These documents, which cover the years 1915-1919, relate to Edison's research on war-related projects. A letter from Secretary of Commerce William C. Redfield to Secretary of the Navy Josephus Daniels concerns the potential use of the Bureau's laboratories for the Naval Consulting Board's scientific research. Two other letters, exchanged between Edison and Director Samuel W. Stratton, pertain to technical issues in radio communication.

Courtesy of the National Archives.