This notebook is a continuation of N-10-04-10. It was used during September 1910. All entries are by Edison. It is the third of three books that contain notes and drawings regarding phonograph recording apparatus. Several entries detail the use of motograph and telephone technology as means of improving recording fidelity. At the end of the book are drawings of phonograph cabinet designs. The front cover is marked "Phonograph Sept. 1910." The pages are unnumbered. Approximately 50 pages have been used.