This notebook covers the period November 1878-January 1880. It contains tests for non-radiating substances conducted by John K. Knight during November and December 1878 and results of Knight's research to find a chemical to extend the red spectrum. There are also entries by Edison, Charles Batchelor, Francis Upton, and John Kruesi. These include notes, drawings, and calculations about generators; drawings of lamp sockets; miscellaneous drawings, calculations, and experiments relating to electric lighting; notes by Edison on thermopiles; and notes by Batchelor on Edison's telephone. The book contains 282 numbered pages.
Blank pages: 24-25, 82-83, 116-117, 158-161, 194-199, 202-237, 242-249, 252-281. Courtesy of Thomas Edison National Historical Park.