This letterbook covers the period July 1888-July 1889. 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, telegraph cable, and non-magnetic watches. There are also items relating to electrocution experiments and the control of yellow fever. The spine is stamped "Letters." The book contains 496 numbered pages. Some pages have been removed from the book. Approximately 40 percent of the documents have been selected. Courtesy of Thomas Edison National Historical Park.