This undated notebook was probably used in late 1914 or in early 1915. All of the entries are by Edison and pertain to the absorption of benzol gas. Included are experiments with various absorbing towers, different arrangements for passing water through the apparatus, varying amounts of gravel in the towers, and different amounts of pressure on the gas entering the towers. The front cover is labeled "Benzol Absorbing Expmts." The pages are unnumbered. Approximately 20 pages have been used. Courtesy of Thomas Edison National Historical Park.