This notebook was used by Absalom M. Kennedy in May and August 1917 for notes on experimental work for the U.S. Navy performed under the direction of Edison during World War I. The entries from May relate to the procurement of a boat at Cold Spring Harbor, Long Island, setting it up for experimental work at Sandy Hook, New Jersey, and performing receiver and transmitter experiments. The entries from August pertain to experiments on the submarine detector. Included are details of trips to Sag Harbor, Long Island, to listen to torpedoes being fired at Bliss Proving Ground and other locations. The Bliss entries bear brief notations by Edison. The notes indicate that Isidor (Jerry) Chesler, E. Rowland Dawson, John A. Hanley, and Sherwood T. (Sam) Moore also worked on these experiments. The front cover is labeled "Experiments. #4. From May 1 to 1917." The pages are unnumbered. Approximately 110 pages have been used. Courtesy of Thomas Edison National Historical Park.