Use of Anthracite Coal
By the 1850s, improvements in coal technology had produced anthracite coal, which burned hotter than bituminous coal. New furnaces burned hotter and were much more efficient, and the industry was moving west to places like Pittsburgh. As a result, many of the furnaces and forges closed. Speedwell closed in 1854; Cornwall held out until 1883. Some of the furnaces (including Cornwall and Hopewell) survived, simply because the furnaces were too massive to do anything with. Forges, on the other hand, could be completely dismantled and abandoned. As a result, there are no extant forges remaining in America.
Read more about this topic: Speedwell Forge
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—Ralph Waldo Emerson (1803–1882)