Close-up of Doron Swade, senior curator of computing and information technology at the Science Museum, London, with the Phillip's Economic Computer, built in 1949. The machine was conceived by Bill Phillips (1914-1975), a New Zealand-born engineer turned economist. Phillips designed the machine to demonstrate in a visual way the circular flow of money within the economy. Approximately fourteen machines were built, and this particular machine was used as a teaching aid at the London School of Economics. It ran until May 1992.
© Science Museum / Science & Society Picture Library