This pocket notebook was used by Edison in the late 1880s or early 1890s for notes regarding experiments on batteries, a sound bridge, chemicals, lamp filaments, and ores. There are also entries relating to the development of a theory of the sense of smell. The front cover is stamped "A Pad for a Penny." 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.