This letterbook covers the period March-May 1882. Many of the letters are by Edison. There is also correspondence by Samuel Insull and Richard N. Dyer. Most of Edison's correspondence is in the hand of Samuel Insull, acting as Edison's secretary. The correspondence relates primarily to electric lighting and to patents. The electric lighting material includes orders for steam engines and electrical distribution equipment for central stations in the United Kingdom and France. The patent-related material concerns electric light and magneto-telephone patent interferences in the United Kingdom, France, and Germany. There are also some letters pertaining to legislation in the United States to protect purchasers of patented articles. Among the recipients are Armington & Sims, Charles Batchelor, S. Bergmann & Co., George E. Gouraud, and Edward H. Johnson. The front cover is marked "1882." The spine is labeled "1882" and is stamped "Edison Letters New York No.4." The book contains 478 numbered pages and an index. Approximately 60 percent of the book has been selected. Courtesy of Thomas Edison National Historical Park.