This pocket notebook was used by Edison for notes on chemical and electric lighting experiments. The only dated entry, near the end of the book, is for April 13, 1888. Most of the chemical experiments relate to insulation or to phonograph cylinders. The pages are unnumbered. Approximately 40 pages have been used.
Note: The images in this pocket notebook are quite small. They can be enlarged to a more readable size by using the "image zoom" feature of the Firefox browser. Click here to download the Firefox "image zoom" add-on. Right-click on the image to enlarge. Courtesy of Thomas Edison National Historical Park.