This collection consists primarily of letters exchanged between Edison and Secretary of the Navy Josephus Daniels, along with related correspondence. Many of the typewritten letters are accompanied by drafts in Edison's hand. The documents in this folder are from May-August 1917. They pertain to the development of a periscope that could be put over the side of a warship to observe the periscopes of enemy submarines in silhouette. Notes and drawings by experimenter Benjamin Liebowitz are included with Edison's report.
This project is described on pp. 179-180 of Lloyd N. Scott's Naval Consulting Board of the United States. Courtesy of Charles Hummel.