This notebook covers the period July-October 1880. The entries are by Charles L. Clarke. The book contains calculations, notes, and drawings relating to the electric railroad, especially the design of the locomotive. There are also four pages of notes and calculations about copper conductors and two scaled template patterns for dynamos. The label on the front cover is marked "C. L. Clarke." The book contains 284 numbered pages.
Blank pages: 142-279, 284. Courtesy of Thomas Edison National Historical Park.