The Incandescent Light Bulb (1879): October 22-23, 2022

Edison Notebook Series — Menlo Park Notebooks: Notebook #52 N-79-07-31 (1879-1880)

“This notebook covers the period July 1879–January 1880. Most of the entries are by Charles Batchelor. There are also entries by Edison and A. Poinier. The name of James Seymour appears occasionally as a witness. The first part of the book contains notes and drawings of experiments on metal filaments. Many relate to insulating materials used for coating the filaments. The second part of the book contains notes and drawings relating to the important series of experiments conducted in October 1879, which led to the invention of the carbon filament lamp. There are also notes and drawings documenting the development of the carbon filament through the end of 1879.

“Blank pages: 54–55, 108–109. Missing page numbers: 217–218.

“Courtesy of Thomas Edison National Historical Park.”