First picture of a positron track, taken by Carl Anderson, 1932.

Chelsea Flower Show,1968

Photographs of tracks made by ionised particles in a cloud chamber, c 1920s.

'Columbus Day Parade, New Haven', 1964

Gamma rays from thorium C11, c 1937.

Straggling of alpha rays from polonium, c 1937.

The track of a fast beta-ray, early 20th century.

Brick Lane Market,1966

Butlins, Clacton,1967

Knights of the Green, Southampton,1969

May Day Celebrations,c. 1967

Piccadilly Circus, London,c. 1967