This notebook covers the period November 1880-January 1881. Most of the entries are by Francis Jehl. A few entries appear to be by Francis Upton. Included are notes and calculations relating to tests of A-lamps. There is also a note and drawing by Edison regarding a method for preventing the carrying of carbon by electricity. At the end of the book is a list of the number of sons and daughters of Edison and others. The label on the front cover is marked "Reg Lamp A" and "Francis Jehl." The label also indicates that this notebook is, in part, a continuation of Book No 138 at p 39." The book contains 284 numbered pages.
Blank pages: 22-29, 130-269, 272-277. Courtesy of Thomas Edison National Historical Park.