This notebook covers the period September-October 1906. Most entries are by Edison, although there are a few scattered notations by an unidentified experimenter. The book contains notes by Edison regarding the preparation of iron compounds for storage battery experiments. Some of the entries also indicate preliminary test results from cells using the iron compounds. In several entries, Edison notes the involvement of Otto Groethe. The front cover is labeled "Got all Runs Iron 2500 to 2850." The pages are unnumbered. Approximately 260 pages have been used.