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Baird inventing his television. Coloured photograph of the Scottish engineer John Logie Baird (1888-1946) constructing one of his early television systems. This was built using various scrap materials, including an old tea chest, an empty biscuit box, bicycle lenses, hat boxes, bits of cardboard, and secondhand wirelesses and electric motors. The system was held together with glue, sealing wax and string. Baird demonstrated his invention to the Royal Institution in 1926. Original photograph published in Television (Dinsdale, 1928). (KEYSTONE/SCIENCE PHOTO LIBRARY/SHEILA TERRY)