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Aston's first mass spectrograph, c. 1919.

Aston's first mass spectrograph, c. 1919.

1918-1925
Glass discharge tube, for Aston's original mass spectrograph

Glass discharge tube, for Aston's original mass spectrograph

1919
Aston's quartz microbalance, c. 1919

Aston's quartz microbalance, c. 1919

1914-1924
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