This letterbook covers the period May 1883-January 1884. Most of the correspondence is by Edison. There is also correspondence by Samuel Insull. Most of Edison's letters are in the hand of Insull, acting as Edison's secretary. Almost all of the material concerns electric lighting in the United States and Europe. Much of this correspondence relates to business dealings between Edison companies in the United States and Europe, particularly the purchase, manufacture, and shipment of dynamos, engines, and other electrical equipment for light companies in the United Kingdom and France. Other letters concern the canvassing of central station districts and the competition with gas companies in the United States. Among the recipients are Armington & Sims, Charles Batchelor, the Edison Electric Light Co., the Edison Electric Light Co., Ltd., Harris & Robinson, Edward H. Johnson, and the Société Electrique Edison. The cover is marked "1883." The spine is stamped "Edison Letters No.10." The book contains 495 numbered pages and an index. Pages 354-495 are blank. Approximately 30 percent of the book has been selected. Courtesy of Thomas Edison National Historical Park.