TCI, as the company came to be known, had been founded in 1852 as the Sewanee Mining Company. In 1907 they became U.S. Steel's primary southern subsidiary. The company's operations in the Birmingham area and elsewhere in the state made it one of Alabama's largest employers for decades.
Below the photos is a selection of pages from a book the company published in 1900. Included are a description of the Ensley Furnace Division and the book's title page and first page of the table of contents. The photo of the blowing engines at the furnaces is also from the book.
Source: Detroit Publishing Company via the U.S. Library of Congress Digital Collections [both photos]