Notes :
Vladimir Kosma Zworykin is usually known as the father of modern television becausethe patent for the electronscanning tube, which is the heart of the TV, was first applied for by Zworykin in 1923. The electron scanning tube was known as iconoscope.
John Logie Baird
In 1925, Scottish inventor Baird produced the first practical demonstration - in Hastings, Sussex - using a tea chest, a hat box, and some cycle lamp lenses! This produced a shadowgraph rather than a full definition image. Theresolution was probably 30 x 30 pixels in modern parlance. This was just enough definition for a human face.
Philo Farnsworth invented the first workingtelevision system in 1927, using electronic scanning for both the cameras and receivers.
Like all complex devices, the television had many contributing inventors.
During the 1870s there were several people who worked on photo-electric devices that converted light into an electrical signal.
1876 was the year that Nipkow patented a rotating disc that could be used to capture and display an image using electricity. Although he had the patent, he never developed a useful working system with the disc and the patent expired some twenty years later.
John Logie Baird , a Scot living in England is recognized as the first to demonstrate an operational television in March of 1925. It was a public demonstration held in Selfridges, a London department store. His"Televisor" system showed moving images being delivered via an electrical signal. The system used the Nipkow disc to produce the imagesso Baird's work was basedon research carried out many years before. Despite the use of the disc,Baird was the first to successfully produce an operational television.
The BBC began public television broadcasts in January 1929 using Baird'ssystem from their London television studio. These continued for seven years until they moved to a newfully electronic system in 1936.
Meanwhile, Philo Farnsworth was workingon similar ideas in Americaand in 1927, he also demonstrated an electro-mechanical television system. Just two years later in 1929, he demonstrated a fully electronic system with no moving parts. This was an important development asthere were significant limitations with the electro-mechanical systems. Farnsworth's electronic system provided a means to increase resolution far beyond that of the Nipkow method.
Vladimir Zworykin , a Russian American filed a patent application in 1923 for the "iconscope", the first electronic camera tube. The patent was eventually granted in 1933. Zworykin worked with RCA during the 1930s and it was RCA whobegan the first commercialbroadcasts of television inthe US in 1939. His Iconscope tube was used for the first few years of broadcasting until it was replaced by more sensitiveand higher resolution tubes during the 1940s.

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