This folder contains correspondence and other documents relating to the technical and commercial development of the telegraph. Among the items for 1911 is a letter from inventor and engineer William E. Athearn requesting a viewing of Edison's new circuit for quadruplex telegraphy, along with a demonstration of the latest business phonograph. The two other items are unanswered letters by W. S. Meriwether of the New York World concerning the demonstration of a telegraphic device invented by longtime Edison associate Patrick B. Delany.

All of the documents have been selected.

Courtesy of Thomas Edison National Historical Park.