This notebook covers the period October 1888-January 1889. It was used by Edison for drawings relating to dynamos, electric power distribution, and lamp vacuum experiments. Also included are notes and drawings pertaining to phonograph, typewriter, and ore milling caveats. At the end of the book is a table of chemicals and suppliers and a series of calculations. Inserted into the book is a 2-page note from Edison to experimenter James W. Gladstone regarding phonograph cylinders. The pages are unnumbered. Approximately 70 pages have been used. Courtesy of Thomas Edison National Historical Park.