This notebook covers the period July-August 1880. It was used by Edison to record notes and drawings relating to lamps, dynamos, meters, voltage regulators, and the electric railroad. There are also notes on electric railroad patents issued to other inventors. The label on the front cover is marked "Private Patent Book" and "T A Edison." The book contains 276 numbered pages.
Blank pages: 20-51, 78-276.
Missing page numbers: 75-76. Courtesy of Thomas Edison National Historical Park.