This notebook contains dated entries from 1888 and 1889. All entries are by Edison. At the beginning of the book is a 20-page list of items wanted for the laboratory. The following pages contain undated drawings relating primarily to phonographs and dynamos. Also included are a page labeled "Caveat Dec 7 ," pertaining to an unidentified technology; a partial floor plan, possibly for the phonograph works; some notes on chemical experiments; and notes and drawings for a municipal lighting system, labeled "Caveat May 23 89." Near the end of the book is a memo regarding the acquisition of some catalogs. The pages are unnumbered, and at least one page has been removed from the back of the book. Approximately 160 pages have been used. Courtesy of Thomas Edison National Historical Park.