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A selenium photoelectric tube detected the light reflected from the subject and converted it into a proportional electrical signal.This was transmitted by AM radio waves to a receiver unit, where the video signal was applied to a neon light behind a second Nipkow disk rotating synchronized with the first.
He also started work on the first color television.
On March 25, 1925, Baird gave the first public demonstration of televised silhouette images in motion, at Selfridge's Department Store in London.
In 1932, he demonstrated ultra-short wave television.
Baird's mechanical system reached a peak of 240 lines of resolution on BBC television broadcasts in 1936, though the mechanical system did not scan the televised scene directly.
In November of the same year, Baird and Bernard Natan of Pathé established France's first television company, Télévision-Baird-Natan.
In 1931, he made the first outdoor remote broadcast, of The Derby.
The invention of the television was the work of many individuals in the late 19th and early 20th centuries.
Individuals and corporations competed in various parts of the world to deliver a device that superseded previous technology.
The Scottish inventor Alexander Bain introduced the facsimile machine between 18.
The English physicist Frederick Bakewell demonstrated a working laboratory version in 1851.