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The six books in this series cover the period October 1875 - March 1879 and consist primarily of laboratory notes by Edison and Charles Batchelor. They also contain laboratory notes, caveats, and patent specifications, which were copied into these volumes by Edison's bookkeeper, William Carman. The notes and drawings deal with electric lighting, telegraphy, etheric force, the telephone, the electric pen, the electromotograph, electric motors, batteries, ore mining, and miscellaneous chemical and electrical experiments. One volume, in Batchelor's hand, contains eight "axioms." Courtesy of Thomas Edison National Historical Park.