Philo T. Farnsworth
Farnsworth in 1939
Philo Taylor Farnsworth
August 19, 1906
|Died||March 11, 1971 (aged 64)|
Salt Lake City, Utah
|Resting place||Provo City Cemetery,|
|Employer||Philco, Farnsworth Television and Radio Corporation, International Telephone and Telegraph|
|Known for||Inventor of the first fully electronic television; over 169 United States and foreign patents|
|Spouse(s)||Elma "Pem" Gardner (1926–71; his death)|
|Relatives||Agnes Ann Farnsworth (sister)|
Philo Taylor Farnsworth (August 19, 1906 – March 11, 1971) was an American inventor and television pioneer.He made many crucial contributions to the early development of all-electronic television. He is best known for his 1927 invention of the first fully functional all-electronic image pickup device (video camera tube), the image dissector , as well as the first fully functional and complete all-electronic television system. Farnsworth developed a television system complete with receiver and camera—which he produced commercially through the Farnsworth Television and Radio Corporation from 1938 to 1951, in Fort Wayne, Indiana.
Video camera tubes were devices based on the cathode ray tube that were used to capture television images prior to the introduction of charge-coupled devices (CCDs) in the 1980s. Several different types of tubes were in use from the early 1930s to the 1980s.
An image dissector, also called a dissector tube, is a video camera tube in which photocathode emissions create an "electron image" which is then scanned to produce an electrical signal representing the visual image. The term may apply specifically to a dissector tube employing magnetic fields to keep the electron image in focus, and an electron multiplier to scan the electrons. Dissectors were used only briefly in television systems before being replaced by the much more sensitive iconoscope during the 1930s.
In later life, Farnsworth invented a small nuclear fusion device, the Farnsworth–Hirsch fusor, employing inertial electrostatic confinement (IEC). It was not a practical device for generating nuclear power, though it provides a viable source of neutrons.The design of this device has been the inspiration for other fusion approaches, including the Polywell reactor concept. Farnsworth held 300 patents, mostly in radio and television.
In nuclear chemistry, nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles. The difference in mass between the reactants and products is manifested as either the release or absorption of energy. This difference in mass arises due to the difference in atomic "binding energy" between the atomic nuclei before and after the reaction. Fusion is the process that powers active or "main sequence" stars, or other high magnitude stars.
A fusor is a device that uses an electric field to heat ions to nuclear fusion conditions. The machine makes a voltage between two metal cages, inside a vacuum. Positive ions fall down this voltage drop, building up speed. If they collide in the center, they can fuse. This is one kind of an inertial electrostatic confinement device – a branch of fusion research.
Inertial electrostatic confinement is a branch of fusion research that uses an electric field to elevate a plasma to fusion conditions. Electric fields can do work on charged particles, heating/confining them to fusion conditions. This is typically done in a sphere, with material moving radially inward, but can also be done in a cylindrical or beam geometry. The electric field can be generated using a wire grid or a non-neutral plasma cloud.
Farnsworth was born August 19, 1906, the eldest of five children 240-acre (1.0 km2) ranch near Rigby, Idaho, where his father supplemented his farming income by hauling freight with his horse-drawn wagon. Philo was excited to find that his new home was wired for electricity, with a Delco generator providing power for lighting and farm machinery. He was a quick student in mechanical and electrical technology, repairing the troublesome generator. He found a burned-out electric motor among some items discarded by the previous tenants and rewound the armature; he converted his mother's hand-powered washing machine into an electric-powered one. He developed an early interest in electronics after his first telephone conversation with a distant relative, and he discovered a large cache of technology magazines in the attic of their new home. He won $25 in a pulp-magazine contest for inventing a magnetized car lock. Farnsworth was Mormon.of Lewis Edwin Farnsworth and Serena Amanda Bastian, a Mormon couple living in a small log cabin built by Lewis's father near Beaver, Utah. In 1918, the family moved to a relative's
Beaver is a city in eastern Beaver County, Utah, United States. It is also serves as the county seat. The population was 3,112 at the 2010 census. It is the county seat of Beaver County.
Rigby is a small city in and the county seat of Jefferson County, Idaho, United States. The population was 3,945 at the 2010 census, up from 2,998 in 2000.
Farnsworth excelled in chemistry and physics at Rigby High School. He asked science teacher Justin Tolman for advice about an electronic television system that he was contemplating; he provided the teacher with sketches and diagrams covering several blackboards to show how it might be accomplished electronically, and Tolman encouraged him to develop his ideas.One of the drawings that he did on a blackboard for his chemistry teacher was recalled and reproduced for a patent interference case between Farnsworth and RCA.
Rigby High School is a four-year public high school in the western United States, located in Rigby, Idaho. Part of the Jefferson County Joint School District #251, the approximate enrollment is 1,600 students in grades 9 to 12, from Rigby and surrounding communities. The school colors of RHS are maroon, white, and gold, and the mascot is a Trojan.
The RCA Corporation was a major American electronics company, which was founded as the Radio Corporation of America in 1919. It was initially a wholly owned subsidiary of General Electric (GE); however, in 1932, RCA became an independent company after GE was required to divest its ownership as part of the settlement of a government antitrust suit.
In 1923, the family moved to Provo, Utah, and Farnsworth attended Brigham Young High School that fall. His father died of pneumonia in January 1924 at age 58, and Farnsworth assumed responsibility for sustaining the family while finishing high school.After graduating BYHS in June 1924, he applied to the United States Naval Academy in Annapolis, Maryland, where he earned the nation's second-highest score on academy recruiting tests. However, he was already thinking ahead to his television projects; he learned that the government would own his patents if he stayed in the military, so he obtained an honorable discharge within months of joining under a provision in which the eldest child in a fatherless family could be excused from military service to provide for his family. He returned to Provo and enrolled at Brigham Young University, but he was not allowed by the faculty to attend their advanced science classes based upon policy considerations. He attended anyway and made use of the university's research labs, and he earned a Junior Radio-Trician certification from the National Radio Institute, with a full certification in 1925. While attending college, he met Provo High School student Elma "Pem" Gardner, (February 25, 1908 – April 27, 2006), whom he eventually married.
Provo is the third-largest city in Utah, United States. It is 43 miles (69 km) south of Salt Lake City along the Wasatch Front. Provo is the largest city and county seat of Utah County.
Brigham Young High School was a private high school in Provo, Utah, United States, first known as Brigham Young Academy (BYA). The school later became attached to Brigham Young University (BYU) with its official name being Brigham Young University High School, and commonly called B Y High. It operated under the Church Educational System of The Church of Jesus Christ of Latter-day Saints.
The United States Naval Academy is a four-year coeducational federal service academy adjacent to Annapolis, Maryland. Established on 10 October 1845, under Secretary of the Navy George Bancroft, it is the second oldest of the United States' five service academies, and educates officers for commissioning primarily into the United States Navy and United States Marine Corps. The 338-acre (137 ha) campus is located on the former grounds of Fort Severn at the confluence of the Severn River and Chesapeake Bay in Anne Arundel County, 33 miles (53 km) east of Washington, D.C. and 26 miles (42 km) southeast of Baltimore. The entire campus is a National Historic Landmark and home to many historic sites, buildings, and monuments. It replaced Philadelphia Naval Asylum, in Philadelphia, that served as the first United States Naval Academy from 1838 to 1845 when the Naval Academy formed in Annapolis.
Farnsworth worked while his sister Agnes took charge of the family home and the second-floor boarding house, with the help of a cousin living with the family. The Farnsworths later moved into half of a duplex, with family friends the Gardners moving into the other side when it became vacant.He developed a close friendship with Pem's brother Cliff Gardner, who shared his interest in electronics, and the two moved to Salt Lake City to start a radio repair business. The business failed, and Gardner returned to Provo.
Salt Lake City is the capital and the most populous municipality of the U.S. state of Utah. With an estimated population of 190,884 in 2014, the city is the core of the Salt Lake City metropolitan area, which has a population of 1,153,340. Salt Lake City is further situated within a larger metropolis known as the Salt Lake City–Ogden–Provo Combined Statistical Area. This region is a corridor of contiguous urban and suburban development stretched along an approximately 120-mile (190 km) segment of the Wasatch Front, comprising a population of 2,423,912 as of 2014. It is one of only two major urban areas in the Great Basin.
Farnsworth remained in Salt Lake City and became acquainted with Leslie Gorrell and George Everson, a pair of San Francisco philanthropists who were then conducting a Salt Lake City Community Chest fund-raising campaign.They agreed to fund his early television research with an initial $6,000 in backing, and set up a laboratory in Los Angeles for Farnsworth to carry out his experiments.
Farnsworth married Pemon May 27, 1926, and the two traveled to Berkeley, California, in a Pullman coach. They moved across the bay to San Francisco where Farnsworth set up his new lab at 202 Green Street. It was at this time that he received his first television patent.
A few months after arriving in California, Farnsworth was prepared to show his models and drawings to a patent attorney who was nationally recognized as an authority on electrophysics. Everson and Gorrell agreed that Farnsworth should apply for patents for his designs, a decision that proved crucial in later disputes with RCA.Most television systems in use at the time used image scanning devices ("rasterizers") employing rotating "Nipkow disks" comprising a spinning disk with holes arranged in spiral patterns such that they swept across an image in a succession of short arcs while focusing the light they captured on photosensitive elements, thus producing a varying electrical signal corresponding to the variations in light intensity. Farnsworth recognized the limitations of the mechanical systems, and that an all-electronic scanning system could produce a superior image for transmission to a receiving device.
On September 7, 1927, Farnsworth's image dissector camera tube transmitted its first image, a simple straight line, to a receiver in another room of his laboratory at 202 Green Street in San Francisco.Pem Farnsworth recalled in 1985 that her husband broke the stunned silence of his lab assistants by saying, "There you are – electronic television!" The source of the image was a glass slide, backlit by an arc lamp. An extremely bright source was required because of the low light sensitivity of the design. By 1928, Farnsworth had developed the system sufficiently to hold a demonstration for the press. His backers had demanded to know when they would see dollars from the invention; so the first image shown was, appropriately, a dollar sign. In 1929, the design was further improved by elimination of a motor-generator; so the television system now had no mechanical parts. That year Farnsworth transmitted the first live human images using his television system, including a three and a half-inch image of his wife Pem.
Many inventors had built electromechanical television systems before Farnsworth's seminal contribution, but Farnsworth designed and built the world's first working all-electronic television system, employing electronic scanning in both the pickup and display devices. He first demonstrated his system to the press on September 3, 1928,and to the public at the Franklin Institute in Philadelphia on August 25, 1934.
In 1930, RCA recruited Vladimir Zworykin—who had tried, unsuccessfully, to develop his own all-electronic television system at Westinghouse in Pittsburgh since 1923—to lead its television development department. Before leaving his old employer, Zworykin visited Farnsworth's laboratory, and was sufficiently impressed with the performance of the Image Dissector that he reportedly had his team at Westinghouse make several copies of the device for experimentation. Zworykin later abandoned research on the Image Dissector, which at the time required extremely bright illumination of its subjects, and turned his attention to what became the Iconoscope. In a 1970s series of videotaped interviews, Zworykin recalled that, "Farnsworth was closer to this thing you're using now [i.e., a video camera] than anybody, because he used the cathode-ray tube for transmission. But, Farnsworth didn't have the mosaic [of discrete light elements], he didn't have storage. Therefore, [picture] definition was very low.... But he was very proud, and he stuck to his method." Contrary to Zworykin's statement, Farnsworth's patent #2,087,683 for the Image Dissector (filed April 26, 1933) features the "charge storage plate" invented by Tihanyi in 1928 and a "low velocity" method of electron scanning, also describes "discrete particles" whose "potential" is manipulated and "saturated" to varying degrees depending on their velocity. Farnsworth's patent numbers 2,140,695 and 2,233,888 are for a "charge storage dissector" and "charge storage amplifier," respectively.
In 1931, David Sarnoff of RCA offered to buy Farnsworth's patents for US$100,000, with the stipulation that he become an employee of RCA, but Farnsworth refused.In June of that year, Farnsworth joined the Philco company and moved to Philadelphia along with his wife and two children. RCA later filed an interference suit against Farnsworth, claiming Zworykin's 1923 patent had priority over Farnsworth's design, despite the fact it could present no evidence that Zworykin had actually produced a functioning transmitter tube before 1931. Farnsworth had lost two interference claims to Zworykin in 1928, but this time he prevailed and the U.S. Patent Office rendered a decision in 1934 awarding priority of the invention of the image dissector to Farnsworth. RCA lost a subsequent appeal, but litigation over a variety of issues continued for several years with Sarnoff finally agreeing to pay Farnsworth royalties. Zworykin received a patent in 1928 for a color transmission version of his 1923 patent application; he also divided his original application in 1931, receiving a patent in 1935, while a second one was eventually issued in 1938 by the Court of Appeals on a non-Farnsworth-related interference case, and over the objection of the Patent Office.
In 1932, while in England to raise money for his legal battles with RCA, Farnsworth met with John Logie Baird, a Scottish inventor who had given the world's first public demonstration of a working television system in London in 1926, using an electro-mechanical imaging system, and who was seeking to develop electronic television receivers. Baird demonstrated his mechanical system for Farnsworth.
In May 1933, Philco severed its relationship with Farnsworth because, said Everson, "it [had] become apparent that Philo's aim at establishing a broad patent structure through research [was] not identical with the production program of Philco."In Everson's view the decision was mutual and amicable. Farnsworth set up shop at 127 East Mermaid Lane in Philadelphia, and In 1934 held the first public exhibition of his device at the Franklin Institute in that city.
After sailing to Europe in 1934, Farnsworth secured an agreement with Goerz-Bosch-Fernseh in Germany.Some image dissector cameras were used to broadcast the 1936 Olympic Games in Berlin.
Farnsworth returned to his laboratory, and by 1936 his company was regularly transmitting entertainment programs on an experimental basis.That same year, while working with University of Pennsylvania biologists, Farnsworth developed a process to sterilize milk using radio waves. He also invented a fog-penetrating beam for ships and airplanes.
In 1936 he attracted the attention of Collier's Weekly , which described his work in glowing terms. "One of those amazing facts of modern life that just don't seem possible – namely, electrically scanned television that seems destined to reach your home next year, was largely given to the world by a nineteen-year-old boy from Utah ... Today, barely thirty years old he is setting the specialized world of science on its ears."
In 1938, Farnsworth established the Farnsworth Television and Radio Corporation in Fort Wayne, Indiana, with E. A. Nicholas as president and himself as director of research. million. RCA was then free, after showcasing electronic television at New York World's Fair on April 20, 1939, to sell electronic television cameras to the public. :250–54In September 1939, after a more than decade-long legal battle, RCA finally conceded to a multi-year licensing agreement concerning Farnsworth's 1927 patent for television totaling $1
Farnsworth Television and Radio Corporation was purchased by International Telephone and Telegraph (ITT) in 1951. During his time at ITT, Farnsworth worked in a basement laboratory known as "the cave" on Pontiac Street in Fort Wayne. From there he introduced a number of breakthrough concepts, including a defense early warning signal, submarine detection devices, radar calibration equipment and an infrared telescope. "Philo was a very deep person – tough to engage in conversation, because he was always thinking about what he could do next", said Art Resler, an ITT photographer who documented Farnsworth's work in pictures.One of Farnsworth's most significant contributions at ITT was the PPI Projector, an enhancement on the iconic "circular sweep" radar display, which allowed safe air traffic control from the ground. This system developed in the 1950s was the forerunner of today's air traffic control systems.
In addition to his electronics research, ITT management agreed to nominally fund Farnsworth's nuclear fusion research. He and staff members invented and refined a series of fusion reaction tubes called "fusors". For scientific reasons unknown to Farnsworth and his staff, the necessary reactions lasted no longer than thirty seconds. In December 1965, ITT came under pressure from its board of directors to terminate the expensive project and sell the Farnsworth subsidiary. It was only due to the urging of president Harold Geneen that the 1966 budget was accepted, extending ITT's fusion research for an additional year. The stress associated with this managerial ultimatum, however, caused Farnsworth to suffer a relapse. A year later he was terminated and eventually allowed medical retirement.
In the spring of 1967, Farnsworth and his family moved back to Utah to continue his fusion research at Brigham Young University, which presented him with an honorary doctorate. The university also offered him office space and an underground concrete bunker for the project. Realizing ITT would dismantle its fusion lab, Farnsworth invited staff members to accompany him to Salt Lake City, as team members in Philo T. Farnsworth Associates (PTFA). By late 1968, the associates began holding regular business meetings and PTFA was underway. They promptly secured a contract with the National Aeronautics and Space Administration (NASA), and more possibilities were within reach—but financing stalled for the $24,000 a month required for salaries and equipment rental.
By Christmas 1970, PTFA had failed to secure the necessary financing, and the Farnsworths had sold all their own ITT stock and cashed in Philo's life insurance policy to maintain organizational stability. The underwriter had failed to provide the financial backing that was to have supported the organization during its critical first year. The banks called in all outstanding loans, repossession notices were placed on anything not previously sold, and the Internal Revenue Service put a lock on the laboratory door until delinquent taxes were paid. In January 1971, PTFA disbanded. Farnsworth had begun abusing alcohol in his later years,and as a result became seriously ill with pneumonia, and died on March 11, 1971.
Farnsworth's wife Elma Gardner "Pem" Farnsworth fought for decades after his death to assure his place in history. Farnsworth always gave her equal credit for creating television, saying, "my wife and I started this TV." She died on April 27, 2006, at age 98.The inventor and wife were survived by two sons, Russell (then living in New York City), and Kent (then living in Fort Wayne, Indiana).
In 1999, Time magazine included Farnsworth in the "Time 100: The Most Important People of the Century".
Farnsworth worked out the principle of the image dissector in the summer of 1921, not long before his fifteenth birthday, and demonstrated the first working version on September 7, 1927, having turned 21 the previous August. A farm boy, his inspiration for scanning an image as series of lines came from the back-and-forth motion used to plow a field. [ citation needed ]In the course of a patent interference suit brought by the Radio Corporation of America in 1934 and decided in February 1935, his high school chemistry teacher, Justin Tolman, produced a sketch he had made of a blackboard drawing Farnsworth had shown him in spring 1922. Farnsworth won the suit; RCA appealed the decision in 1936 and lost. Farnsworth received royalties from RCA, but he never became wealthy. The video camera tube that evolved from the combined work of Farnsworth, Zworykin, and many others was used in all television cameras until the late 20th century, when alternate technologies such as charge-coupled devices began to appear.
Farnsworth also developed the "image oscillite", a cathode ray tube that displayed the images captured by the image dissector.
Farnsworth called his device an image dissector because it converted individual elements of the image into electricity one at a time. He replaced the spinning disks with caesium, an element that emits electrons when exposed to light.
In 1984, Farnsworth was inducted into the National Inventors Hall of Fame.
The Farnsworth–Hirsch fusor is an apparatus designed by Farnsworth to create nuclear fusion. Unlike most controlled fusion systems, which slowly heat a magnetically confined plasma, the fusor injects high-temperature ions directly into a reaction chamber, thereby avoiding a considerable amount of complexity.
When the Farnsworth-Hirsch fusor was first introduced to the fusion research world in the late 1960s, the fusor was the first device that could clearly demonstrate it was producing fusion reactions at all. Hopes at the time were high that it could be quickly developed into a practical power source. However, as with other fusion experiments, development into a power source has proven difficult. Nevertheless, the fusor has since become a practical neutron source and is produced commercially for this role.
At the time he died, Farnsworth held 300 U.S. and foreign patents. His inventions contributed to the development of radar, infra-red night vision devices, the electron microscope, the baby incubator, the gastroscope, and the astronomical telescope.
Although he was the man responsible for its technology, Farnsworth appeared only once on a television program. On July 3, 1957, he was a mystery guest ("Doctor X") on the CBS quiz show I've Got A Secret . He fielded questions from the panel as they unsuccessfully tried to guess his secret ("I invented electronic television."). For stumping the panel, he received $80 and a carton of Winston cigarettes.Host Garry Moore then spent a few minutes discussing with Farnsworth his research on such projects as high-definition television, flat-screen receivers, and fusion power. Farnsworth said, "There had been attempts to devise a television system using mechanical disks and rotating mirrors and vibrating mirrors—all mechanical. My contribution was to take out the moving parts and make the thing entirely electronic, and that was the concept that I had when I was just a freshman in high school in the Spring of 1921 at age 14." When Moore asked about others' contributions, Farnsworth agreed, "There are literally thousands of inventions important to television. I hold something in excess of 165 American patents." The host then asked about his current research, and the inventor replied, "In television, we're attempting first to make better utilization of the bandwidth, because we think we can eventually get in excess of 2,000 lines instead of 525 ... and do it on an even narrower channel ... which will make for a much sharper picture. We believe in the picture-frame type of a picture, where the visual display will be just a screen. And we hope for a memory, so that the picture will be just as though it's pasted on there."
A letter to the editor of the Idaho Falls Post Register disputed that Farnsworth had made only one television appearance. Roy Southwick claimed "... I interviewed Mr. [Philo] Farnsworth back in 1953—the first day KID-TV went on the air."KID-TV, which later became KIDK-TV, was then located near the Rigby area where Farnsworth grew up.
In a 1996 videotaped interview by the Academy of Television Arts & Sciences, Elma Farnsworth recounts Philo's change of heart about the value of television, after seeing how it showed man walking on the moon, in real time, to millions of viewers:
In 2010, the former Farnsworth factory in Fort Wayne, Indiana, was razed,eliminating the "cave," where many of Farnsworth's inventions were first created, and where its radio and television receivers and transmitters, television tubes, and radio-phonographs were mass-produced under the Farnsworth, Capehart, and Panamuse trade names. The facility was located at 3702 E. Pontiac St.
Also that year, additional Farnsworth factory artifacts were added to the Fort Wayne History Center's collection, including a radio-phonograph and three table-top radios from the 1940s, as well as advertising and product materials from the 1930s to the 1950s.
Farnsworth's Fort Wayne residence from 1948–1967, then the former Philo T. Farnsworth Television Museum, stands at 734 E. state Boulevard, on the southwest corner of E. State and St. Joseph Boulevards. The residence is recognized by an Indiana state historical marker and was listed on the National Register of Historic Places in 2013.
In addition to Fort Wayne, Farnsworth operated a factory in Marion, Indiana, that made shortwave radios used by American combat soldiers in World War II.Acquired by RCA after the war, the facility was located at 3301 S. Adams St.
Television (TV), sometimes shortened to tele or telly, is a telecommunication medium used for transmitting moving images in monochrome, or in colour, and in two or three dimensions and sound. The term can refer to a television set, a television program, or the medium of television transmission. Television is a mass medium for advertising, entertainment and news.
John Logie BairdFRSE was a Scottish engineer, innovator, one of the inventors of the mechanical television, demonstrating the first working television system on 26 January 1926, and inventor of both the first publicly demonstrated colour television system, and the first purely electronic colour television picture tube.
Jack St. Clair Kilby was an American electrical engineer who took part in the realization of the first integrated circuit while working at Texas Instruments (TI) in 1958. He was awarded the Nobel Prize in Physics on December 10, 2000. To congratulate him, American President Bill Clinton wrote, "You can take pride in the knowledge that your work will help to improve lives for generations to come."
David Sarnoff was a Russian emigrant, an American businessman and pioneer of American radio and television. Throughout most of his career he led the Radio Corporation of America (RCA) in various capacities from shortly after its founding in 1919 until his retirement in 1970.
Vladimir Kosmich Zworykin was a Russian-born American inventor, engineer, and pioneer of television technology. Educated in Russia and in France, he spent most of his life in the United States. Zworykin invented a television transmitting and receiving system employing cathode ray tubes. He played a role in the practical development of television from the early thirties, including charge storage-type tubes, infrared image tubes and the electron microscope.
Charles Francis Jenkins was an American pioneer of early cinema and one of the inventors of television, though he used mechanical rather than electronic technologies. His businesses included Charles Jenkins Laboratories and Jenkins Television Corporation. Over 400 patents were issued to Jenkins, many for his inventions related to motion pictures and television.
Boris Lvovich Rosing was a Russian scientist and inventor in the field of 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, to scan the scene and generate the video signal, and a similar mechanical device at the receiver to display the picture. This contrasts with modern television technology, which uses electronic scanning methods, for example electron beams in cathode ray tube (CRT) televisions, and liquid-crystal displays (LCD), to create and display the picture.
The Farnsworth Invention is a stage play by Aaron Sorkin adapted from an unproduced screenplay about Philo Farnsworth's first fully functional and completely all-electronic television system and David Sarnoff, the RCA president who stole the design.
The intermediate film system was a television process in which motion picture film was processed almost immediately after it was exposed in a camera, then scanned by a television scanner, and transmitted over the air. This system was used principally in Britain and Germany where television cameras were not sensitive enough to use reflected light, but could transmit a suitable image when a bright light was shown through motion picture film directly into the camera lens. John Logie Baird began developing the process in 1932, borrowing the idea of Georg Oskar Schubert from his licensees in Germany, where it was demonstrated by Fernseh AG in 1932 and used for broadcasting in 1934. The BBC used Baird's version of the process during the first three months of its then-"high-definition" television service from November 1936 through January 1937, and German television used it during broadcasts of the 1936 Summer Olympics. In both cases, intermediate film cameras alternated with newly introduced direct television cameras.
The Iconoscope was the first practical video camera tube to be used in early television cameras. The iconoscope produced a much stronger signal than earlier mechanical designs, and could be used under any well-lit conditions. This was the first fully electronic system to replace earlier cameras, which used special spotlights or spinning disks to capture light from a single very brightly lit spot.
The history of telecommunication began with the use of smoke signals and drums in Africa, the Americas and parts of Asia. In the 1790s, the first fixed semaphore systems emerged in Europe; however it was not until the 1830s that electrical telecommunication systems started to appear. This article details the history of telecommunication and the individuals who helped make telecommunication systems what they are today. The history of telecommunication is an important part of the larger history of communication.
The invention of the television was the work of many individuals in the late 19th century and early 20th century. Individuals and corporations competed in various parts of the world to deliver a device that superseded previous technology. Many were compelled to capitalize on the invention and make profit, while some wanted to change the world through visual and audio communication technology.
Kálmán Tihanyi was a Hungarian physicist, electrical engineer and inventor. One of the early pioneers of electronic television, he made significant contributions to the development of cathode ray tubes (CRTs), which were bought and further developed by the Radio Corporation of America, and German companies Loewe and Fernseh AG. He invented and designed the world's first automatic pilotless aircraft in Great Britain.
Boris Pavlovich Grabovsky was a Soviet engineer who invented a first fully electronic TV set that was demonstrated in 1928. In 1925, one of the pioneers of television Boris Rosing advised and helped him apply for a patent of a fully electronic TV set called Telefot.
George H. Sweigert (1920–1999) is widely credited as the first inventor to hold a patent for the invention of the cordless telephone. Google Patents link.
Jan Aleksander Rajchman was a Polish electrical engineer and computer pioneer.
Philo Farnsworth, one of several inventors of television, was another Mormon media engineer.
|Wikiquote has quotations related to: Philo Farnsworth|
|Wikimedia Commons has media related to Philo Taylor Farnsworth .|