This pocket notebook dates from September 1882. All of the entries are by Edison. Included are drawings of cut-offs and electrical governors for the steam engines at the Pearl Street central station; drawings of armature windings and connections; and notes about lamps, including filament and vacuum experiments. There are also miscellaneous notes by Edison to himself relating to the electric light; miscellaneous calculations; and a note to Miller F. Moore about an isolated plant at Jas. Aikman and Co. The pages are unnumbered. Approximately 50 pages have been used. Several pages have been torn out of the book. Courtesy of Thomas Edison National Historical Park.