This notebook was used by Edison during October 1901. It contains a list of twenty- eight items noting possible causes of variations in the output of the storage battery. Inserted into the book is a note from February 1902 by an unidentified experimenter regarding the assay of an ore sample from Grant's Pass, Oregon [not selected]. The front cover is marked "Oct 01." The pages are unnumbered. Only 7 pages have been used.