These letters, which cover the years 1881-1926, concern the relationship between Edison and Samuel Insull, a public utility magnate who once served as Edison's private secretary and as vice president of the Edison General Electric Co. The correspondence pertains to a variety of subjects, including incandescent lighting, storage batteries, and electric vehicles.

Among the unselected items is an extract from Insull's memoirs regarding his association with Edison. A variant version of these reminiscences appears in The Memoirs of Samuel Insull: An Autobiography (Polo, Illinois, 1992). Also not selected is a retained copy of a letter from Insull to Thomas Commerford Martin, February 10, 1909, together with a 36-page response to a series of questions about Insull's relationship with Edison. The letter and another version of the response can be found in Thomas A. Edison Papers: A Selective Microfilm Edition, Part IV (1899-1910).

An online finding aid to the archival collection is available.

Courtesy of the Loyola University Chicago Archives.