Diagram of a steam hammer patented by scottish engineer james nasmyth (1808-1890). "nasmyth's patent steam hammer, copied by permission of the inventor from the machine in the great exhibition". Illustration in: "cyclopædia of useful arts, mechanical and chemical, manufactures, mining, and engineering", ed. By charles tomlinson, london: new york, g. Virtue & co. , 1854. Date: 1854.
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