This notebook covers the period February-June 1905. Most of the book contains notes, primarily by Edison, regarding storage batteries. Among the entries are items pertaining to the preparation of nickel flake and to the loading of the flake in the tubes within each cell. These entries were witnessed by Frank L. Dyer. In the middle of the book are abstracts relative to the nickel preparation, which an unidentified experimenter copied from scientific journals. Near the end of the book are lists of cells to be used in endurance tests. The front cover is labeled "Tubes Record." The pages are unnumbered. Approximately 140 pages have been used.