De Dondi's 'Astrarium', the world's first astronomical clock, 1364.

Horseshoe magnet, 2000.

Fleming's penicillin mould, 1935.

Standard Kilogramme, c 1930s.

Five original experimental coils used by Faraday, 1831.

Dr Oswald John Silberrad in his library, Loughton, Essex, 1947.

Aston's first mas spectrograph, 1919.

Leyden jar, 1746.

"Single sand glass in four pillared wooden mount, 18th century."

Ullage slide rule, 1759-1776.

Sikes hydrometer, 1870-1930.

Two slide rules, 1663 and 1881.