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 February and July 1917. They pertain to Edison's work on a method to preserve submarine guns from rust. Included is a photograph that probably relates to these experiments.
This project is described on p. 192 of Lloyd N. Scott's Naval Consulting Board of the United States. Courtesy of Charles Hummel.