This letterbook covers the period May-December 1890 and June 1891. 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 cable for the electric railway. In addition, there are items relating to experiments with alternating current and electric lighting for the Lick Observatory in Hamilton, California. The book contains 500 numbered pages. Pages 440-500 are blank. Some pages have been removed from the book. The book is water damaged, and the ink on many pages is faded and smeared. Approximately 30 percent of the documents have been selected. Courtesy of Thomas Edison National Historical Park.