This pocket notebook is from box 15 in Series 1 of the William J. Hammer Collection. The entries are all from January 1893. The first page contains the inscription "Memoranda of Inventions of Thos. A. Edison." However, only a few inventions are discussed the electrographic vote recorder of 1869 and the zirconia lamp of 1879. The remainder of the book contains notes regarding tests of commercial Westinghouse lamps. The pages are unnumbered; only 12 pages have been used. Courtesy of the NMAH Archives Center.