This folder consists of letters from Robert H. Thompson to Walter S. Mallory. They relate primarily to company finances, the board of directors, visitors to Stewartsville, and meetings with Edison. Some letters deal with test runs at the Stewartsville plant and the development of Edison's storage battery, as well as the uses of cement and prospects for the cement industry. One letter concerns a South African inquiry about crushing machinery; another mentions a wager between Edison and Thompson involving cigars. There is also material pertaining to the personal affairs of Mallory and Thompson.

Approximately 40 percent of the documents have been selected.