This undated pocket notebook was used by Edison, probably during 1906. It may have been used at his winter home in Fort Myers, Florida. Included are descriptions and lists of experiments to perform, including work on phonographs, storage battery components, electrical rectifiers, telephones, thermocouples, and "wireless." The entries contain Edison's speculations regarding magnetism, the chemical properties of various metals, and the nature of electricity. There are also notes on the "Edison effect" and on work by Michael I. Pupin and other scientists. Among the employees mentioned in relation to individual experiments are Charles Dally, Otto Groethe, Walter E. Holland, and Frederick P. Ott. The front cover is stamped "Ledger." The pages are unnumbered. Approximately 120 pages have been used.
Courtesy of Thomas Edison National Historical Park.