Baird ‘Televisor’ manual

Instruction manual for the Baird ‘Televisor’. The televisor was an electro-mechanical television system that was used by Baird for his 30-line television system from 1929, and trialled by the BBC between 1932 and 1935. It was superseded by the 240 line system trialled at Alexandra Palace, before the all electronic system took over as the dominant format for television.