This notebook contains dated entries from June 1888. All entries are by Edison. At the beginning of the book is a 49-page list of minerals wanted for a specimen cabinet. On the following pages are notes and drawings relating to phonograph experiments, resins for recording cylinders, batteries (including those for the phonograph), and ore milling. Some of the notes on the phonograph contain references to Edison's recent patent applications. At the end of the book are several pages of miscellaneous drawings. The pages are unnumbered. Approximately 90 pages have been used. Courtesy of Thomas Edison National Historical Park.