The only dated entry in this notebook is from March 1902. All entries are by Edison. The book contains notes and drawings regarding several experiments that deal mainly with electricity and electromagnetic radiation. Among the entries are items pertaining to x-rays, etheric force and "xyz rays," thermocouples, and electromotograph apparatus. Also included are scattered phonograph drawings. On the last page is a list of mine properties in Canada. The book contains 61 numbered pages, some of which are blank, followed by approximately 20 unnumbered pages.