This letterbook covers the period June 1904-November 1916. Many of the early letters are by Walter S. Mallory, vice president of ESBCo. Many of the later letters are by Harry F. Miller, who served as secretary and then as treasurer of the company. Other correspondents include Edison and George A. Meister. Included is correspondence regarding the financial health and administration of the company and relations with its British sales agents. Also included are letters delaying the payment of accounts, announcing board meetings, and arranging for the purchase of insurance and supplies. In addition, there is a series of letters prepared by Miller on Edison's behalf to investor Arthur I. Clymer of Ohio. A tag tied into the binding is marked "Edison S. B. Co. Duplicate Letter Book June 1904 to Nov 1916." The book contains 992 numbered pages and an index; it has been used to page 682. Several letters have been pasted into the book.
The book is badly water damaged, and many letters are illegible in part or in whole. Every effort has been made to locate fully legible documents elsewhere in the ESBCo record group that duplicate the information in this letterbook. Less than 10 percent of the documents in the book have been selected. The index has also been selected to provide information that may otherwise be inaccessible.
Additional letterbooks containing items pertaining to the development of Edison's storage battery can be found in the National Phonograph Company Records and the Edison Ore Milling Syndicate Records (Company Records Series).