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Scophony
Scophony was a sophisticated mechanical television system developed in Britain by Scophony Limited. A black and white image was produced by an early form of acousto-optic modulation of a bright light using a piezoelectric crystal and water or other transparent liquid column. Principle of operation The light modulator worked as follows. Crystal vibrations at one end of a horizontal water column would cause waves to propagate through the water. The light was passed through this column from the side across the waves as they propagated through the column, via separate horizontal and vertical orientated cylindrical lenses. The vibrations through the water would act as a diffraction grating, the higher the amplitude, the more that the light passing through would be diffracted. The light passed through the water column was then horizontally focussed onto either a slit or narrow optical block, depending on whether positive or negative modulation of the water column was used. The amount ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mechanical Television
Mechanical television or mechanical scan television is a television system that relies on a mechanical scanning device, such as a rotating disk with holes in it or a rotating mirror drum, to scan the scene and generate the video signal, and a similar mechanical device at the receiver to display the picture. This contrasts with vacuum tube electronic television technology, using electron beam scanning methods, for example in cathode ray tube (CRT) televisions. Subsequently, modern solid-state liquid-crystal displays (LCD) are now used to create and display television pictures. Mechanical-scanning methods were used in the earliest experimental television systems in the 1920s and 1930s. One of the first experimental wireless television transmissions was by John Logie Baird on October 2, 1925, in London. By 1928 many radio stations were broadcasting experimental television programs using mechanical systems. However the technology never produced images of sufficient quality to become ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jeffree Cell
The Jeffree cell was an early acousto-optic modulator, best known for its use in the Scophony system of mechanical television. It was invented by J.H. Jeffree in 1934, and was a major improvement over the Kerr cell modulators used up to that time by allowing more than 200 times the available modulated light. Using ultrasonic sound waves travelling perpendicular to the light, the modulator created areas of varying refractive index In optics, the refractive index (or refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. The refractive index determines how much the path of light is bent, or ... leading to advancement and retardation of portions of the light wavefront. This led to constructive and destructive interference among the light waves, modulating their intensity. External links Scophony system at Early Television website References Optical devices {{tech-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EKCO
EKCO (from Eric Kirkham Cole Limited) was a British electronics company producing radio and television sets from 1924 until 1960. Expanding into plastic production for its own use, Ekco Plastics produced both radio cases and later domestic plastic products; the plastics company became Lin Pac Mouldings Ltd. Early history The company's founder Eric Kirkham Cole was born on 4 July 1901 at Prittlewell, Southend-on-Sea, Essex, and was educated at Southend Day Technical School, followed by a three-year apprenticeship. Cole and his future wife Muriel Bradshaw started out making radio sets in 1924.Oxford Dictionary of National Biography: Cole, Eric Kirkham by Rowland F. Pocock William Streatfield Verrells, a schoolmaster and freelance journalist from Southend-on-Sea, wrote an article in a local newspaper asking if it was possible to power a radio set from the mains electricity supply rather than batteries. Cole saw a possible business opportunity and set about building his battery e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Television
The concept of television was the work of many individuals in the late 19th and early 20th centuries. The first practical transmissions of moving images over a radio system used mechanical rotating perforated disks to scan a scene into a time-varying signal that could be reconstructed at a receiver back into an approximation of the original image. Development of television was interrupted by the Second World War. After the end of the war, all-electronic methods of scanning and displaying images became standard. Several different standards for addition of color to transmitted images were developed with different regions using technically incompatible signal standards. Television broadcasting expanded rapidly after World War II, becoming an important mass media, mass medium for advertising, propaganda, and entertainment. Television broadcasts can be distributed over the air by VHF and UHF radio signals from terrestrial transmitting stations, by microwave signals from Earth orbi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ferranti
Ferranti or Ferranti International plc was a UK electrical engineering and equipment firm that operated for over a century from 1885 until it went bankrupt in 1993. The company was once a constituent of the FTSE 100 Index. The firm was known for work in the area of power grid systems and defence electronics. In addition, in 1951 Ferranti began selling an early computer, the Ferranti Mark 1. The Belgian subsidiary lives on as Ferranti Computer Systems and as of 1994 is part of the Nijkerk Holding. History Beginnings Sebastian Ziani de Ferranti established his first business Ferranti, Thompson and Ince in 1882. The company developed the Ferranti-Thompson Alternator. Ferranti focused on alternating current power distribution early on, and was one of the few UK experts. To avoid confusion, he is often referred to as Dr Ferranti to distinguish him from the Ferranti company itself. In 1885 Dr Ferranti established a new business, with Francis Ince and Charles Sparks as partners, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joshua Sieger
Joshua Sieger (5 January 1907 – 1 March 1993) was an English scientist and engineer. The founder of the gas detection brand J&S Sieger (known today as Honeywell Analytics), was not only the father of modern gas detection but a pioneer of diverse communications technologies. He impacted on a variety of industries, helping to catalyze technological advancement in a number of fields including television, radar and gas detection.''I was there – An Autobiography'', by Joshua Sieger, published by the Poole Historical Trust, 2003 Footnotes http://www.purbeckradar.org.uk/people/list-by-group.htm http://www.proz.com/kudoz/german_to_english/engineering:_industrial/2194856-siegerkopf.html {{DEFAULTSORT:Sieger, Joshua 1907 births 1993 deaths Commanders of the Order of the British Empire People from Shepherd's Bush 20th-century British engineers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulises Armand Sanabria
Ulises Armand Sanabria (September 5, 1906 January 6, 1969) was born in southern Chicago of Puerto Rican and French-American parents. Sanabria is known for development of mechanical televisions and early terrestrial television broadcasts. Career Sanabria was the builder and engineer of WCFL, the first mechanical television station which went on the air in Chicago on June 12, 1928. By sending the sound signal to station WIBO and the video signal on WCFL, he was the first to transmit sound and picture simultaneously on the same wave band on May 19, 1929. At age 15 Sanabria told his girlfriend that he was going to invent television. Two years later, he figured out how to do it. Two more years later, at the age of 19, he demonstrated the first television in Chicago. This was only months after the first demonstrations of mechanical television by Charles Francis Jenkins in the US and John Logie Baird in the UK. By 1929, Sanabria was operating his own station, WX9AO, with the help ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiolympia
''Radiolympia'', also known as the Radio Show, was a pioneering exhibition of radio equipment, latterly television equipment, held annually at Olympia, London, Olympia in London, England, in the 1920s to 1940s, except for a period of interruption during World War II. The first such exhibition was held in 1926. On 26 August 1936, the first high-definition standard (Baird 240 lines) television transmission was made in a test by the BBC from the exhibition. The day after, the Marconi-EMI (405-line television system, 405 lines) system was used. The record attendance was 238,000 in 1934. References External links * {{Coord, 51, 29, 47, N, 0, 12, 35, W, region:GB_type:landmark, display=title History of radio History of television 1926 establishments in England Annual events in London ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
405 Line
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. In mathematics Four is the smallest composite number, its proper divisors being and . Four is the sum and product of two with itself: 2 + 2 = 4 = 2 x 2, the only number b such that a + a = b = a x a, which also makes four the smallest squared prime number p^. In Knuth's up-arrow notation, , and so forth, for any number of up arrows. By consequence, four is the only square one more than a prime number, specifically three. The sum of the first four prime numbers two + three + five + seven is the only sum of four consecutive prime numbers that yields an odd prime number, seventeen, which is the fourth super-prime. Four lies between the first proper pair of twin primes, three and five, which are the first two Fermat primes, like seventeen, which is the third. On the other ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Stephenson
Sir William Samuel Stephenson (23 January 1897 – 31 January 1989), born William Samuel Clouston Stanger, was a Canadian soldier, fighter pilot, businessman and spymaster who served as the senior representative of the British Security Coordination (BSC) for the western allies during World War II. He is best known by his wartime intelligence codename, Intrepid. Many people consider him to be one of the real-life inspirations for James Bond. Ian Fleming himself once wrote, "James Bond is a highly romanticised version of a true spy. The real thing is... William Stephenson." As head of the British Security Coordination (BSC), Stephenson handed British scientific secrets over to Franklin D. Roosevelt and relayed American secrets back to Winston Churchill. In addition, Stephenson has been credited with changing American public opinion from an isolationist stance to a supportive tendency regarding the United States' entry into World War II. Early life Stephenson was born Willi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Britain
Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It is dominated by a maritime climate with narrow temperature differences between seasons. The 60% smaller island of Ireland is to the west—these islands, along with over 1,000 smaller surrounding islands and named substantial rocks, form the British Isles archipelago. Connected to mainland Europe until 9,000 years ago by a landbridge now known as Doggerland, Great Britain has been inhabited by modern humans for around 30,000 years. In 2011, it had a population of about , making it the world's third-most-populous island after Java in Indonesia and Honshu in Japan. The term "Great Britain" is often used to refer to England, Scotland and Wales, including their component adjoining islands. Great Britain and Northern Ireland now constitute the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
441 Line
__NOTOC__ Year 441 ( CDXLI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Seleucus without colleague (or, less frequently, year 1194 '' Ab urbe condita''). The denomination 441 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Byzantium * Chrysaphius, chief minister, persuades Emperor Theodosius II at Constantinople to dismiss his sister Pulcheria, for her policy of exiling the Jews, and destroying their synagogues. * Theodosius II sends the Eastern imperial fleet, under the command of the Romano-Goth Areobindus, into Sicilian waters, taking the Vandals by surprise. * Pulcheria leaves for the seaport Hebdomon (Turkey), and becomes a nun to support Nestorianism in the Holy Land ( Palestine). * The Huns, led by Attila, attack ConstanÅ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
