This undated non-standard-size notebook was used by Edison, possibly in 1902 or 1903. It contains notes and drawings regarding electrical theory and the reaction of metals in electrical fields. The entries may relate to Edison's experiments with x-rays, etheric force, and "xyz rays." The pages are unnumbered, and several pages have been removed from the book. Approximately 90 pages have been used.
Courtesy of Thomas Edison National Historical Park.