TELEVISION

Television first started as a Silhouette images before changes and improvements. In 1925, John Logie Baird (Scotland) demonstration of Silhouette images in London to be the first television pictures. The BBC initially adopted his mechanical system but replaced it in 1937 with Marconi/EMI’s electronic one. Television works by converting pictures and sound into a signal, which is transmitted through air, received by an aerial and decoded back into pictures and sound. The cathode ray tube was a key component in the invention of television. It created the images and gave early sets their curved screens.

Something to Ponder Upon…

On 26 January 1926, Baird repeated the transmission for members of the Royal Institution and a reporter from The Times in his laboratory at 22 Frith Street in the Soho district of London. By this time, he had improved the scan rate to 12.5 pictures per second. It was the first demonstration of a television system that could broadcast live moving images with tone graduation.

He demonstrated the world’s first colour transmission on 3 July 1928, using scanning discs at the transmitting and receiving ends with three spirals of apertures, each spiral with a filter of a different primary colour; and three light sources at the receiving end, with a commutator to alternate their illumination. That same year he also demonstrated stereoscopic television.

In 1932, Baird was the first person in the United Kingdom to demonstrate ultra-short wave transmissions. (Today, we refer to “ultra-short waves” as the VHF band.) Contrary to some reports, these transmissions were far from the first VHF telecasts. In 1931, the US Federal Radio Commission allocated VHF television bands. From 1931 to 1933, station W9XD in Milwaukee, Wisconsin, transmitted some of the first VHF television signals. The station’s 45-line, triply interlaced pictures used the U. A. Sanabria television technology.