This notebook covers the period October 1880-February 1881. Most of the entries are by Francis Jehl. There are also a few entries by Francis Upton. All the entries relate to tests of lamps sent from the lamp factory to the laboratory. There is also a copy of a memorandum by Charles Batchelor regarding these lamps. The label on the front cover is marked "Lamps Lot I," "16 C," and "Francis Jehl." The book contains 284 numbered pages.
Blank pages: 44-45, 112-115, 126-143, 168-279. Courtesy of Thomas Edison National Historical Park.