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These standard-size (6" x 9") notebooks cover the period 1887-1898. There are also scattered entries from the early 1900s. Most of the books were used at the West Orange laboratory. Almost all entries are by Edison, although there a few by associates such as Arthur E. Kennelly and William K. L. Dickson. The books contain notes, drawings, and calculations regarding a variety of subjects, including phonographs, lamp filaments, electric power, the kinetoscope, batteries, ore milling, and the electric railway. There are also drafts of patent caveats, items relating to Edison's plans for the laboratory, and theoretical notes primarily concerning physics and electricity. Courtesy of Thomas Edison National Historical Park.