This notebook covers the period December 1880-February 1881. Most of the entries are by Francis Jehl. The notes, calculations, and drawings relate to special filament arrangements and to chemically treated and platinized carbons. There are also a few cross references by John Lawson to his experiments in Menlo Park Notebook #168. The label on the front cover is marked "Experimental Lamps (Special)," "1880," and "Francis Jehl." The book contains 284 numbered pages.
Blank pages: 274-277. Courtesy of Thomas Edison National Historical Park.