This undated notebook, which was probably used during October 1906, is a continuation of N-06-09-01.2. It was used by Edison and an unidentified experimenter to record notes regarding the preparation of iron compounds for storage battery experiments. Most of the entries also indicate preliminary test results from cells using the iron compounds. Several of the entries note the involvement of Otto Groethe. The front cover is labeled "Entered Iron 2851 to 4193." The pages are unnumbered. Approximately 290 pages have been used.