This notebook covers the period December 1880-Nebruary 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."