS Ponce". Sea History (Spring 2008): 122.
- First Atlantic Ocean crossing by a wireless signal Archived 30 January 2013 at the Wayback Machine. Carnetdevol.org. Retrieved on 12 July 2012.
- "Marconi and the History of Radio". IEEE Antennas and Propagation Magazine. 46 (2): 130. 2004. doi:10.1109/MAP.2004.1305565.
- Belrose, John S. (5 September 1995) "Fessenden and Marconi: Their Differing Technologies and Transatlantic Experiments During the First Decade of this Century". International Conference on 100 Years of Radio.
- "The Clifden Station of the Marconi Wireless Telegraph System". Scientific American. 23 November 1907.
- Second Test of the Marconi Over-Ocean Wireless System Proved Entirely Successful. Sydney Daily Post. 24 October 1907.
- Eaton, John P. and Haas, Charles A. (1994) Titanic – Triumph and Tragedy, A Chronicle in Words and Pictures. ISBN 0857330241.
- Herron, Edward A. (1969). Miracle of the Air Waves: A History of Radio. Messner. ISBN 0-671-32079-3.
- Court of Inquiry Loss of the S.S. Titanic 1912
- "Titanic's Wireless Connection". Wireless History Foundation. April 2012. Retrieved 7 October 2013.
- Daugherty, Greg (March 2012). "Seven Famous People Who Missed the Titanic". Smithsonian Magazine.
- William John (1972) History Of The Marconi Company 1874–1965. p. 296
- Firstenberg, Arthur (2017). The Invisible Rainbow. AGB Press. p. 99. ISBN 978-0-692-68301-9.
- "Radio falls silent for death of Marconi". Theguardian.com. Retrieved on 10 June 2016.
- VILLA GRIFFONE, NEAR BOLOGNA, ITALY. markpadfield.com
- Redouté, Jean-Michel; Steyaert, Michiel (2009). EMC of Analog Integrated Circuits. Springer Science & Business Media. p. 3. ISBN 978-90-481-3230-0.
- Meadow, Charles T. (2002). Making Connections: Communication through the Ages. Scarecrow Press. p. 193. ISBN 978-1-4617-0691-5.
- White, Thomas H. (1 November 2012). "Nikola Tesla: The Guy Who DIDN'T "Invent Radio". Earlyradiohistory.us.
- Sobot, Robert (2012). Wireless Communication Electronics: Introduction to RF Circuits and Design Techniques. Springer Science & Business Media. p. 4. ISBN 978-1-4614-1116-1.
- Padfield, Mark. "Beatrice O'Brien". Marconi Calling. Archived from the original on 24 June 2013. Retrieved 24 May 2013.
- Marconi, Degna (2001) My Father, Marconi. Guernica Editions. pp. 218–227. ISBN 1550711512.
- Marconi, Maria Cristina (2001) Marconi My Beloved. Branden Books. pp. 19–24. ISBN 978-0-937832-39-4.
- Degna Marconi (2001), My Father, Marconi (Guernica Editions), p. 232. ISBN 1550711512.
- Physicsworld.com, "Guglielmo Marconi: radio star", 2001 Archived 14 July 2007 at the Wayback Machine
- The New York Times, August 29, 1935, Page 2. https://www.nytimes.com/1935/08/29/archives/marconi-to-join-italian-forces-in-ethiopia-likely-to-direct.html
- Franco Monteleone, La radio italiana nel periodo fascista: studio e documenti, 1922-1945, Marsilio Editore, 1976, p. 44.
- "80 Years of Vatican Radio, Pope Pius XI and Marconi. .. and Father Jozef Murgas?". Saint Benedict Center.
- "Signor Marconi". The Times (36878). London. 20 September 1902. p. 5.
- Marconi: The Man Who Networked the World.
- National Broadcasters Hall of Fame. Archived 3 July 2014 at the Wayback Machine Accessed 10 February 2009
- "Pioneer: Guglielmo Marconi". radiohof.org. Archived from the original on 5 May 2012. Retrieved 30 May 2012.
- Italy 2,000 lira banknote (1990) Banknote Museum (banknote.ws). Retrieved on 17 March 2013.
- "Milestones:Marconi's Early Wireless Experiments, 1895". IEEE Global History Network. IEEE. Retrieved 29 July 2011.
- "List of IEEE Milestones". IEEE Global History Network. IEEE. Retrieved 29 July 2011.
- New Jersey to Bon Jovi: You Give Us a Good Name. accesshollywood.com (2 February 2009).
- UK | England | Berkshire | Marconi archives move to Oxford. BBC News (6 December 2004). Retrieved on 10 June 2016.
- Catalogue of the Marconi Archive now available online. bodleian.ox.ac.uk (7 November 2008)
- "CMC Electronics' Profile". CMC Electronics Inc. Archived from the original on 24 September 2006. Retrieved 12 January 2007.
- Honolulu Star-bulletin. 24 Sept. 1914. Chronicling America: Historic American Newspapers. Lib. of Congress.
- "Chatham Marconi Maritime Center". www.arrl.org. Retrieved 9 November 2015.
- Hong, Sungook (2001). Wireless: From Marconi's Black-Box to the Audion (PDF). Cambridge, Mass.: MIT Press. ISBN 0-262-08298-5.
- Relatives and company publications
- Bussey, Gordon, Marconi's Atlantic Leap, Marconi Communications, 2000. ISBN 0-9538967-0-6
- Isted, G.A., Guglielmo Marconi and the History of Radio – Part I, General Electric Company, p.l.c., GEC Review, Volume 7, No. 1, p45, 1991, ISSN 0267-9337
- Isted, G.A., Guglielmo Marconi and the History of Radio – Part II, General Electric Company, p.l.c., GEC Review, Volume 7, No. 2, p110, 1991, ISSN 0267-9337
- Marconi, Degna, My Father, Marconi, James Lorimer & Co, 1982. ISBN 0-919511-14-7 (Italian version): Marconi, mio padre, Di Renzo Editore, 2008, ISBN 88-8323-206-2
- 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
- Simons, R.W., Guglielmo Marconi and Early Systems of Wireless Communication, General Electric Company, p.l.c., GEC Review, Volume 11, No. 1, p37, 1996, ISSN 0267-9337
- Ahern, Steve (ed), Making Radio (2nd Edition) Allen & Unwin, Sydney, 2006 ISBN 9781741149128.
- Aitken, Hugh G. J., Syntony and Spark: The Origins of Radio, New York: John Wiley & Sons, 1976. ISBN 0-471-01816-3
- Aitken, Hugh G. J., The Continuous Wave: Technology and American Radio, 1900–1932, Princeton, New Jersey: Princeton University Press, 1985. ISBN 0-691-08376-2.
- Anderson, Leland I., Priority in the Invention of Radio – Tesla vs. Marconi
- 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. ISBN 0-85296-845-0 LCCN gb 94011611
- Geddes, Keith, Guglielmo Marconi, 1874–1937, London : H.M.S.O., A Science Museum booklet, 1974. ISBN 0-11-290198-0 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
- Hughes, Michael and Bosworth, Katherine, Titanic Calling : Wireless Communications During the Great Disaster, Oxford, The Bodleian Library, 2012, ISBN 978-1-85124-377-8
- 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. ISBN 1-4000-8066-5 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, ISBN 1551093308
- 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.
- Perry, Lawrence (1902). "Commercial Wireless Telegraphy". The World's Work: A History of Our Time. V: 3194–3201. Retrieved 10 July 2009.
- Stone, Ellery W., Elements of Radiotelegraphy
- 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. ISBN 0-306-81275-4
- 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.
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- Encyclopædia Britannica (12th ed.). 1922. .
- General achievements
- Nobel Prize: Guglielmo Marconi biography
- Marconi il 5 marzo 1896, presenta a Londra la prima richiesta provvisoria di brevetto, col numero 5028 e col titolo "Miglioramenti nella telegrafia e relativi apparati" (Great Britain and France between 1896 and 1924)
- List of British and French patents (1896–1924) The first patent application number 5028 of 5 March 1896 (Provisional deprivation)
- Foundations and academics
- University of Oxford Introduction to the Online Catalogue of the Marconi Collection
- University of Oxford Online Catalogue of the Marconi Archives
- Guglielmo Marconi Foundation, Pontecchio Marconi, Bologna, Italy
- Galileo Legacy Foundation: pictures of the Dedication of the Guglielmo Marconi Square, Johnston RI United States Dedication Photos
- History of Marconi House, Marconi House, Strand / Aldwych, London.
- Multimedia and books
- MarconiCalling – The Life, Science and Achievements of Guglielmo Marconi, part of the Marconi Collection at the University of Oxford
- Canadian Heritage Minute featuring Marconi
- Guglielmo Marconi documentary, narrated by Walter Cronkite
- Review of Signor Marconi's Magic Box
- Newspaper clippings about Guglielmo Marconi in the 20th Century Press Archives of the ZBW
- Transatlantic "signals" and radio
- 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
- Faking the Waves, 1901
- Marconi and "wireless telegraphy" using kites
- Keys and "signals"
- Sparks Telegraph Key Review An exhaustive listing of wireless telegraph key manufacturers including photos of most Marconi keys
- United States Senate Inquiry into the Titanic disaster – Testimony of Guglielmo Marconi
- Priority of invention
- PBS: Marconi and Tesla: Who invented radio?
- United States Supreme Court, Marconi Wireless Telegraph co. of America v. United States. 320 U.S. 1. Nos. 369, 373. Argued 9–12 April 1943. Decided 21 June 1943.
- 21st Century Books: Priority in the Invention of Radio – Tesla vs. Marconi
- Information about Marconi and his yacht Elettra
- I diari di laboratorio di Guglielmo Marconi (The diaries of laboratory Guglielmo Marconi.)
- Comitato Guglielmo Marconi International, Bologna, Italy (Marconi's voice)
- August 1914 photo article on Marconi Belmar station in Wall, NJ, InfoAge. (See also, Marconi Period of Significance Historic Buildings.)
- Marconi, Guglielmo: Statue north of Meridian Hill Park in Washington, D.C. by Attilio Piccirilli
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