This notebook was probably used on September 23 and September 24, 1880 to record tests made by Edison, Francis Upton, Francis Jehl, and Sigmund Bergmann of gas jets at Bergmann's factory. (See Charles P. Mott's entries of those dates in Menlo Park Notebook #117.) Included also are references to books on gas lighting and a clipping relating to gas light tests made by the New York Department of Public Works. The label on the front cover is marked "Gas." The book contains 282 numbered pages. The last page has been torn out of the book.
Blank pages: 24-195, 198-235, 238-239, 242-253, 260-273. Courtesy of Thomas Edison National Historical Park.