This notebook covers the period June-November 1879. Most of the entries are by Francis Upton. Included are notes and calculations relating to tests of the Edison dynamo. There are also a few drawings. Some of the entries are cross referenced to "Book 8." Toward the end of the book are notes and calculations about tests of sewing machine motors. On pages 234-235 are drawings by Edison of the telephone. The label on the front cover is marked "Faradic Machines 2 Tests." The book contains 284 numbered pages.

Missing page numbers: 175-176.