who invented television?
Answer:A Scot,John Logie Bairddemonstrated the world's first television system to the public in 1925. He chose Selfridges, a department store in London for the demonstrations. It was the following year that he demonstrated it to the scientific community.His "Televisor" as he called it was a very low resolution and used a rotating disc to generate the image but despite these limitations, it was nonetheless the first moving image to be transmitted electronically. It was sufficiently useful for the BBC to begin broadcasting television from London using the Televisor system in 1929. This was therefore the world's first working television and the world's first public television broadcast.However, the invention of television is far bigger than Baird alone. Ahead of him were a string of scientists and engineers who all made their contributions to the early televisions. Following him were even more who added their expertise to the development of modern television. A few of those who made closely related contributions are mentioned below.Capturing light levels and turning them into an electric signal needed the talents ofJohann Elster and Hans Geitel. These two students in Germany developed the first practical photo electric cell that was able to measure light levels.Paul Nipkow, another German engineer and inventor produced a disc to scan images in 1876. Known as a "Nipkow Disc" it used a set of holes in a spiral formation to scan an image line by line. Although He is credited with the disc, he never used it for moving images and indeed, some claim that he never actually built a working disc at all. He patented the disc but the lack of interest in it meant he allowed the patent to lapse some twenty years later.Daniel Mooreof GEC produced a low voltage modulated neon lamp in 1917 that could be used to vary the output light level.Baird took these three ideas and used each in his Televisor. A photo-electric cell with a rotating disc captured an image while a modulated lamp and another disc displayed the same image.Philo Farnsworthwas working on the same task in America and in 1927 he demonstrated a system similar to Baird's in that it was a mechanical system. by 1929, he had removed all moving parts and revealed the world's first fully electronic television. Although Baird's electro-mechanical system was in public use by this time, it was the electronic system that was to enable low cost manufacturing for the future. Farnsworth's system also allowed higher resolutions to be used compared to the disc based systems.Farnsworth and Baird worked together in the early thirties to further develop the electronic systems and presented a proposal to the BBC for future broadcast systems. The BBC chose an alternative and the Baird-Farnsworth systems never saw use in the UK.Vladimir Zworykin, a Russian American filed a patent application in 1923 for the "Iconscope", the first electronic camera tube. The patent was eventually granted in 1933. Although the tube wasn't used in those early televisions, Zworykin worked with RCA during the 1930s and it was RCA who began the first commercial broadcasts of television in the US in 1939. His Iconscope tube was used for the first few years of broadcasting until it was replaced by more sensitive and higher resolution tubes during the 1940s. The principle of the tube remained in use for half a century before being replace by solid state pick ups.The advent of colorAs soon as black and white television was shown to the world, color television became the goal. Baird, supported by his successful demonstration of television in 1925 began work on the color version and gave a demonstration in 1928 of full color television. It was based on the electro-mechanical system used by his Televisor and never went into commercial production. Nonetheless, ot proved the concept of using red, green and blue signals to capture, deliver and display color television signals. Those principles are still in use today.More than a decade later, Baird demonstrated a fully electronic color system that offered a 600 line resolution. The system once again proved concepts of signal handling and processing that were used for the later successful launch of commercial color services.Later yearsBy the 1940s, television had become big business and the days of the independent inventor had passed. Future developments of color television were carried out by corporations and standards committees with the great inventors of the 1920s pushed to one side. It should be mentioned that despite the great improvements in quality and resolution of television, even now, television uses many of the principles developed by the great inventors, Baird, Farnsworth and Zworykin along with contributions from many others of the early 20th century.