This undated notebook was probably used during 1910. All entries are by Edison. Most of the book contains notes, drawings, and calculations regarding storage battery experiments. Included are logs of cell endurance tests and what appear to be preliminary plans for the manufacturing process. There are also scattered phonograph drawings. The front cover is labeled "1st Few pages Important data Bismuth." The pages are unnumbered. Approximately 80 pages have been used.
Courtesy of Thomas Edison National Historical Park.