This folder contains correspondence about Edison's past work in the electrical industry, as well as inquiries and suggestions about electric lighting. Among the items for 1917 is an inquiry about the early three-wire central station at Sunbury, Pennsylvania. Also included is correspondence with consulting engineer Elmer H. Schwarz, an associate of former Edison employee Edwin J. Hammer, about the switches used on the SS Columbia, an early isolated plant installation.
Approximately 10 percent of the documents have been selected. The unselected items include general historical inquiries answered by Edison's personal assistant, William H. Meadowcroft, and other unsolicited letters that received a form-letter response stating that Edison was too busy to consider them or that he was no longer involved in the electric light and power industry. Courtesy of Thomas Edison National Historical Park.