This notebook covers the period November 1878-July 1879. Most of the entries are by Edison, Charles Batchelor, and Francis Upton. There are also entries by George E. Carman and George Jackson. The names of Martin Force and John Ott appear occasionally as witnesses. Almost all of the material relates to experiments on electric lighting. Included are notes and drawings of lamps; notes on materials for filaments; drawings of devices for producing and testing filaments; notes, drawings, and calculations about generators; notes by Edison on gas use in San Francisco; and drawings of arc lamps. There are also notes on batteries made and tested, notes on carbon button tests, and notes and drawings of telephones. The book contains 274 numbered pages.
Blank pages: 240-241, 258-261, 270-273.
Missing page numbers: 264-265, 268-269. Courtesy of Thomas Edison National Historical Park.