The one dated entry in this notebook is from February 1899. All entries are by Edison. At the beginning of the book are notes and drawings relating to electric meters. Most of the book contains notes and drawings pertaining to cement rock and the production of cement, including cost estimates for cement manufacture. There are also notes regarding the production of phosphoric anhydride and phosphoric acid, possibly as a by-product of Edison's ore milling and cement technologies. The pages are unnumbered, and several pages have been removed from the book. Approximately 120 pages have been used.