This notebook covers the period March-June 1881. The entries are by Francis Jehl and consist of notes, calculations, and a few drawings relating to meter experiments. The label on the front cover is marked "Experimental Lamps" and "Francis Jehl." The book contains 276 numbered pages.

Blank pages: 118-275.

Missing page numbers: 1-2, 39-40.

Courtesy of Thomas Edison National Historical Park.