This notebook covers the periods January and August 1900. At the beginning of the book are notes from January 1900 by an unidentified experimenter regarding magnetic iron ore separation and cement experiments [not selected]. The remainder of the book contains notes and cost calculations from August 1900, primarily by Edison, in regard to storage batteries. Included are entries recording Edison's early tests with copper and zinc electrodes. There is also one entry on copper ore separation. The front cover is labeled "Started Aug 6th 1900 (1)." The pages are unnumbered, and at least one page has been removed from the book. Approximately 120 pages have been used.