This scrapbook covers the period May-November 1887. The entries are by Edison. Included are notes and drawings relating to phonographs, ore separators, lamps, electric power distribution and regulation, and the production of wrought iron. Many of the entries contain notes by Edison to Richard N. Dyer, his patent attorney. The name of Mina Edison appears as a witness on some of the documents. The case number of Edison's patent application has been written on some of the items. Courtesy of Thomas Edison National Historical Park.