This letterbook covers the period August 1892-January 1894. The book contains correspondence, technical reports, and draft manuscripts by Arthur E. Kennelly. Included is material regarding a variety of electrical experiments, such as tests of meters, batteries, the carrying capacity of copper wire, and motors for sewing machines. In addition, there are items relating to plans for the Niagara Falls hydroelectric power system and letters concerning a review of several Westinghouse central stations for patent litigation by Edison General Electric Co. There is also a letter to Edison's private secretary Alfred O. Tate, as vice-president of the North American Phonograph Co., regarding Kennelly's examination of the Bettini phonograph. The spine is stamped "Letters." The book contains 700 numbered pages. Pages 418-700 are blank. The book is water damaged, and numerous pages are wrinkled and creased; the ink on most pages is smeared and/or faint. Approximately 20 percent of the documents have been selected. Courtesy of Thomas Edison National Historical Park.