This notebook was used by William Deans, William A. Hayes, and Sherwood T. (Sam) Moore during March-April 1918 for experimental work done at sea on submarine detection. Included are notes on experiments with sound detection and recording. Several entries contain notations regarding Edison's comments, suggestions, and instructions. There are also some rough drawings by Edison. The book contains 27 numbered pages, some of which are blank. Courtesy of Thomas Edison National Historical Park.