John Logie Baird, the Scottish inventor, developed an electromechanical TV system in the 1920s and gave frequent public demonstrations. The publicity encouraged EMI to develop a practical all-electronic system, similar to today's. In 1936 the BBC transmitted both systems, but EMI's was judged superior. Episode Contents: Models: TV scanning is demonstrated with a drawing made on many strands of string. A cutaway TV and cards that mimic the screening of a colour TV. Explanation of the simplest electronic components. Machines: Tim's displays at the National Film and Television Museum (UK) Guests: British TV sets from before and after WWII. Films: Zworykin interview. J.L. Baird cartoon. Extro: A mountain of live televisions set on fire.