This folder contains correspondence, agreements, and other documents relating to the business of the Edison Electric Light Co. Much of the correspondence is by Frank S. Hastings, secretary and treasurer of the company, and by Jonathan H. Vail, general superintendent. Included also is a 46-page report by Siemens & Halske "About the Use of Transformers in Electric Light Plants." Related material can be found in the Primary Printed Series.

All of the documents have been selected except for routine notices for meetings of the board of directors and for stockholders' meetings.