This notebook covers the period December 1878-June 1879. Most of the entries are by Francis Upton. There are also entries by Edison and Charles Batchelor. All of the material relates to experiments on electric lighting. Included are numerous notes, drawings, and calculations about generators; calculations relating to electric power distribution systems; and notes by Upton on \"elements of uncertainty\"" in experiments and tests. The book contains 284 numbered pages.

Blank pages: 4-5, 48-81, 92-93, 186-187, 210-221, 242-245, 248-249."