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-April 1917. They pertain to Edison's plans to develop a searchlight for use by submarines under water. Related material can be found in Report 11.

This project is described on p. 177 of Lloyd N. Scott's Naval Consulting Board of the United States.