Before revision: redirect Bessemer process#"Basic" vs.acidic Bessemer process 300x300px|Thomas converter operational from 1954 to 1964, in Dortmund, GermanyThe Thomas-Gilchrist process or Thomas process is a historical process for refining pig iron, derived from the Bessemer converter.
After revision: 300x300px|Thomas converter operational from 1954 to 1964, in Dortmund, GermanyThe Thomas-Gilchrist process or Thomas process is a historical process for refining pig iron, derived from the Bessemer converter.