This notebook covers the period June-July 1898. It was used by Ernest D. Kellogg as a logbook for meter tests. At the end of the book are several pages of undated notes by an unidentified experimenter relating to experiments on the heating of brass tubing. The front cover is labeled "Experimental Integrating Meter Reversing Electrolytic Mr. Kellogg(?) June 30-July 28, 1898." The pages are unnumbered, and the book has been used in both directions. Several pages have been removed from the book. Approximately 40 pages have been used. Courtesy of Thomas Edison National Historical Park.