This notebook covers the periods December 1896-March 1897 and November 1897-January 1898. It is the fourth of four books used by an unidentified experimenter to record lamp tests, nos. 1-302. This book contains a log providing additional information on tests, nos. 38, 107, 118, and 124-302. The log lists running totals for the life of each lamp. The front cover is marked "Records from Dec 8 `96." The book contains 200 numbered pages.

Blank pages: 1, 48-200.

Courtesy of Thomas Edison National Historical Park.