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Workers at Nobel Explosives Company Limited, Ardeer, Ayrshire, 1884. 2: gate to Danger Department, with searcher on duty. 3: laboratory. 4: stores. 5: preparation of Kieselguhr which was mixed with nitroglycerine to form dynamite. 6: producing nitric acid. From The Illustrated London News, 16 April 1884. (KEYSTONE/HERITAGE IMAGES/Oxford Science Archive)