using high-sulphur content coke." Anthracite and charcoal iron, because they were purer and less brittle, were preferred by foundries. Much of this objection to coke pig iron was removed after 1865; by 1872 more than one- third of the pig iron manufactured in the United States was smelted in coke

, however, amount of bituminous coal consumed at Safe Harbor Rolling Mill in Convention of Iron Masters, op. cit., Appendix, Table 3. 12. The Columbia Spy, 2 February 1856; George H. Burgess and Miles C. Kennedy, Centennial History of The Pennsylvania Railroad Company: 1846-1946 (Philadelphia, PA.: The