 basically the French, Russians, US and British all worked on various vital bits. The BBC set up a committee in 1935 to help decide between two electronic TV systems, a Baird 240-line system and an EMI system with 405 lines. The 405 line system was chosen as it worked better. Content for the network was captured using Marconi's Emitron camera 1 http://www.earlytelevision.org/mechanical_tv.htm Making Telecoms Work: From Technical Innovation to Commercial Success, First Edition. Geoff Varrall. © 2012 John Wiley & Sons, Ltd. Published 2012 by John Wiley & Sons, Ltd. Making Telecoms Work Figure 6.1 Bush TV 22 in production between 1950 and 1952. Reproduced with the permission of the Science Museum/SSPL. system. 2 Three of these cameras were installed at Hyde Park corner to record the coronation of George V1 in May 1937. The cameras were connected via a lead-sheathed copper cable to Alexandra Palace, a massive undertaking for an audience estimated as at most 10 000 people. In the US the RCA Victor Company introduced electronic television at the 1939 World Fair though even by 1940 there were only 2000 or SO sets in use. During the war the UK stopped TV broadcasting as it was considered that the VHF transmis- sion could be used by the German air force for direction finding. Postwar 405-line broadcasts started again and carried on until 3 January 1985 in the VHF band (Bands 1, 11 and 111 between 30 and 300 MHz). Band 111 was then reallocated to private mobile radio and later to digital audio broadcasting. After the Second World War the BBC built a number of regional transmitters each on a different 8 MHz channel. The Bush Radio Company (named after the location of the original factory in Shepherd's Bush) produced the model in Figure 6.1 between 1950 and 1952. It was one of the first televisions capable of being retuned if the owner moved house. It featured a nine-inch screen and an aluminised cathode ray tube that meant that more of the light from the picture came into the room, producing a brighter image. 625-line/50-Hz