This folder contains correspondence and other documents relating to the technical and commercial development of the phonograph. Included are two items from May regarding a possible visit to the West Orange laboratory by Samuel L. Clemens (Mark Twain). Also included are two versions of a typed phonogram message entitled "Mr. Edison's trip around the World." Some of the letters relate to the donation of a phonograph to the Hemenway Southwest Archeological Expedition. There is also correspondence regarding Edison's competitors, Charles S. Tainter and the American Graphophone Co. Among the correspondents are Gaston & Marsh, Edison's phonograph agents in Detroit; Franck Z. Maguire, Edison's agent in Philadelphia; and P. Everitt, a New York engineer who was involved in a phonograph experiment.

All of the documents have been selected except for duplicate copies of selected documents.

Related material can be found in D-88-01 (Battery).

Courtesy of Thomas Edison National Historical Park.