Menlo Park, New Jersey, 1878. Seven mounted albumen prints on card. Each photograph depicting different sound equipment such as the phonograph, megaphone, and chemophone. Five photographs with Thomas Edison's Menlo Park Laboratory copyright stamp on verso, as well as Charles P. Edison's signature, date, and insciption identifying each object; two photographs with no stamp or inscription; and one photograph with an additional gift inscription from lab assistant Herbert S. Read to Flora M. O'Brien, dated June 29, 1888. Included are nine paper copy photo reproductions and one envelope.