This notebook covers the period February-May 1880. Most of the entries are by Albert B. Herrick. There are also a few entries by other laboratory assistants. The book contains a record of experimental lamps burning at Menlo Park. The label on the front cover is marked "Record of Experimental Lamps." The book contains 282 numbered pages.
Blank pages: 154-273, 276-277, 280-281. Courtesy of Thomas Edison National Historical Park.