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The collection includes two of his diaries (1854 and 1875), letters of condolence on his death and many of his personal letters. Some of the letters pertain to his work in the explosives industry while many are correspondence between him and his social and professional contemporaries: Sir William Armstrong, Sir James Dewar, The Duke of Devonshire, Michael Faraday, Thomas Graham, Carl Haag, A W von Hofmann, William Odling and William Rockerfeller as well as the private secretaries acting on behalf of Queen Victoria and the Prince of Wales (latterly King George V).