This folder contains correspondence and other documents relating to electric lighting and power. Some of the items pertain to the technical and commercial development of Edison's alkaline storage battery, including its use in Edison's proposed "Country House Lighting System." Among the documents for 1912 are letters concerning the thirtieth anniversary of Edison's pioneering Pearl Street station, his opinion in regard to isolated plants, and his continuing involvement with the General Electric Co. A few items deal with the commercial and technical development of Mazda Tungsten Lamps in the United States and Germany, including their use in automobile lighting.

Approximately 30 percent of the documents have been selected. The following categories of documents have not been selected: unsolicited promotional material; routine correspondence requesting Edison's advice, assistance, or attention on technical and commercial matters. Also not selected is the twenty-ninth Annual Report of the Edison & Swan United Electric Light Co., Ltd.