The surviving remains of the "New Furnace" contain several very rare items, including the stack, a Nielsen-type hot blast stove, and the blowing engine, built by the Hudson River Iron and Machine Company of Ft. Edward, New York. During the 1850s the American iron industry witnessed the change from a charcoal-burning to a coal-burning smelting process. The site clearly portrays this historical transition in technology.
Source: HAER