This notebook was used by Edison for notes and calculations relating to operations at the Stewartsville works during the period July 1905-February 1906. The calculations detail plant capacity and losses in time at different stages of production. Included is information regarding the crusher and packing plants, the kilns, and the quarry. Other entries pertain to supplies, repairs, and the consumption of coal and oil. The front cover is marked "Cement." The pages are unnumbered. Approximately 60 pages have been used.