Excellent video of a steam hammer at work at Westinghouse in 1904. Rather large though. Amazing to watch all of the assistants running about. Sometimes it feels like that at my little forge..... http://memory.loc.gov/cgi-bin/query/D?papr:12:./temp/~ammem_FkzV: also, not blacksmithing related but really clever....... http://science.howstuffworks.com/hydropower-plant4.htm