This notebook covers the period November-December 1880. Most of the entries are by Francis Jehl. A few entries appear to be by Francis Upton. The book contains notes and calculations relating to tests of experimental lamps. Included are tests of bamboo, bast, paper, and gasoline-treated carbons. The label on the front cover is marked "Lamps Lot D" and "Francis Jehl." There is an index on the inside front cover. The book contains 284 numbered pages. Courtesy of Thomas Edison National Historical Park.