Perskyi's paper reviewed the existing electromechanical technologies, mentioning the work of Nipkow and others.The first demonstration of the live transmission of images was by Georges Rignoux and A. A matrix of 64 selenium cells, individually wired to a mechanical commutator, served as an electronic retina.As a 23-year-old German university student, Paul Julius Gottlieb Nipkow proposed and patented the Nipkow disk in 1884.This was a spinning disk with a spiral pattern of holes in it, so each hole scanned a line of the image.The Anglicised version of the term is first attested in 1907, when it was still "...a theoretical system to transmit moving images over telegraph or telephone wires". The slang term "the tube" or the "boob tube" refers to the bulky cathode ray tube used on most TVs until the advent of flat-screen TVs. Facsimile transmission systems for still photographs pioneered methods of mechanical scanning of images in the early 19th century.Alexander Bain introduced the facsimile machine between 18.Frederick Bakewell demonstrated a working laboratory version in 1851.
In 1911, Boris Rosing and his student Vladimir Zworykin created a system that used a mechanical mirror-drum scanner to transmit, in Zworykin's words, "very crude images" over wires to the "Braun tube" (cathode ray tube or "CRT") in the receiver.A standard television set is composed of multiple internal electronic circuits, including a tuner for receiving and decoding broadcast signals.A visual display device which lacks a tuner is correctly called a video monitor rather than a television.Another development was the move from standard-definition television (SDTV) (576i, with 576 interlaced lines of resolution and 480i) to high-definition television (HDTV), which provides a resolution that is substantially higher.HDTV may be transmitted in various formats: 1080p, 1080i and 720p.Moving images were not possible because, in the scanner: "the sensitivity was not enough and the selenium cell was very laggy".By the 1920s, when amplification made television practical, Scottish inventor John Logie Baird employed the Nipkow disk in his prototype video systems.Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound.The term can refer to a television set, a television program ("TV show"), or the medium of television transmission.For many reasons, especially the convenience of remote retrieval, the storage of television and video programming now occurs on the cloud.At the end of the first decade of the 2000s, digital television transmissions greatly increased in popularity.