This notebook covers the period June-August 1882. Most of the entries are by Edison. There are also a few entries by Charles Batchelor At the beginning of the book are notes by Batchelor on a record-keeping system for electric light companies. The remainder of the book contains notes and drawings by Edison, many of them for a draft caveat concerning lamps, generators, arc lights, and methods for regulating the electromotive force of the current. The label on the front cover is marked "Book Keeping for Electric Light." The book contains 280 numbered pages.

Blank pages: 122-151, 40-145, 156-197, 216-265, 272-273, 276- 279.