This notebook contains dated entries from February 1908 and April-June 1919. There is also one note dated August 1922. All entries are by Edison. The book contains notes and drawings regarding various uses for electromotograph technology, including sound apparatus for motion pictures and sound amplification for phonographs and telephones. There are also entries relating to experiments with various electrical phenomena, including x-rays and "xyz rays." It is possible that the 1908 entries were transcribed by Edison in 1919 from another book. However, the book bears a physical resemblance to other books from 1907-1908, many of which were used by Edison in Fort Myers, Florida. Most likely, Edison stored this book at the Florida laboratory and began making new entries into it after he returned to experiments on the electromotograph and the chalk telephone in 1919 (see N-19-04-20.2 and N-19-04-23.2). The pages are unnumbered. Approximately 140 pages have been used.