This notebook was used during February 1902. All entries are by Edison. The book contains notes and drawings regarding several experiments that deal mainly with electricity, matter and energy, and physical theory. There are entries pertaining to x-rays, motographs, telephones, phonographs, and electric furnaces, together with notes on "instruments to detect different waves in the 'ether.'" Many entries contain the notation, "gave to John Ott." Inserted into the book are several pages of notes by Edison, including a 3-page note listing various theories of the ether. The pages are unnumbered. Approximately 120 pages have been used.
Courtesy of Thomas Edison National Historical Park.