This notebook covers the period March-October 1881. All of the entries are by Charles L. Clarke. The book contains notes and drawings of the armature for the dynamo at 65 5th Avenue, New York City and notes and calculations relating to experiments on underground conductors for the Pearl Street station. The label on the front cover is marked "Armature Wires" and is stamped "Charles L. Clarke." The book contains 278 numbered pages.
Blank pages: 16-278. Courtesy of Thomas Edison National Historical Park.