This notebook covers the period June 1874-February 1878. All of the entries are by Charles Batchelor. The notes and drawings relate to telegraphy, the telephone, the electric pen, the electromotograph, the typewriter, and various mechanical devices. Some of the entries pertain to Edison's inventions, but many also concern Batchelor's own ideas. Pages 29-41 and 43-44 contain impressions of plates, which may have been intended to accompany an 1874 manuscript by Edison and Batchelor on telegraphy. This material can also be found in Notebooks, Cat. 297 and Cat. 298 (Thomas A. Edison Papers, Part I (1850-1878)), and it has not been selected here. The book contains 74 numbered pages and an index. Pages 1-40 were numbered by Batchelor. The remaining pages were numbered by an archivist.

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Courtesy of Thomas Edison National Historical Park.