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These notebooks cover the period June-December 1886 and contain notes, drawings, and calculations relating to experiments performed at Edison's lamp factory in Harrison, New Jersey. Most of the entries are by Edison and John F. Ott. One book contains entries by Mina Edison. Another book was used primarily by Ezra T. Gilliland and consists of notes and drawings pertaining to telephones, phonographs, and a railway telegraph and telephone, along with drawings by Ott for a village system generator. All of the other books relate to lamp experiments, but one of the books also includes drawings of Edison's phonoplex. Courtesy of Thomas Edison National Historical Park.