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 March 1917. They pertain to Edison's efforts to develop a method of getting more power out of a torpedo so as to permit the use of a larger explosive charge with the same range and possibly greater speed. The experiments were conducted by Karl T. Compton, a volunteer from Princeton University who would later become a renowned physicist and president of MIT. Courtesy of Charles Hummel.