This letterbook covers the period December 1891-August 1892. 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, motors, batteries, lightning arresters, and transformers. In addition, there is correspondence concerning patent litigation involving Edison's electric power system. The spine is stamped "Letters." The book contains 499 numbered pages. Approximately 20 percent of the documents have been selected. Courtesy of Thomas Edison National Historical Park.