This notebook was used during April 1908. All entries are by Edison. The book contains a log of storage battery cell tests. Some of the entries indicate the involvement of Walter E. Holland, George H. Hooper, Jr., and Charles Dally. Inserted into the book are 2 pages of cell test notes by Holland. The pages are unnumbered. Approximately 100 pages have been used.
Courtesy of Thomas Edison National Historical Park.