This undated notebook was probably used sometime during the period 1909-1910. It contains a log by Edison of storage battery cell tests. The book appears to be part of a test series, but the other books have not been identified. One of the entries indicates the involvement of Ignacy Goldstein. The front cover is marked "Regulars" and is labeled "1201 Reg 1334 Reg." The pages are unnumbered. Approximately 40 pages have been used.