This notebook covers the period November 1873 - July 1874. The laboratory notes and drawings are by Edison and Charles Batchelor. They deal primarily with automatic, printing, and chemical telegraphy; batteries; and general electrical experiments. There are also notes on the electromotograph. At the beginning of the book is a list of hours worked by the employees of the firm of Edison & Unger, probably for 1871. The front cover is labeled "Volume 7." On many of the pages there are faint page/volume numbers similar to those used in Unbound Notebooks, volumes 8-1 8. The book contains 219 numbered pages.

Missing pages: 1-80.

Courtesy of Thomas Edison National Historical Park.