This notebook covers the period October-December 1885. Most of the entries are by Edison. The name of John F. Ott appears frequently as a witness. Included also are a few entries by H. DeCoursey Hamilton, which were witnessed by Martin Force. All of the notes and drawings relate to phonoplex and sextuplex experiments. The spine is labeled \"25.\"" The book contains 288 numbered pages.
Blank pages: 76-287."