This notebook covers the period April-May 1907. All entries are by Edison. The book contains logs of storage battery cell tests and notes regarding the preparation and loading of nickel flake in the cell grids. It appears to have been used primarily at Fort Myers, Florida. At the beginning of the book, Edison\'s youngest son, Theodore, signed his name in November 1906. The pages are unnumbered. Approximately 80 pages have been used.