This notebook is undated but was probably used in 1880. The entries are by Francis Upton and William J. Hammer. Included are notes, calculations, and tables relating to conductors needed for the Pearl Street central station. There are also a few drawings of electric power distribution systems. The label on the front cover is marked "Hammer," "Upton," and "Line Figureing for Station." The book contains 284 numbered pages.
Blank pages: 234-283. Courtesy of Thomas Edison National Historical Park.