There are no dated entries in this notebook with the exception of one entry for October 12, 1880. The entries are by Francis Upton and Francis Jehl and consist of rough notes and calculations relating to lamp tests from Lots I and 2. There is also a table of lamps in Lot 2. The label on the front cover is marked "Lot 2 of 100" and "Oct 1880 F R Upton." The book contains 284 numbered pages. Approximately half the pages have been used. Courtesy of Thomas Edison National Historical Park.