Five veterinary fleams.

Chinese abacus or Suan Pan, 19th century.

Chinese Abacus.

Chinese abacus.

Suan Pan, Chinese Abacus.

Japanese abacus from the Japanese Chamber of Commerce and Industry, 1996.

Japanese abacus, c 1900.

Chinese abacus, early to mid 19th century.

Early cyclotron designed by Lawrence and Livingston, 1932.

Early cyclotron designed by Lawrence and Livingston, 1932.

Lift-off of Space Shuttle Endeavour, 12th September 1992.

Sinclair digital 'Black Watch' kit, 1975.