heat, light, and motive power had been underway for some time. The telegraph had been invented in 1845 and was in general use for communications by the time of the Civil War. The earliest electrical machinery had been produced in the eighteenth century, and Sir Humphrey Davy had succeeded in producing an electric light in 1809 Experiments in electric lighting and power continued throughout the middle of the nineteenth century but not until October, 1879 > was a commercially success ful electric lamp developed, one that would burn many hours and could be produced relatively cheaply. The feat was accomplished, of course, by Thomas A. Edison, who established the famous Peart Street generating station in New York in 1882 and achieved wealth and 20 fame in the electrical industry. A description of the subsequent expansion of the electrical industry as anything short of phenomenal would be a serious under statement. Tn 1906 almost 50 million electric lamps were sold in the United States; and that particular application of electricity represented but one part of the whole product of electrical and related industries. 29 Fred A. Shannon, The Centennial Years, A Political and Economic History of America from the Late 1870s to the Early 1890s. ed. by Robert Huhn Jones (Garden City,New York: Doubleday & Company, Inc., 1967), pp. 241-43.