Electromagnets by The Erasmic Co. Ltd., Warrington; England for original mass spectrograph by F.W. Aston. Electromagnets, for Aston's first mass spectrograph, c. 1919. 1919
Brass box spanner, with a rectangular piece of brass and two glass plate components, from Prof. F.W. Aston's original Aston Mass-Spectrograph, by Francis William Aston, Cambridge, England, 1918-1925 Brass box spanner 1918-1925