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Saturday, 7 August 2010

Guglielmo Marconi

For the inventor of radio, see the competing claims in History of radio and the Invention of radio.

Guglielmo Marconi

Born 25 April 1874(1874-04-25)

Palazzo Marescalchi, Bologna, Italy

Died 20 July 1937 (aged 63)

Rome, Italy

Known for Radio

Notable awards Nobel Prize for Physics (1909)


Guglielmo Marconi (Italian pronunciation: [ɡuʎˈʎɛːlmo marˈkoːni]; 25 April 1874– 20 July 1937) was an Italian inventor, best known for his development of a radio telegraph system, which served as the foundation for the establishment of numerous affiliated companies worldwide. He shared the 1909 Nobel Prize in Physics with Karl Ferdinand Braun "in recognition of their contributions to the development of wireless telegraphy"[1][2][3] and was ennobled in 1924 as Marchese Marconi.

Contents [hide]

1 Biography

1.1 Early years

1.2 Radio work

1.2.1 Early experimental devices

1.2.2 Transatlantic transmissions

1.2.3 Titanic

1.2.4 Patent disputes

1.2.5 Continuing work

1.3 Later years

2 Personal life

3 Legacy and honours

3.1 Honours and awards

3.2 Tributes

3.3 Places and organizations named after Marconi

4 Patents

4.1 British patents

4.2 US patents

5 See also

6 Notes

7 Further reading

8 External links

[edit] Biography

Guglielmo Marconi Memorial in Washington, D.C. The memorial is listed on the National Register of Historic Places.[edit] Early years

Marconi was born near Bologna, the second son of Giuseppe Marconi, an Italian landowner, and his Protestant[citation needed] Irish wife, Annie Jameson, granddaughter of the founder of the Jameson Whiskey distillery.[1] Marconi was educated in Bologna in the lab of Augusto Righi, in Florence at the Istituto Cavallero and, later, in Livorno. As a child Marconi did not do well in school.[4] Baptized as a Catholic, he was also a member of the Anglican Church, being married into it; however, he still received a Catholic annulment.

[edit] Radio work

During his early years, Marconi had an interest in science and electricity. One of the scientific developments during this era came from Heinrich Hertz, who, beginning in 1888, demonstrated that one could produce and detect electromagnetic radiation—now generally known as "radio waves", at the time more commonly called "Hertzian waves" or "aetheric waves". Hertz's death in 1894 brought published reviews of his earlier discoveries, and a renewed interest on the part of Marconi. He was permitted to briefly study the subject under Augusto Righi, a University of Bologna physicist and neighbor of Marconi who had done research on Hertz's work. Righi had a subscription to The Electrician where Oliver Lodge published detailed accounts of the apparatus used in his (Lodge's) public demonstrations of wireless telegraphy in 1894.

[edit] Early experimental devices

Marconi began to conduct experiments, building much of his own equipment in the attic of his home at the Villa Griffone in Pontecchio, Italy. His goal was to use radio waves to create a practical system 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 had been exploring wireless telegraph technologies for over 50 years, but none had proven commercially successful. Marconi did not discover any new and revolutionary principle in his wireless-telegraph system, but rather he assembled and improved a number of components, unified and adapted them to his system.[5] Marconi's system had the following components:[6]

A relatively simple oscillator, or spark producing radio transmitter, which was closely modeled after one designed by Righi, in turn similar to what Hertz had used;

A wire or capacity area placed 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.

Similar configurations using spark-gap transmitters plus coherer-receivers had been tried by others, but many were unable to achieve transmission ranges of more than a few hundred metres.

At first, Marconi could only signal over limited distances. In the summer of 1895 he moved his experimentation outdoors. After increasing the length of the transmitter and receiver antennas, and arranging them vertically, and positioning the antenna so that it touched the ground, the range increased significantly.[7][8] Soon he was able to transmit signals over a hill, a distance of approximately 1.5 kilometres (0.93 mi).[9] By this point he concluded that with additional funding and research, a device could become capable of spanning greater distances and would prove valuable both commercially and militarily.

Finding little interest in his work in Italy, in early 1896 at the age of 21, Marconi traveled to London, accompanied by his mother, to seek support for his work; Marconi spoke fluent English in addition to Italian. While there, he gained the interest and support of William Preece, the Chief Electrical Engineer of the British Post Office. The apparatus that Marconi possessed at that time was strikingly similar to that of one in 1882 by A. E. Dolbear, of Tufts College, which used a spark coil generator and a carbon granular rectifier for reception.[10][11] A plaque on the outside of BT Centre commemorates Marconi's first public transmission of wireless signals from that site.[12] A series of demonstrations for the British government followed—by March 1897, Marconi had transmitted Morse code signals over a distance of about 6 kilometres (3.7 mi) across the Salisbury Plain. On 13 May 1897, Marconi sent the first ever wireless communication over open sea. It transversed the Bristol Channel from Lavernock Point (South Wales) to Flat Holm Island, a distance of 6 kilometres (3.7 mi). The message read "Are you ready".[13] The receiving 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 "Signaling 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, Ireland, was conducted on 6 July 1898. The English channel was crossed on 27 March 1899, from Wimereux, France to South Foreland Lighthouse, England, and in the autumn of 1899, the first demonstrations in the United States took place, with the reporting of the America's Cup international yacht races at New York.

Marconi sailed to the United States at the invitation of the New York Herald newspaper to cover the America's Cup races off Sandy Hook, NJ. The transmission was done aboard the SS Ponce, a passenger ship of the Porto Rico Line. [14] Marconi left for England on 8 November 1899 on the American Line's SS St. Paul, and he and his assistants installed wireless equipment aboard during the voyage. On 15 November the St. Paul became the first ocean liner to report her imminent arrival by wireless when Marconi's Needles station contacted her sixty-six nautical miles off the English coast.

According to the Proceedings of the United States Naval Institute, the Marconi instruments were tested around 1899 and the tests concerning his wireless system found that the "[...] coherer, principle of which was discovered some twenty years ago, [was] the only electrical instrument or device contained in the apparatus that is at all new".[15]

[edit] Transatlantic transmissions

Marconi watching associates raise kite antenna at St. John's, December 1901“ See if you can hear anything, Mr. Kemp![16] ”

Around the turn of the century, Marconi began investigating the means to signal completely 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 and Clifden in Co. Galway. He soon made the announcement that on 12 December 1901, using a 152.4-metre (500 ft) kite-supported antenna for reception, the message was received at Signal Hill in St John's, Newfoundland (now part of Canada) signals transmitted by the company's new high-power station at Poldhu, Cornwall. The distance between the two points was about 3,500 kilometres (2,200 mi). Heralded as a great scientific advance, there was—and continues to be—some skepticism about this claim, partly because the signals had been heard faintly and sporadically. There was no independent confirmation of the reported reception, and the transmissions, consisting of the Morse code letter S sent repeatedly, 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.)[17] The Poldhu transmitter was a two-stage circuit.[18][19] The first stage operated at lower voltage and provided the energy for the second stage to spark at a higher voltage. Nikola Tesla, a rival in transatlantic transmission, stated after being told of Marconi's reported transmission that "Marconi [... was] using seventeen of my patents."[20][21]

Feeling challenged by skeptics, Marconi prepared a better organized 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 2,496 kilometres (1,551 mi), and audio reception up to 3,378 kilometres (2,099 mi). The maximum distances were achieved at night, and these tests were the first to show that for mediumwave and longwave transmissions, radio signals travel much farther at night than in the day. During the daytime, signals had only been received up to about 1,125 kilometres (699 mi), 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 they were essentially limited to line-of-sight distances.

On 17 December 1902, a transmission from the Marconi station in Glace Bay, Nova Scotia, Canada, became the first radio message to cross the Atlantic from North America. On 18 January 1903, a Marconi station built near South Wellfleet, Massachusetts in 1901 sent a message of greetings from Theodore Roosevelt, the President of the United States, to King Edward VII of the United Kingdom, marking the first transatlantic radio transmission originating in the United States. This station also was one of the first to receive the distress signals coming from the RMS Titanic. 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 a commercial service was established 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[22] between Clifden Ireland and Glace Bay, but even after this the company struggled for many years to provide reliable communication.

[edit] Titanic

The two radio operators aboard the Titanic—Jack Phillips and Harold Bride—were not employed by the White Star Line, but by the Marconi International Marine Communication Company. Following the sinking of the ocean liner, survivors were rescued by the RMS Carpathia of the Cunard Line.[23] Also employed by the Marconi Company was David Sarnoff, the only person to receive the names of survivors immediately after the disaster via wireless technology. Wireless communications were reportedly maintained for 72 hours between the Carpathia and Sarnoff,[24] but Sarnoff's involvement has been questioned by some modern historians. When the Carpathia docked in New York, Marconi went aboard with a reporter from The New York Times to talk with Bride, the surviving operator.[23] On 18 June 1912, Marconi gave evidence to the Court of Inquiry into the loss of the Titanic regarding the marine telegraphy's functions and the procedures for emergencies at sea.[25] 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 marvelous invention."

[edit] Patent disputes

Main articles: Invention of radio and History of radio.

Marconi's work built upon the discoveries of numerous other scientists and experimenters. His "two-circuit" equipment, consisting of a spark-gap transmitter plus a coherer-receiver, was similar to those used by other experimenters, and in particular to that employed by Oliver Lodge in a series of widely reported demonstrations in 1894. There were claims that Marconi was able to signal for greater distances than anyone else when using the spark-gap and coherer combination, but these have been disputed (notably by Tesla).[9]

In 1900 Alexander Stepanovich Popov stated to the Congress of Russian Electrical Engineers that: "[...] the emission and reception of signals by Marconi by means of electric oscillations [was] nothing new. In America, the famous engineer Nikola Tesla carried the same experiments in 1893."[26]

The Fascist regime in Italy credited Marconi with the first improvised arrangement in the development of radio.[27] There was controversy whether his contribution was sufficient to deserve patent protection, or if his devices were too close to the original ones developed by Hertz, Popov, Branley, Tesla, and Lodge to be patentable.

While Marconi did pioneering demonstrations for the time, his equipment was limited by being essentially untuned, which greatly restricted the number of spark-gap radio transmitters which could operate simultaneously in a geographical area without causing mutually disruptive interference. (Continuous-wave transmitters were naturally more selective and less prone to this deficiency). Marconi addressed this defect with a patent application for a much more sophisticated "four-circuit" design, which featured two tuned-circuits at both the transmitting and receiving antennas. This was issued as British patent number 7,777 on 26 April 1900. However, this patent came after significant earlier work had been done on electrical tuning by Nikola Tesla and Oliver Lodge. (As a defensive move, in 1911 the Marconi Company purchased the Lodge-Muirhead Syndicate, whose primary asset was Oliver Lodge's 1897 tuning patent. This followed a 1911 court case in which the Marconi company was ruled to have illegally used the techniques described under Lodge's tuning patent.) Thus, the "four-sevens" patent and its equivalents in other countries was the subject of numerous legal challenges, with rulings which varied by jurisdiction, from full validation of Marconi's tuning patent to complete nullification.

In 1943, a lawsuit regarding Marconi's numerous other radio patents was resolved in the United States. The court decision was based on the prior work conducted by others, including Nikola Tesla, Oliver Lodge, and John Stone Stone, from which some of Marconi patents (such as U.S. Patent 763,772) stemmed. The U. S. Supreme Court stated that,

The Tesla patent No. 645,576, applied for 2 September 1897 and allowed 20 March 1900, disclosed a four-circuit system, having two circuits each at transmitter and receiver, and recommended that all four circuits be tuned to the same frequency. [... He] recognized that his apparatus could, without change, be used for wireless communication, which is dependent upon the transmission of electrical energy.[28]

In making their decision, the court noted,

Marconi's reputation as the man who first achieved successful radio transmission rests on his original patent, which became reissue No. 11,913, and which is not here [320 U.S. 1, 38] in question. That reputation, however well-deserved, does not entitle him to a patent for every later improvement which he claims in the radio field. Patent cases, like others, must be decided not by weighing the reputations of the litigants, but by careful study of the merits of their respective contentions and proofs."[29]

The court also stated that,

It is well established that as between two inventors priority of invention will be awarded to the one who by satisfying proof can show that he first conceived of the invention."[29]

The Supreme Court of the United States did not dispute Marconi's original British patent nor his reputation as the inventor of radio. The US Supreme Court stated that his original patent (which became reissue 11,913) was not being disputed.[30]

The case was resolved in the U.S. Supreme Court by overturning most of Marconi's patents. At the time, the United States Army was involved in a patent infringement lawsuit with Marconi's company regarding radio, leading observers to posit that the government nullified Marconi's other patents to render moot claims for compensation (as, it is speculated, the government's initial reversal to grant Marconi the patent right in order to nullify any claims Tesla had for compensation). In contrast to the United States system, Mr. Justice Parker of the British High Court of Justice upheld Marconi's "four-sevens" tuning patent. These proceedings made up only a part of a long series of legal struggles, as major corporations jostled for advantage in a new and important industry.

The 1895 public demonstrations by J.C. Bose in Calcutta regarding radio transmission were conducted before Marconi's wireless signaling experiments on Salisbury Plain in England in May 1897.[31][32] In 1896, the Daily Chronicle of England reported on his UHF experiments: "The inventor (J.C. Bose) has transmitted signals to a distance of nearly a mile and herein lies the first and obvious and exceedingly valuable application of this new theoretical marvel." Marconi, while being fully aware of Bose's prior work in this area, nonetheless claimed exclusive patent rights.[33]

[edit] Continuing work

“ Have I done the world good, or have I added a menace?[34] ”

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 only be used for radiotelegraph 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). In 1920, employing a vacuum tube transmitter, the Chelmsford Marconi factory was the location for the first entertainment radio broadcasts in the United Kingdom—one of these featured Dame Nellie Melba. In 1922 regular entertainment broadcasts commenced from the Marconi Research Centre at Writtle.

[edit] Later years

“ His Excellency the Senator Marchese Guglielmo Marconi, president of the Royal Academy of Italy, Member of the Fascist Grand Council ”

In 1914 Marconi was made a Senator in the Italian Senate 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 Italian Army and of commander in the Italian Navy. In 1924, 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.

Marconi died in Rome in 1937 at age 63 following a series of heart attacks, and Italy held a state funeral for him. As a tribute, all radio stations throughout the world observed two minutes of silence. His remains are housed in the Villa Griffone at Sasso Marconi, Emilia-Romagna, which assumed that name in his honour in 1938.

[edit] Personal life

Marconi had a brother, Alfonso, and a stepbrother, Luigi. On 16 March 1905, Marconi married Beatrice O'Brien (1882–1976), daughter of Edward Donough O'Brien, 14th Baron Inchiquin, Ireland. They had three daughters—Degna (1908–1998), Gioia (1916–1996) and a third who lived only a few weeks—and a son, Giulio (1910–1971). They divorced in 1924 and the marriage was annulled in 1927. On 15 June 1927, Marconi married Maria Cristina Bezzi-Scali (1900–1994); Fascist dictator Benito Mussolini was Marconi's best man at the wedding.[35][36] They had one daughter, Elettra (born 1930). Later in life, Marconi was an active Italian Fascist[37] and an apologist for their ideology and actions such as the attack by Italian forces in Ethiopia.

In 1915 his friend Mrs. Mary Cummins Brown of New York perished in the sinking of the British luxury liner RMS Lusitania off the Irish coast, a fact he wrote about two days later in The New York Times.

[edit] Legacy and honours

[edit] Honours and awards

In 1909, Marconi shared the Nobel Prize in Physics with Karl Braun for his contributions to radio communications.[1]

In 1918, he was awarded the Franklin Institute's Benjamin Franklin Medal.

In 1924, he was made a marquess by King Victor Emmanuel III., thus becoming Marchese Marconi.

The Radio Hall of Fame (Museum of Broadcast Communications, Chicago) inducted Marconi soon after the inception of its awards. He was inducted into the New Jersey Hall of Fame in 2009.[38]

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.

Marconi was inducted into the National Broadcasters Hall of Fame in 1977.[39]

A commemorative British two pound coin was released in 2001 celebrating the 100th anniversary of Marconi's first wireless communication.

A commemorative silver 5 EURO coin was issued by Italy in 2009 honouring the centennial of Marconi's Nobel Prize.

[edit] Tributes

The premier collection of Marconi artifacts was held by The General Electric Company, p.l.c. (GEC) of the United Kingdom which later renamed to 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 gifted to the Nation by the Company via the University of Oxford. This consisted of the BAFTA award-winning MarconiCalling website, some 250+ physical artifacts and the massive ephemera collection of papers, books, patents and many other items. The artifacts are now held by The Museum of the History of Science and the ephemera Archives by the nearby Bodleian Library. The latest release, following three years work at the Bodleian, is the Online Catalogue to the Marconi Archives, released in November 2008.

Ira Gershwin's lyrics to "They All Laughed" include the line, "They told Marconi wireless was a phony."

The band Tesla references him in "Edison's Medicine" lyrics: They'll sell you on Marconi, familiar, but a phony."

The band Jefferson Starship references him in their song We Built This City. The lyrics say: "Marconi plays the mamba, listen to the radio".

The 1979 play 'The Man From Mukinupin' by Dorothy Hewett makes several references to Marconi by the character The Flasher, who imagines he is communicating with Marconi through a box of matches. "Marconi the great one, speak to me!", "Marconi, Marconi, must I kill?" and "Marconi says I must not frighten the ladies..."

The Bermuda rig, developed in the 17th century by Bermudians, became ubiquitous on sailboats around the world in the 20th century. The tall masts and triangular fore-and-aft sails reminded some people of Marconi's wireless towers, hence the rig became known also as the Marconi rig.

[edit] Places and organizations named after Marconi


Guglielmo Marconi Airport (IATA: BLQ – ICAO: LIPE), of Bologna, Italy, is named after Marconi, its native son.

Via Guglielmo Marconi in in the city of Bologna, Italy


Australian soccer club Marconi Stallions


The 'Marconi's Wireless Telegraph Company of Canada', of Montreal, Canada, was created in 1903 by Guglielmo Marconi.[40] In 1925 the company was renamed to the 'Canadian Marconi Company', which was acquired by English Electric in 1953.[40] The company name changed again to CMC Electronics Inc. (French: CMC Électronique) in 2001.

The Marconi Wireless Corporation operated several pioneer and commercial radio stations in Canada, Ireland, Newfoundland, the United States and the United Kingdom.

The Marconi National Historic Site 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.

Villa Marconi retirement home, Nepean, Ontario

People's Republic of China

Marconi Road in Kowloon Tong, former home of many of Hong Kong's broadcasters, including Asia Television Limited and Television Broadcasts Limited

United States

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.

Marconiville section of the town of Copiague

Upper East Side New York's La Scuola D'Italia

Marconi Conference Center and State Historic Park, Marshall, California. Site of the transoceanic Marshall Receiving Station.

Marconi Avenue, The Hill, St. Louis

Marconi memorial statue on Telegraph Hill, San Francisco

Marconi Beach in Wellfleet, Massachusetts, part of the Cape Cod National Seashore, located near the site of his first transatlantic wireless signal from the U.S to England.

Marconi monument at Fulton intersection, Sacramento, CA

Marconi Boulevard in Rocky Point, New York. His original radio shack is found along that road at the Frank J. Carasiti Elementary School in Rocky Point.

Guglielmo Marconi Memorial Plaza in Somerset, NJ, located on the former site of the New Brunswick Marconi Station. President Woodrow Wilson's Fourteen Points speech was transmitted from the site in 1918.

Marconi Road in Wall Township, New Jersey, located in the former Camp Evans, which was the site of the Belmar Marconi Station. Now the location of the Infoage Science/History Learning Center, dedicated to the preservation and education of information age technologies.

Marconi Avenue in Sacramento, California.

[edit] Patents

[edit] British patents

British patent No. 12,039, 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)

[edit] US patents

U.S. Patent 0,586,193 "Transmitting electrical signals", (using Ruhmkorff coil and Morse code key) filed December 1896, patented July, 1897

U.S. Patent 0,624,516 "Apparatus employed in wireless telegraphy".

U.S. Patent 0,627,650 "Apparatus employed in wireless telegraphy".

U.S. Patent 0,647,007 "Apparatus employed in wireless telegraphy".

U.S. Patent 0,647,008 "Apparatus employed in wireless telegraphy".

U.S. Patent 0,647,009 "Apparatus employed in wireless telegraphy".

U.S. Patent 0,650,109 "Apparatus employed in wireless telegraphy".

U.S. Patent 0,650,110 "Apparatus employed in wireless telegraphy".

U.S. Patent 0,668,315 "Receiver for electrical oscillations".

U.S. Patent 0,760,463 "Wireless signaling system".

U.S. Patent 0,792,528 "Wireless telegraphy". Filed 13 October 1903; Issued 13, 1905.

U.S. Patent 0,676,332 "Apparatus for wireless telegraphy" (later practical version of system)

U.S. Patent 0,757,559 "Wireless telegraphy system". Filed 19 November 1901; Issued 19 April 1904.

U.S. Patent 0,760,463 "Wireless signaling system". Filed 10 September 1903; Issued 24 May 1904.

U.S. Patent 0,763,772 "Apparatus for wireless telegraphy" (Four tuned system; this innovation was predated by N. Tesla, O. Lodge, and J. S. Stone)

U.S. Patent 0,786,132 "Wireless telegraphy". Filed 13 October 1903

U.S. Patent 0,792,528 "Wireless telegraphy". Filed 13 October 1903; Issued 13 June 1905.

U.S. Patent 0,884,986 "Wireless telegraphy". Filed 28 November 1902; Issued 14 April 1908.

U.S. Patent 0,884,987 "Wireless telegraphy".

U.S. Patent 0,884,988 "Detecting electrical oscillations". Filed 2 February 1903; Issued 14 April 1908.

U.S. Patent 0,884,989 "Wireless telegraphy".

U.S. Patent 0,935,381 "Transmitting apparatus for wireless telegraphy". Filed 10 April 1908; Issued 28 September 1909.

U.S. Patent 0,935,382 "Apparatus for wireless telegraphy".

U.S. Patent 0,935,383 "Apparatus for wireless telegraphy". Filed 10 April 1908; Issued 28 September 1909.

U.S. Patent 0,954,640 "Apparatus for wireless telegraphy". Filed 31 March 1909; Issued 12 April 1910.

U.S. Patent 0,997,308 "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 1,148,521 "Transmitter for wireless telegraphy". Filed 20 July 1908.

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.

[edit] See also

Invention of radio

Jagdish Chandra Bose

List of people on stamps of Ireland

Sasso Marconi

List of people on the cover of Time Magazine: 1920s - 6 Dec. 1926

[edit] Notes

1.^ a b c "Guglielmo Marconi: The Nobel Prize in Physics 1909"

2.^ "Welcome to IEEE Xplore 2.0: Sir J.C. Bose diode detector received Marconi's first transatlanticwireless signal of December 1901 (the “Italian Navy Coherer”Scandal Revisited)". Ieeexplore.ieee.org. http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=658778. Retrieved 2009-01-29.

3.^ Roy, Amit (2008-12-08). "Cambridge 'pioneer' honour for Bose". The Telegraph (Calcutta: Telegraphindia.com). http://www.telegraphindia.com/1081208/jsp/nation/story_10221833.jsp. Retrieved 2010-06-10.

4.^ Robert McHenry, "Guglielmo Marconi," in Encyclopaedia Britannica, 1993.

5.^ Williams, H. S., & Williams, E. H. (1910). Every-day science. New York: Goodhue Company. Page 54.

6.^ 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. Page 198.

7.^ This fact was known to many as, in 1893, Tesla stated in the widely known "On Light and Other High Frequency Phenomena" speech which was delivered before the Franklin Institute, Philadelphia, in February, and before the National Electric Light Association, St. Louis, in March, that "One of the terminals of the source would be connected to Earth [as a electric ground connection ...] the other to an insulated body of large surface".

8.^ Marconi did acknowledge this later 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. Page 206.

9.^ a b Marconi's late-1895 transmission of signals was for around a mile (1.6 km). This was small compared to Tesla's early-1895 transmissions of up to 50 miles. For more see "Nikola Tesla On His Work with Alternating Currents and Their Application to Wireless Telegraphy, Telephony, and Transmission of Power", Leland I. Anderson, Twenty First Century Books, 2002, pp. 26-27.

10.^ Alfred Thomas Story, The Story of Wireless Telegraphy. 1904. Page 58.

11.^ John J. O'Neill, Prodigal Genius:The Life of Nikola Tesla. Ives Washburn, New York, 1944

12.^ "Flickr Photo". http://www.flickr.com/photos/psd/164193649/.

13.^ BBC Wales, "Marconi's Waves"

14.^ Helgesen, Henry N.. "Wireless Goes to Sea: Marconi's Radio and SS Ponce". Sea History (Spring 2008): 122.

15.^ United States Naval Institute, Proceedings of the United States Naval Institute. The Institute, 1899. Page 857.

16.^ Page, Walter Hines, and Arthur Wilson Page, The World's Work. Doubleday, Page & Company, 1908. Page 9625

17.^ "Fessenden and Marconi: Their Differing Technologies and Transatlantic Experiments During the First Decade of this Century". Ieee.ca. http://www.ieee.ca/millennium/radio/radio_differences.html. Retrieved 2009-01-29.

18.^ "Marconi and the History of Radio".

19.^ John S. Belrose, "Fessenden and Marconi: Their Differing Technologies and Transatlantic Experiments During the First Decade of this Century". International Conference on 100 Years of Radio -- 5–7 September 1995.

20.^ Margaret Cheney, Tesla, Man Out of Time, New Jersey : Prentice-Hall, Inc., 1981

21.^ Margaret Cheney and Robert Uth, Tesla: Master of Lightning, Barnes & Noble, 1999.

22.^ "The Clifden Station of the Marconi Wireless Telegraph System". Scientific American. 23 November 1907.

23.^ a b John P. Eaton & Charles A. Haas Titanic - Triumph and Tragedy, A Chronicle in Words and Pictures. 1994

24.^ Herron, Edward A. (1969). Miracle of the Air Waves: A History of Radio. Messner.

25.^ Court of Inquiry Loss of the S.S. Titanic 1912

26.^ "The Guglielmo Marconi Case; Who is the True Inventor of Radio".

27.^ Gianni Isola, "Italian radio: History and Historiography"; Special Issue: Italian Media Since World War II. Historical Journal of Film, Radio and Television, August, 1995

28.^ U.S. 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.

29.^ a b Wireless Telegraph co. of America v. United States.

30.^ U.S. 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.

31.^ "The Work of Jagdish Chandra Bose: 100 years of mm-wave research". tuc.nrao.edu.

32.^ "Jagadish Chandra Bose", ieeeghn.org.

33.^ Bondyopadhyay, P.K. (January 1998). "Sir J. C. Bose's Diode Detector Received Marconi's First Transatlantic Wireless Signal Of December 1901 (The "Italian Navy Coherer" Scandal Revisited)". Proceedings of the IEEE 86 (1): 259–285. doi:10.1109/5.658778. http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel3/5/14340/00658778.pdf?arnumber=658778. Retrieved 2007-03-13.

34.^ William John Baker, "History Of The Marconi Company 1874-1965". 1996. 416 pages. Page 296

35.^ George P. Oslin, The Story of Telecommunications. 1992. 507 pages. Page 294.

36.^ Gerald Sussman, Communication, Technology, and Politics in the Information Age. 1997. Page 90.

37.^ Physicsworld.com, "Guglielmo Marconi: radio star", 2001

38.^ New Jersey to Bon Jovi: You Give Us a Good Name Yahoo News, 2 February 2009

39.^ National Broadcasters Hall of Fame Accessed 2009-02-10

40.^ a b "CMC Electronics' Profile" (in English). CMC Electronics Inc.. http://www.cmcelectronics.ca/En/About/cmc_profile_en.html. Retrieved 2007-01-12.

[edit] Further reading

Relatives and company publications

Bussey, Gordon, Marconi's Atlantic Leap, Marconi Communications, 2000. ISBN 0-95389-670-6

Marconi, Degna, My Father, Marconi, James Lorimer & Co, 1982. ISBN 0-919511-14-7 - (Italian version): Marconi, mio padre, Di Renzo Editore, 2008, ISBN 8883232062

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.

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 U.S.A. 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

Hong, Sungook, Wireless: From Marconi’s Black-Box to the Audio, Cambridge, Mass.: MIT Press, 2001. ISBN 0-262-08298-5.

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.

Kinzie, P. A., Early Wireless: Marconi was not Alone.

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.

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. 707 pages.

Page, Walter Hines, and Arthur Wilson Page, The World's Work. Doubleday, Page & Company, 1908. Page 9625

Perry, Lawrence (March 1902). "Commercial Wireless Telegraphy". The World's Work: A History of Our Time V: 3194–3201.

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 U.S. government during World War I.

[edit] External links

Wikimedia Commons has media related to: Guglielmo Marconi


University of Oxford Marconi Calling

University of Oxford Online Catalogue of the Marconi Collection

University of Oxford Online Catalogue of the Marconi Archives

Guglielmo Marconi Foundation, Pontecchio Marconi, Bologna, Italy

Canadian Heritage Minute featuring Marconi

Guglielmo Marconi documentary narrated by Walter Cronkite

Nobel Prize: Guglielmo Marconi biography

Review of Signor Marconi's Magic Box

Information about Marconi and his yacht Elettra

Comitato Guglielmo Marconi International, Bologna, Italy

I diari di laboratorio di Guglielmo Marconi

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"

List of British and French patents (1896-1924)

Sparks Telegraph Key Review An exhaustive listing of wireless telegraph key manufacturers including photos of most Marconi keys

Cherished Television, Part one: The Pioneers

Marconi Belmar station, InfoAge. (See also, Marconi Period of Significance Historic Buildings)

Marconi on the 2000 Italian Lire banknote.

Marconi's Use of Kites to Assist Wireless Communication

Marconi and "wireless telegraphy" using kites

Marconi's Case File at The Franklin Institute with info about his 1918 Franklin Medal for application of radio waves to communications

History of Marconi House

Marconi Memorial in Washington, DC

Transatlantic "signals"

BBC Reference to his first transmission over water

Faking the Waves, 1901

Marconi and His South Wellfleet Wireless (Cape Cod National Seashore

Priority of invention

vs Tesla

PBS: Marconi and Tesla: Who invented radio?

The Guglielmo Marconi Case Who is the True Inventor of Radio

U.S. 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

vs Popov

Who started the electronic era?

Academic offices

Preceded by

January Smuts Rector of the University of St Andrews

1934 - 1937 Succeeded by

Robert MacGregor Mitchell

1 comment:

  1. Rosslare,
    The Expanse system is comprised of several units, the main unit, the EXP-10...