History of television

John Logie Baird gave up his job as an electric-power engineer in 1922 and devoted himself to television research. He produced televised objects in outline in 1924 and recognizable human faces in 1925 and in 1926 became the first person to televise pictures of objects in motion. He demonstrated colour television in 1928. The German post office gave him facilities to develop a television service in 1929. When the BBC television service began  (1936) is system competed with that of Marconi Electric and Musical Industries; the BBC adopted the latter exclusively in 1937.

In its early stages of development, television employed a combination of optical, mechanical and electronic technologies to capture, transmit and display a visual image

In 1884 Paul Gottlieb Nipkow, a 23-year-old university student in Germany, patented the first electromechanical television system which employed a scanning disk, a spinning disk with a series of holes spiraling toward the center, for rasterization

Scottish inventor John Logie Baird demonstrated the transmission of moving silhouette images in London in 1925 and of moving,monochromatic images in 1926.

In 1926, Hungarian engineer Kálmán Tihanyi designed a television system utilizing fully electronic scanning and display elements, and employing the principle of "charge storage" within the scanning (or "camera") tube.

By 1927, Russian inventor Léon Theremin developed a mirror-drum-based television system which used interlacing to achieve an image resolution of 100 lines.

Also in 1927, Herbert E. Ives of Bell Labs transmitted moving images from a 50-aperture disk producing 16 frames per minute over a cable from Washington, DC to New York City, and via radio from Whippany, New Jersey. Ives used viewing screens as large as 24 by 30 inches (60 by 75 centimeters). His subjects included Secretary of Commerce Herbert Hoover.

In 1927, Philo Farnsworth made the world's first working television system with electronic scanning of both the pickup and display devices, which he first demonstrated to the press on 1 September 1928.