Alpha-ray tracks, early 20th century.

Straggling of alpha rays from polonium, c 1937.

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

Beryllium bombarded by alpha rays from polonium, c 1937.

'Windsor Horse Show'

Cavendish Laboratory Researchers, 1928.

Diagram of a Maglev test centre's guideway and control equipment.

Berkhamsted, BR print, c 1950s. British Rai

Ray diagrams, 1704.

X-ray of a human hand, 1895-1915.

Chelsea Flower Show,1968

X-rays from Sirius B, 6 October 2000.