Mainframe computer at the VAT office, Southend-on-Sea, Essex, 1970s.

IBM 1410 computer in use at Ford Motor Company, c 1969.

Pair of early Bell telephones, 1878.

Plan of the analytical engine, 1840.

Charles Babbage's Analytical Engine, 1871.

Map of the route of the Atlantic telegraph cable, 1865.

Difference Engine No 1 assembled, 1853.

ATLAS circuit board, 1960s.

Demonstration model of Babbage's Difference Engine No 1, 19th century.

Babbage's Analytical Engine, 1834-1871.

Steve Heighway playing 'Pong', 26 September 1977.

Letter delivered by the first trans-Atlantic flight, 1919.