This undated notebook was possibly used during July 1917. All of the entries are by Edison. Some pertain to his work for the U.S. Navy during World War I, while others relate to ongoing efforts to improve the surface quality of Edison disc records. Included are lists of possible smoke and fog generating methods for use by merchant ships at sea, along with drawings of possible submarine or torpedo detection devices. Additional entries directed to William Walter Dinwiddie propose experiments on the construction of powder blanks for disc records. Inserted into the book are three loose reports by J. Miller, giving the results of tests with experimental disc records. The reports probably relate to experiments described in N-17-07-15 and other Disc Record Books (Notebooks by Edison and Other Experimenters). The pages are unnumbered. Only 15 pages have been used. Courtesy of Thomas Edison National Historical Park.