This folder contains correspondence and other documents relating primarily to activities at the Stewartsville works. Most of the letters are to or from Edison, Walter S. Mallory, Theron I. Crane, Edward A. Darling, and Francis R. Upton. There is also correspondence by attorney Alexander Elliott, Jr.; T. Commerford Martin of the Electrical World and Engineer; and investor and director Robert H. Thompson. The documents deal mainly with costs, equipment, and supplies. Some items pertain to meetings of the board of directors; others concern the uses of cement. Included are cost calculations for producing cement at capacities of 5,000 and 10,000 barrels per day.

Less than 5 percent of the documents have been selected. The unselected material includes letters relating to patent fees and competitive bids on forgings.