This notebook contains dated entries from January 1895. All entries are by Edison. At the beginning of the book are notes and drawings regarding the phonograph, including notes and hypotheses relating to phonograph diaphragms and sound reproduction. There are also notes, drawings, and cost calculations pertaining to ore milling. The pages are unnumbered, and the book has been used in both directions. Several pages have been removed from the book. Approximately 130 pages have been used. Courtesy of Thomas Edison National Historical Park.