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The four books in this series were all begun in 1871 and were initially intended to serve as a "record of ideas" about telegraph devices. They cover the periods July 1871-March 1872 and April 1874-September 1875. The early entries are by Edison; later entries are by Edison and Charles Batchelor. The notes and drawings deal with telegraphy, the electric pen, and the electromotograph. Courtesy of Thomas Edison National Historical Park.