Hydrostatic balance by Jesse Ramsden, London, 1785-1789 (scales (weighing devices); analytical balances; equal-arm balances)
Black and white photographic print and display label, showing individual ions in the track of a fast beta-ray (black-and-white print - photograph; label)
Photographic print and display label, showing a nitrogen nucleus projected by a neutron (black-and-white print - photograph; label)
Black and white photographic print, showing secondary electrons produced in air by gamma-rays (black-and-white print - photograph; label)
Black and white photographic print, showing the tracks of beta-rays from radium (black-and-white print - photograph; label)