Fleming diode, British, 1905.

Fleming diode, British, 1905.

Vitamin B12 molecular structure, c 1957-1958.

Messerschmitt KR200 bubble car, c 1960.

Two women looking at fashion display at night, Georgetown, Guyana, 1958.

Celestial globe, 1533-35.

Baird television receiver, 1936.

Sculpture of R J Mitchell, Spitfire exhibition, Science Museum, 2005.

Swis stand at the Great Exhibition, Crystal Palace, London, 1851.

Sculpture of R J Mitchell, Spitfire exhibition, Science Museum, 2005.

Sculpture of R J Mitchell, Spitfire exhibition, Science Museum, 2005.

Baird television receiver, 1936.