This notebook covers the period February-April 1907. It was used by Edison, Olav Berg, and Ludwig F. Ott as a log to record the preparation of iron compounds, numbers 3427- 4507, for use in storage battery endurance tests. The front cover is labeled \"Iron 3427 to 4507 Muckers--.\"" The pages are unnumbered. Approximately 210 pages have been used.

Only the sections of the book with substantive Edison notes and marginalia have been selected.