The BBC's test broadcasts continued throughout the early part of the decade as the quality of the medium improved. In 1936 the BBC launched the world's first "high-definition"—then defined as at least 240-lines — television channel, the BBC Television Service, from studios in a specially converted wing of Alexandra Palace in London. At the time of the channel's debut on 2 November 1936 there were only five television producers responsible for the entire output. The producer selected to oversee drama was George More O'Ferrall, who had some experience with working in a visual medium as he was a former assistant director of films. This was unlike most of his colleagues, who came across from the BBC's radio services.