This notebook covers the periods December 1903 and March-June 1905. All entries are by Edison. The book contains notes and drawings regarding x-ray, storage battery, and phonograph experiments. The entries from 1903 pertain to the same x-ray tests as those entered in N-03-12-12.1. Among the storage battery items are a memorandum concerning the formation of European companies, notes regarding the design of cell grids, and a one-page layout of a battery factory. The phonograph drawings include a 2-page entry entitled "phono suspension for automobile." The pages are unnumbered, and one page has been removed from the back of the book. Approximately 110 pages have been used.