This undated notebook was used by Charles T. Dally, probably in July 1917, for notes on experimental work done for the U.S. Navy. Most of the entries pertain to smoke generation to conceal ships. A two-page note from Edison to Dally on preparing the "smoke producing stuff" has been inserted into the beginning of the book. The initial entries by Dally on rosin experiments are related to work in Notebooks by Other Experimenters -- Phonograph Record Experiments -- C. T. Dally Disc Blanks Composition Books . The front cover is labeled "1445." The pages are unnumbered. Approximately 25 pages have been used. Courtesy of Thomas Edison National Historical Park.