'Atom Tracks' catalogue 1937.
© Science Museum / Science & Society Picture Library
Front cover of a catalogue produced by the Science Museum, London, for an exhibition celebrating 25 years of research on the behaviour of individual atoms and electrons by the expansion chamber method of CTR Wilson. The exhibition displayed cloud chamber photographs taken by physicists in Germany, France, Britain, the United States and the Soviet Union. At the time, nuclear physics had no practical applications, but within a decade this had changed dramatically.