This folder contains correspondence and other documents relating to the business of the Edison Electric Light Co. of Philadelphia. Most of the correspondence is by William D. Marks, general manager of the company. There are also several reports by Marks to the company's board of directors concerning the construction and operation of central stations.

Approximately 90 percent of the documents have been selected. The following categories of documents have not been selected: letters of transmittal and acknowledgement; meeting announcements; other routine business correspondence; order forms for supplies.