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 two letters in this folder are from June 1917. They pertain to a device to permit high-speed signaling with searchlights, which Edison invented at the behest of Lt. Miles A. Libbey of the Brooklyn Navy Yard. A photograph of the invention is included with Edison's letter.