موضوع عن اختراع التلفاز بالانجليزي

موضوع عن اختراع التلفاز بالانجليزي موضوع عن Television

تعبير انجليزي عن اختراع

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تلفزيون الانترنت تعبير عن التلفزيون بالانجليزي برزنتيشن موضوع عن اختراع التلفاز بالانجليزي اختراع بسيط بالانجليزي موضوع عن اختراع  بالانجليزي قصير تعبير انجليزي عن اي اختراع ثالث متوسط تعبير او براجراف انجليزي عن التلفزيون

نص عن التلفاز انجليزي موضوع عن بالانقلش موضوع عن اختراع التلفاز بالانجليزي

The invention of television (1926)

television

The year 1926 saw the first public broadcast of television images by the Scotsman John Baird. It is the culmination of a long journey of discoveries and inventions made in the late nineteenth century. Among the precursors of the invention of television, Willoughby Smith, who showed the photoconductivity of selenium in 1873. In 1880, the French Maurice Leblanc indicated the principles of television as we know it today.

The invention of television

In 1884, the German engineer Paul Nipkow made the first rapid scanning system, a system that was quickly perfected with the invention of the photocell by Germans Julius Elster and Hans Geitel in 1889. compatriot Karl Ferdinand Braun develops a crucial invention, the cathode ray tube, in 1897. For his scientific work, he will receive the Nobel Prize in physics in 1909.

Following the public demonstration by Baird in 1926, Russian-born American Vladimir Zworykin unveiled his kinescope, where the CRT screen became the TV's small screen. This more modern and coherent device is adopted, especially by the English company EMI, and operated by the BBC in 1936. It exceeds the Tele-visor, the first consumer television, which Baird marketed without much success in 1930. The first receivers are marketed in the United States in 1941; color television will be there in 1953 (in Europe, in the early 1960s). Relay satellites provide long-distance transmissions

The birth of television

In 1923, Vladimir Zworykin, a Russian emigrated to the United States, is the first to file an "all-electronic" television patent. It will have to wait 15 years before obtaining approval, having failed to demonstrate the practical use of his invention.

He also contributed to major advances in cathode television by developing a picture tube called iconoscope, in 1933.

Another pioneer of this technology is the Scottish engineer John Logie Baird, who succeeded in 1924 to reproduce on a screen simple geometric shapes.

He was also the first to produce a televised image of moving objects. On January 27, 1926, he demonstrated his invention, which he called "television", in front of the Royal Institution in London.

In 1930, he commercialized the first consumer TV receiver.

The beginnings of TV

The BBC premiered its First Channel in 1936.

It is to John Baird, the inventor of the mechanical television, that we also owe the invention of color television.

He made an experimental demonstration on February 17, 1938 at the Dominion Theater in London.

In France, the first televised direct was in 1950: a piece of Marivaux was broadcast live, on the only chain of the time.