This notebook covers the period November-December 1880. The entries are by Edison, Albert B. Herrick, Charles Batchelor, and Francis Upton. The drawings by Edison relate to lamp experiments designed to prevent the "carrying of carbon by electricity." These experiments led to the discovery of the "Edison effect." The notes and drawings by Herrick, which constitute most of the book, concern experiments to chemically treat carbons, to improve vacuums, and to devise a better method of clamping carbons to the lead wires. The notes and drawings by Batchelor deal with improved vacuum pumps. The calculations, notes, and drawings by Upton pertain to conductors and to experiments in electricity and magnetism. The book contains 282 numbered pages.
Blank pages: 84-91, 160-161, 164-265, 268-281.
Missing page numbers: 127-128. Courtesy of Thomas Edison National Historical Park.