This folder contains correspondence and other documents relating primarily to market conditions, company finances, and operations and experimental activities at the Stewartsville works. Among the correspondents are Edison, Herman E. Kiefer, William H. Mason, and Harry F. Miller. One item in Edison's hand pertains to experimental work on the blower house and to tests with duck and twill. Other letters concern the separation of water from washed ore; kiln output volume; tests with blowers in the clinker grinding plant; and plant inspection routines. Also included are letters dealing with quarry samples, product quality, competitors, and trade associations. A few items relate to Edison's other business interests in crushing rolls and milling technology.

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